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Changeset 13681

Timestamp:

May 6, 2010, 2:36:10 AM (10 years ago)

Author:

rme

Message:

Beta test version of asdf from upstream.
http://common-lisp.net/project/asdf/

File:

: 1 edited

trunk/source/tools/asdf.lisp (modified) (54 diffs)

Legend:

: Unmodified
: Added
: Removed

trunk/source/tools/asdf.lisp

-                      r13021
+                      r13681
 ;;; This is asdf: Another System Definition Facility.
 ;;; hash - $Format:%H$
+;;; -*- mode: common-lisp; package: asdf; -*-
+;;; This is ASDF: Another System Definition Facility.
 ;;;
+;;; Local Variables:
+;;; mode: lisp
+;;; End:
+;;;
+;;; Feedback, bug reports, and patches are all welcome: please mail to
+;;; <asdf-devel@common-lisp.net>.  But note first that the canonical
+;;; source for asdf is presently on common-lisp.net at
+;;; <URL:http://common-lisp.net/project/asdf/>
+;;; Feedback, bug reports, and patches are all welcome:
+;;; please mail to <asdf-devel@common-lisp.net>.
+;;; Note first that the canonical source for ASDF is presently
+;;; <URL:http://common-lisp.net/project/asdf/>.
 ;;;
 ;;; If you obtained this copy from anywhere else, and you experience
 …
 ;;; -- LICENSE START
 ;;; (This is the MIT / X Consortium license as taken from
+;;; (This is the MIT / X Consortium license as taken from
 ;;;  http://www.opensource.org/licenses/mit-license.html on or about
 ;;;  Monday; July 13, 2009)
 ;;;
 ;;; Copyright (c) 2001-2009 Daniel Barlow and contributors
+;;; Copyright (c) 2001-2010 Daniel Barlow and contributors
 ;;;
 ;;; Permission is hereby granted, free of charge, to any person obtaining
 …
 ;;; -- LICENSE END
 ;;; the problem with writing a defsystem replacement is bootstrapping:
 ;;; we can't use defsystem to compile it.  Hence, all in one file
+;;; The problem with writing a defsystem replacement is bootstrapping:
+;;; we can't use defsystem to compile it.  Hence, all in one file.
 #+xcvb (module ())
+(defpackage #:asdf
+  (:documentation "Another System Definition Facility")
+  (:export #:defsystem #:oos #:operate #:find-system #:run-shell-command
+           #:system-definition-pathname #:find-component ; miscellaneous
+           #:compile-system #:load-system #:test-system
+           #:compile-op #:load-op #:load-source-op
+           #:test-op
+           #:operation           ; operations
+           #:feature             ; sort-of operation
+           #:version             ; metaphorically sort-of an operation
+           #:input-files #:output-files #:perform ; operation methods
+           #:operation-done-p #:explain
+           #:component #:source-file
+           #:c-source-file #:cl-source-file #:java-source-file
+           #:static-file
+           #:doc-file
+           #:html-file
+           #:text-file
+           #:source-file-type
+           #:module                     ; components
+           #:system
+           #:unix-dso
+           #:module-components          ; component accessors
+           #:component-pathname
+           #:component-relative-pathname
+           #:component-name
+           #:component-version
+           #:component-parent
+           #:component-property
+           #:component-system
+           #:component-depends-on
+           #:system-description
+           #:system-long-description
+           #:system-author
+           #:system-maintainer
+           #:system-license
+           #:system-licence
+           #:system-source-file
+           #:system-relative-pathname
+           #:map-systems
+           #:operation-on-warnings
+           #:operation-on-failure
+                                        ;#:*component-parent-pathname*
+           #:*system-definition-search-functions*
+           #:*central-registry*         ; variables
+           #:*compile-file-warnings-behaviour*
+           #:*compile-file-failure-behaviour*
+           #:*asdf-revision*
+           #:*resolve-symlinks*
+           #:operation-error #:compile-failed #:compile-warned #:compile-error
+           #:error-component #:error-operation
+           #:system-definition-error
+           #:missing-component
+           #:missing-component-of-version
+           #:missing-dependency
+           #:missing-dependency-of-version
+           #:circular-dependency        ; errors
+           #:duplicate-names
+           #:try-recompiling
+           #:retry
+           #:accept                     ; restarts
+           #:coerce-entry-to-directory
+           #:remove-entry-from-registry
+           #:standard-asdf-method-combination
+           #:around                     ; protocol assistants
+           #:*source-to-target-mappings*
+           #:*default-toplevel-directory*
+           #:*centralize-lisp-binaries*
+           #:*include-per-user-information*
+           #:*map-all-source-files*
+           #:output-files-for-system-and-operation
+           #:*enable-asdf-binary-locations*
+           #:implementation-specific-directory-name)
+  (:use :cl))
+#+nil
+(error "The author of this file habitually uses #+nil to comment out ~
+        forms. But don't worry, it was unlikely to work in the New ~
+        Implementation of Lisp anyway")
+(in-package #:asdf)
+(defvar *asdf-revision*
+  ;; the 1+ hair is to ensure that we don't do an inadvertant find and replace
+  (subseq "REVISION:1.366" (1+ (length "REVISION"))))
+(cl:in-package :cl-user)
+(declaim (optimize (speed 2) (debug 2) (safety 3))
+         #+sbcl (sb-ext:muffle-conditions sb-ext:compiler-note))
+#+ecl (require :cmp)
+;;;; Create packages in a way that is compatible with hot-upgrade.
+;;;; See https://bugs.launchpad.net/asdf/+bug/485687
+;;;; See more at the end of the file.
+#+gcl
+(eval-when (:compile-toplevel :load-toplevel)
+  (defpackage :asdf-utilities (:use :cl))
+  (defpackage :asdf (:use :cl :asdf-utilities)))
+(eval-when (:load-toplevel :compile-toplevel :execute)
+  #+allegro
+  (setf excl::*autoload-package-name-alist*
+        (remove "asdf" excl::*autoload-package-name-alist*
+                :test 'equalp :key 'car))
+  (let* ((asdf-version
+          ;; the 1+ helps the version bumping script discriminate
+          (subseq "VERSION:1.717" (1+ (length "VERSION"))))
+         (existing-asdf (find-package :asdf))
+         (vername '#:*asdf-version*)
+         (versym (and existing-asdf
+                      (find-symbol (string vername) existing-asdf)))
+         (existing-version (and versym (boundp versym) (symbol-value versym)))
+         (already-there (equal asdf-version existing-version)))
+    (unless (and existing-asdf already-there)
+      #-gcl
+      (when existing-asdf
+        (format *error-output*
+                "~&Upgrading ASDF package ~@[from version ~A ~]to version ~A~%"
+                existing-version asdf-version))
+      (labels
+          ((rename-away (package)
+             (loop :with name = (package-name package)
+               :for i :from 1 :for new = (format nil "~A.~D" name i)
+               :unless (find-package new) :do
+               (rename-package-name package name new)))
+           (rename-package-name (package old new)
+             (let* ((old-names (cons (package-name package)
+                                     (package-nicknames package)))
+                    (new-names (subst new old old-names :test 'equal))
+                    (new-name (car new-names))
+                    (new-nicknames (cdr new-names)))
+               (rename-package package new-name new-nicknames)))
+           (ensure-exists (name nicknames use)
+             (let* ((previous
+                     (remove-duplicates
+                      (remove-if
+                       #'null
+                       (mapcar #'find-package (cons name nicknames)))
+                      :from-end t)))
+               (cond
+                 (previous
+                  ;; do away with packages with conflicting (nick)names
+                  (map () #'rename-away (cdr previous))
+                  ;; reuse previous package with same name
+                  (let ((p (car previous)))
+                    (rename-package p name nicknames)
+                    (ensure-use p use)
+                    p))
+                 (t
+                  (make-package name :nicknames nicknames :use use)))))
+           (find-sym (symbol package)
+             (find-symbol (string symbol) package))
+           (intern* (symbol package)
+             (intern (string symbol) package))
+           (remove-symbol (symbol package)
+             (let ((sym (find-sym symbol package)))
+               (when sym
+                 (unexport sym package)
+                 (unintern sym package))))
+           (ensure-unintern (package symbols)
+             (dolist (sym symbols) (remove-symbol sym package)))
+           (ensure-shadow (package symbols)
+             (shadow symbols package))
+           (ensure-use (package use)
+             (dolist (used (reverse use))
+               (do-external-symbols (sym used)
+                 (unless (eq sym (find-sym sym package))
+                   (remove-symbol sym package)))
+               (use-package used package)))
+           (ensure-fmakunbound (package symbols)
+             (loop :for name :in symbols
+               :for sym = (find-sym name package)
+               :when sym :do (fmakunbound sym)))
+           (ensure-export (package export)
+             (let ((syms (loop :for x :in export :collect
+                           (intern* x package))))
+               (do-external-symbols (sym package)
+                 (unless (member sym syms)
+                   (remove-symbol sym package)))
+               (dolist (sym syms)
+                 (export sym package))))
+           (ensure-package (name &key nicknames use unintern fmakunbound shadow export)
+             (let ((p (ensure-exists name nicknames use)))
+               (ensure-unintern p unintern)
+               (ensure-shadow p shadow)
+               (ensure-export p export)
+               (ensure-fmakunbound p fmakunbound)
+               p)))
+        (macrolet
+            ((pkgdcl (name &key nicknames use export
+                           redefined-functions unintern fmakunbound shadow)
+               `(ensure-package
+                 ',name :nicknames ',nicknames :use ',use :export ',export
+                 :shadow ',shadow
+                 :unintern ',(append #-(or gcl ecl) redefined-functions
+                                     unintern)
+                 :fmakunbound ',(append #+(or gcl ecl) redefined-functions
+                                        fmakunbound))))
+          (pkgdcl
+           :asdf-utilities
+           :nicknames (#:asdf-extensions)
+           :use (#:common-lisp)
+           :unintern (#:split #:make-collector)
+           :export
+           (#:absolute-pathname-p
+            #:aif
+            #:appendf
+            #:asdf-message
+            #:coerce-name
+            #:directory-pathname-p
+            #:ends-with
+            #:ensure-directory-pathname
+            #:getenv
+            #:get-uid
+            #:length=n-p
+            #:merge-pathnames*
+            #:pathname-directory-pathname
+            #:read-file-forms
+            #:remove-keys
+            #:remove-keyword
+            #:resolve-symlinks
+            #:split-string
+            #:component-name-to-pathname-components
+            #:split-name-type
+            #:system-registered-p
+            #:truenamize
+            #:while-collecting))
+          (pkgdcl
+           :asdf
+           :use (:common-lisp :asdf-utilities)
+           :redefined-functions
+           (#:perform #:explain #:output-files #:operation-done-p
+            #:perform-with-restarts #:component-relative-pathname
+            #:system-source-file #:operate #:find-component)
+           :unintern
+           (#:*asdf-revision* #:around #:asdf-method-combination
+            #:split #:make-collector)
+           :fmakunbound
+           (#:system-source-file
+            #:component-relative-pathname #:system-relative-pathname
+            #:process-source-registry
+            #:inherit-source-registry #:process-source-registry-directive)
+           :export
+           (#:defsystem #:oos #:operate #:find-system #:run-shell-command
+            #:system-definition-pathname #:find-component ; miscellaneous
+            #:compile-system #:load-system #:test-system
+            #:compile-op #:load-op #:load-source-op
+            #:test-op
+            #:operation               ; operations
+            #:feature                 ; sort-of operation
+            #:version                 ; metaphorically sort-of an operation
+            #:version-satisfies
+            #:input-files #:output-files #:perform ; operation methods
+            #:operation-done-p #:explain
+            #:component #:source-file
+            #:c-source-file #:cl-source-file #:java-source-file
+            #:static-file
+            #:doc-file
+            #:html-file
+            #:text-file
+            #:source-file-type
+            #:module                     ; components
+            #:system
+            #:unix-dso
+            #:module-components          ; component accessors
+            #:module-components-by-name  ; component accessors
+            #:component-pathname
+            #:component-relative-pathname
+            #:component-name
+            #:component-version
+            #:component-parent
+            #:component-property
+            #:component-system
+            #:component-depends-on
+            #:system-description
+            #:system-long-description
+            #:system-author
+            #:system-maintainer
+            #:system-license
+            #:system-licence
+            #:system-source-file
+            #:system-source-directory
+            #:system-relative-pathname
+            #:map-systems
+            #:operation-on-warnings
+            #:operation-on-failure
+            ;;#:*component-parent-pathname*
+            #:*system-definition-search-functions*
+            #:*central-registry*         ; variables
+            #:*compile-file-warnings-behaviour*
+            #:*compile-file-failure-behaviour*
+            #:*resolve-symlinks*
+            #:*asdf-verbose*
+            #:asdf-version
+            #:operation-error #:compile-failed #:compile-warned #:compile-error
+            #:error-name
+            #:error-pathname
+            #:load-system-definition-error
+            #:error-component #:error-operation
+            #:system-definition-error
+            #:missing-component
+            #:missing-component-of-version
+            #:missing-dependency
+            #:missing-dependency-of-version
+            #:circular-dependency        ; errors
+            #:duplicate-names
+            #:try-recompiling
+            #:retry
+            #:accept                     ; restarts
+            #:coerce-entry-to-directory
+            #:remove-entry-from-registry
+            #:initialize-output-translations
+            #:disable-output-translations
+            #:clear-output-translations
+            #:ensure-output-translations
+            #:apply-output-translations
+            #:compile-file-pathname*
+            #:enable-asdf-binary-locations-compatibility
+            #:*default-source-registries*
+            #:initialize-source-registry
+            #:compute-source-registry
+            #:clear-source-registry
+            #:ensure-source-registry
+            #:process-source-registry)))
+        (let* ((version (intern* vername :asdf))
+               (upvar (intern* '#:*upgraded-p* :asdf))
+               (upval0 (and (boundp upvar) (symbol-value upvar)))
+               (upval1 (if existing-version (cons existing-version upval0) upval0)))
+          (eval `(progn
+                   (defparameter ,version ,asdf-version)
+                   (defparameter ,upvar ',upval1))))))))
+(in-package :asdf)
+;; More cleanups in case of hot-upgrade. See https://bugs.launchpad.net/asdf/+bug/485687
+#+gcl
+(eval-when (:compile-toplevel :load-toplevel)
+  (defvar *asdf-version* nil)
+  (defvar *upgraded-p* nil))
+(when *upgraded-p*
+   #+ecl
+   (when (find-class 'compile-op nil)
+     (defmethod update-instance-for-redefined-class :after
+         ((c compile-op) added deleted plist &key)
+       (declare (ignore added deleted))
+       (let ((system-p (getf plist 'system-p)))
+         (when system-p (setf (getf (slot-value c 'flags) :system-p) system-p)))))
+   (when (find-class 'module nil)
+     (eval
+      '(defmethod update-instance-for-redefined-class :after
+           ((m module) added deleted plist &key)
+         (declare (ignorable deleted plist))
+         (when (member 'components-by-name added)
+           (compute-module-components-by-name m))))))
+;;;; -------------------------------------------------------------------------
+;;;; User-visible parameters
+;;;;
+(defun asdf-version ()
+  "Exported interface to the version of ASDF currently installed. A string.
+You can compare this string with e.g.:
+(ASDF:VERSION-SATISFIES (ASDF:ASDF-VERSION) \"1.704\")."
+  *asdf-version*)
 (defvar *resolve-symlinks* t
 …
 (defvar *verbose-out* nil)
+(defvar *asdf-verbose* t)
 (defparameter +asdf-methods+
+  '(perform explain output-files operation-done-p))
+(define-method-combination standard-asdf-method-combination ()
+  ((around-asdf (around))
+   (around (:around))
+   (before (:before))
+   (primary () :required t)
+   (after (:after)))
+  (flet ((call-methods (methods)
+           (mapcar #'(lambda (method)
+                       `(call-method ,method))
+                   methods)))
+    (let* ((form (if (or before after (rest primary))
+                     `(multiple-value-prog1
+                          (progn ,@(call-methods before)
+                                 (call-method ,(first primary)
+                                              ,(rest primary)))
+                        ,@(call-methods (reverse after)))
+                     `(call-method ,(first primary))))
+           (standard-form (if around
+                              `(call-method ,(first around)
+                                            (,@(rest around)
+                                               (make-method ,form)))
+                              form)))
+      (if around-asdf
+          `(call-method ,(first around-asdf)
+                        (,@(rest around-asdf) (make-method ,standard-form)))
+          standard-form))))
+(setf (documentation 'standard-asdf-method-combination
+                     'method-combination)
+      "This method combination is based on the standard method combination,
+but defines a new method-qualifier, `asdf:around`.  `asdf:around`
+methods will be run *around* any `:around` methods, so that the core
+protocol may employ around methods and those around methods will not
+be overridden by around methods added by a system developer.")
+(defgeneric perform (operation component)
+  (:method-combination standard-asdf-method-combination))
+(defgeneric operation-done-p (operation component)
+  (:method-combination standard-asdf-method-combination))
+(defgeneric explain (operation component)
+  (:method-combination standard-asdf-method-combination))
+(defgeneric output-files (operation component)
+  (:method-combination standard-asdf-method-combination))
+(defgeneric input-files (operation component)
+  (:method-combination standard-asdf-method-combination))
+  '(perform-with-restarts perform explain output-files operation-done-p))
+#+allegro
+(eval-when (:compile-toplevel :execute)
+  (defparameter *acl-warn-save*
+                (when (boundp 'excl:*warn-on-nested-reader-conditionals*)
+                  excl:*warn-on-nested-reader-conditionals*))
+  (when (boundp 'excl:*warn-on-nested-reader-conditionals*)
+    (setf excl:*warn-on-nested-reader-conditionals* nil)))
+;;;; -------------------------------------------------------------------------
+;;;; ASDF Interface, in terms of generic functions.
+(defgeneric perform-with-restarts (operation component))
+(defgeneric perform (operation component))
+(defgeneric operation-done-p (operation component))
+(defgeneric explain (operation component))
+(defgeneric output-files (operation component))
+(defgeneric input-files (operation component))
+(defgeneric component-operation-time (operation component))
 (defgeneric system-source-file (system)
 …
 (defgeneric component-relative-pathname (component)
+  (:documentation "Extracts the relative pathname applicable for a particular component."))
+  (:documentation "Returns a pathname for the component argument intended to be
+interpreted relative to the pathname of that component's parent.
+Despite the function's name, the return value may be an absolute
+pathname, because an absolute pathname may be interpreted relative to
+another pathname in a degenerate way."))
 (defgeneric component-property (component property))
 …
 (defgeneric version-satisfies (component version))
+(defgeneric find-component (module name &optional version)
+  (:documentation "Finds the component with name NAME present in the
+MODULE module; if MODULE is nil, then the component is assumed to be a
+system."))
+(defgeneric find-component (base path)
+  (:documentation "Finds the component with PATH starting from BASE module;
+if BASE is nil, then the component is assumed to be a system."))
 (defgeneric source-file-type (component system))
 …
 the head of the tree"))
+(defgeneric component-visited-p (operation component))
+(defgeneric visit-component (operation component data))
+(defgeneric component-visited-p (operation component)
+  (:documentation "Returns the value stored by a call to
+VISIT-COMPONENT, if that has been called, otherwise NIL.
+This value stored will be a cons cell, the first element
+of which is a computed key, so not interesting.  The
+CDR wil be the DATA value stored by VISIT-COMPONENT; recover
+it as (cdr (component-visited-p op c)).
+  In the current form of ASDF, the DATA value retrieved is
+effectively a boolean, indicating whether some operations are
+to be performed in order to do OPERATION X COMPONENT.  If the
+data value is NIL, the combination had been explored, but no
+operations needed to be performed."))
+(defgeneric visit-component (operation component data)
+  (:documentation "Record DATA as being associated with OPERATION
+and COMPONENT.  This is a side-effecting function:  the association
+will be recorded on the ROOT OPERATION \(OPERATION-ANCESTOR of the
+OPERATION\).
+  No evidence that DATA is ever interesting, beyond just being
+non-NIL.  Using the data field is probably very risky; if there is
+already a record for OPERATION X COMPONENT, DATA will be quietly
+discarded instead of recorded."))
 (defgeneric (setf visiting-component) (new-value operation component))
 …
 (defgeneric traverse (operation component)
   (:documentation
+  (:documentation
 "Generate and return a plan for performing `operation` on `component`.
 The plan returned is a list of dotted-pairs. Each pair is the `cons`
 of ASDF operation object and a `component` object. The pairs will be
+of ASDF operation object and a `component` object. The pairs will be
 processed in order by `operate`."))
+(defgeneric output-files-using-mappings (source possible-paths path-mappings)
+  (:documentation
+"Use the variable \\*source-to-target-mappings\\* to find
+an output path for the source. The algorithm transforms each
+entry in possible-paths as follows: If there is a mapping
+whose source starts with the path of possible-path, then
+replace possible-path with a pathname that starts with the
+target of the mapping and continues with the rest of
+possible-path. If no such mapping is found, then use the
+default mapping.
+If \\*centralize-lisp-binaries\\* is false, then the default
+mapping is to place the output in a subdirectory of the
+source. The subdirectory is named using the Lisp
+implementation \(see
+implementation-specific-directory-name\). If
+\\*centralize-lisp-binaries\\* is true, then the default
+mapping is to place the output in subdirectories of
+\\*default-toplevel-directory\\* where the subdirectory
+structure will mirror that of the source."))
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; utility stuff
+;;;; -------------------------------------------------------------------------
+;;;; General Purpose Utilities
+(defmacro while-collecting ((&rest collectors) &body body)
+  (let ((vars (mapcar #'(lambda (x) (gensym (symbol-name x))) collectors))
+        (initial-values (mapcar (constantly nil) collectors)))
+    `(let ,(mapcar #'list vars initial-values)
+       (flet ,(mapcar #'(lambda (c v) `(,c (x) (push x ,v) (values))) collectors vars)
+         ,@body
+         (values ,@(mapcar #'(lambda (v) `(reverse ,v)) vars))))))
 (defmacro aif (test then &optional else)
   `(let ((it ,test)) (if it ,then ,else)))
 (defun pathname-sans-name+type (pathname)
+(defun pathname-directory-pathname (pathname)
   "Returns a new pathname with same HOST, DEVICE, DIRECTORY as PATHNAME,
+and NIL NAME and TYPE components"
+  (make-pathname :name nil :type nil :defaults pathname))
+and NIL NAME, TYPE and VERSION components"
+  (make-pathname :name nil :type nil :version nil :defaults pathname))
+(defun current-directory ()
+  (truenamize (pathname-directory-pathname *default-pathname-defaults*)))
+(defun merge-pathnames* (specified &optional (defaults *default-pathname-defaults*))
+  "MERGE-PATHNAMES* is like MERGE-PATHNAMES except that if the SPECIFIED pathname
+does not have an absolute directory, then the HOST and DEVICE come from the DEFAULTS.
+Also, if either argument is NIL, then the other argument is returned unmodified."
+  (when (null specified) (return-from merge-pathnames* defaults))
+  (when (null defaults) (return-from merge-pathnames* specified))
+  (let* ((specified (pathname specified))
+         (defaults (pathname defaults))
+         (directory (pathname-directory specified))
+         (directory (if (stringp directory) `(:absolute ,directory) directory))
+         (name (or (pathname-name specified) (pathname-name defaults)))
+         (type (or (pathname-type specified) (pathname-type defaults)))
+         (version (or (pathname-version specified) (pathname-version defaults))))
+    (labels ((ununspecific (x)
+               (if (eq x :unspecific) nil x))
+             (unspecific-handler (p)
+               (if (typep p 'logical-pathname) #'ununspecific #'identity)))
+      (multiple-value-bind (host device directory unspecific-handler)
+          (#-gcl ecase #+gcl case (first directory)
+            ((nil)
+             (values (pathname-host defaults)
+                     (pathname-device defaults)
+                     (pathname-directory defaults)
+                     (unspecific-handler defaults)))
+            ((:absolute)
+             (values (pathname-host specified)
+                     (pathname-device specified)
+                     directory
+                     (unspecific-handler specified)))
+            ((:relative)
+             (values (pathname-host defaults)
+                     (pathname-device defaults)
+                     (append (pathname-directory defaults) (cdr directory))
+                     (unspecific-handler defaults)))
+            #+gcl
+            (t
+             (assert (stringp (first directory)))
+             (values (pathname-host defaults)
+                     (pathname-device defaults)
+                     (append (pathname-directory defaults) directory)
+                     (unspecific-handler defaults))))
+        (make-pathname :host host :device device :directory directory
+                       :name (funcall unspecific-handler name)
+                       :type (funcall unspecific-handler type)
+                       :version (funcall unspecific-handler version))))))
 (define-modify-macro appendf (&rest args)
+  append "Append onto list")
+  append "Append onto list") ;; only to be used on short lists.
+(define-modify-macro orf (&rest args)
+  or "or a flag")
 (defun asdf-message (format-string &rest format-args)
 …
   (apply #'format *verbose-out* format-string format-args))
+(defun split-path-string (s &optional force-directory)
+(defun split-string (string &key max (separator '(#\Space #\Tab)))
+  "Split STRING in components separater by any of the characters in the sequence SEPARATOR,
+return a list.
+If MAX is specified, then no more than max(1,MAX) components will be returned,
+starting the separation from the end, e.g. when called with arguments
+ \"a.b.c.d.e\" :max 3 :separator \".\" it will return (\"a.b.c\" \"d\" \"e\")."
+  (block nil
+    (let ((list nil) (words 0) (end (length string)))
+      (flet ((separatorp (char) (find char separator))
+             (done () (return (cons (subseq string 0 end) list))))
+        (loop
+          :for start = (if (and max (>= words (1- max)))
+                           (done)
+                           (position-if #'separatorp string :end end :from-end t)) :do
+          (when (null start)
+            (done))
+          (push (subseq string (1+ start) end) list)
+          (incf words)
+          (setf end start))))))
+(defun split-name-type (filename)
+  (let ((unspecific
+         ;; Giving :unspecific as argument to make-pathname is not portable.
+         ;; See CLHS make-pathname and 19.2.2.2.3.
+         ;; We only use it on implementations that support it.
+         (or #+(or ccl ecl gcl lispworks sbcl) :unspecific)))
+    (destructuring-bind (name &optional (type unspecific))
+        (split-string filename :max 2 :separator ".")
+      (if (equal name "")
+          (values filename unspecific)
+          (values name type)))))
+(defun component-name-to-pathname-components (s &optional force-directory)
+  "Splits the path string S, returning three values:
+A flag that is either :absolute or :relative, indicating
+   how the rest of the values are to be interpreted.
+A directory path --- a list of strings, suitable for
+   use with MAKE-PATHNAME when prepended with the flag
+   value.
+A filename with type extension, possibly NIL in the
+   case of a directory pathname.
+FORCE-DIRECTORY forces S to be interpreted as a directory
+pathname \(third return value will be NIL, final component
+of S will be treated as part of the directory path.
+The intention of this function is to support structured component names,
+e.g., \(:file \"foo/bar\"\), which will be unpacked to relative
+pathnames."
   (check-type s string)
   (let* ((components (split s nil "/"))
+  (let* ((components (split-string s :separator "/"))
          (last-comp (car (last components))))
     (multiple-value-bind (relative components)
         (if (equal (first components) "")
+          (values :absolute (cdr components))
+            (if (and (plusp (length s)) (eql (char s 0) #\/))
+                (values :absolute (cdr components))
+                (values :relative nil))
           (values :relative components))
       (cond
 …
          (values relative (butlast components) last-comp))))))
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; classes, condiitons
+(defun remove-keys (key-names args)
+  (loop :for (name val) :on args :by #'cddr
+    :unless (member (symbol-name name) key-names
+                    :key #'symbol-name :test 'equal)
+    :append (list name val)))
+(defun remove-keyword (key args)
+  (loop :for (k v) :on args :by #'cddr
+    :unless (eq k key)
+    :append (list k v)))
+(defun resolve-symlinks (path)
+  #-allegro (truenamize path)
+  #+allegro (excl:pathname-resolve-symbolic-links path))
+(defun getenv (x)
+  #+abcl
+  (ext:getenv x)
+  #+sbcl
+  (sb-ext:posix-getenv x)
+  #+clozure
+  (ccl::getenv x)
+  #+clisp
+  (ext:getenv x)
+  #+cmu
+  (cdr (assoc (intern x :keyword) ext:*environment-list*))
+  #+lispworks
+  (lispworks:environment-variable x)
+  #+allegro
+  (sys:getenv x)
+  #+gcl
+  (system:getenv x)
+  #+ecl
+  (si:getenv x))
+(defun directory-pathname-p (pathname)
+  "Does `pathname` represent a directory?
+A directory-pathname is a pathname _without_ a filename. The three
+ways that the filename components can be missing are for it to be `nil`,
+`:unspecific` or the empty string.
+Note that this does _not_ check to see that `pathname` points to an
+actually-existing directory."
+  (flet ((check-one (x)
+           (member x '(nil :unspecific "") :test 'equal)))
+    (and (check-one (pathname-name pathname))
+         (check-one (pathname-type pathname))
+         t)))
+(defun ensure-directory-pathname (pathspec)
+  "Converts the non-wild pathname designator PATHSPEC to directory form."
+  (cond
+   ((stringp pathspec)
+    (ensure-directory-pathname (pathname pathspec)))
+   ((not (pathnamep pathspec))
+    (error "Invalid pathname designator ~S" pathspec))
+   ((wild-pathname-p pathspec)
+    (error "Can't reliably convert wild pathnames."))
+   ((directory-pathname-p pathspec)
+    pathspec)
+   (t
+    (make-pathname :directory (append (or (pathname-directory pathspec)
+                                          (list :relative))
+                                      (list (file-namestring pathspec)))
+                   :name nil :type nil :version nil
+                   :defaults pathspec))))
+(defun absolute-pathname-p (pathspec)
+  (eq :absolute (car (pathname-directory (pathname pathspec)))))
+(defun length=n-p (x n) ;is it that (= (length x) n) ?
+  (check-type n (integer 0 *))
+  (loop
+    :for l = x :then (cdr l)
+    :for i :downfrom n :do
+    (cond
+      ((zerop i) (return (null l)))
+      ((not (consp l)) (return nil)))))
+(defun ends-with (s suffix)
+  (check-type s string)
+  (check-type suffix string)
+  (let ((start (- (length s) (length suffix))))
+    (and (<= 0 start)
+         (string-equal s suffix :start1 start))))
+(defun read-file-forms (file)
+  (with-open-file (in file)
+    (loop :with eof = (list nil)
+     :for form = (read in nil eof)
+     :until (eq form eof)
+     :collect form)))
+#-(and (or win32 windows mswindows mingw32) (not cygwin))
+(progn
+#+clisp (defun get-uid () (posix:uid))
+#+sbcl (defun get-uid () (sb-unix:unix-getuid))
+#+cmu (defun get-uid () (unix:unix-getuid))
+#+ecl (ffi:clines "#include <sys/types.h>" "#include <unistd.h>")
+#+ecl (defun get-uid () (ffi:c-inline () () :int "getuid()" :one-liner t))
+#+allegro (defun get-uid () (excl.osi:getuid))
+#-(or cmu sbcl clisp allegro ecl)
+(defun get-uid ()
+  (let ((uid-string
+         (with-output-to-string (*verbose-out*)
+           (run-shell-command "id -ur"))))
+    (with-input-from-string (stream uid-string)
+      (read-line stream)
+      (handler-case (parse-integer (read-line stream))
+        (error () (error "Unable to find out user ID")))))))
+(defun pathname-root (pathname)
+  (make-pathname :host (pathname-host pathname)
+                 :device (pathname-device pathname)
+                 :directory '(:absolute)
+                 :name nil :type nil :version nil))
+(defun truenamize (p)
+  "Resolve as much of a pathname as possible"
+  (block nil
+    (when (typep p 'logical-pathname) (return p))
+    (let* ((p (merge-pathnames* p))
+           (directory (pathname-directory p)))
+      (when (typep p 'logical-pathname) (return p))
+      (ignore-errors (return (truename p)))
+      (when (stringp directory)
+         (return p))
+      (when (not (eq :absolute (car directory)))
+        (return p))
+      (let ((sofar (ignore-errors (truename (pathname-root p)))))
+        (unless sofar (return p))
+        (flet ((solution (directories)
+                 (merge-pathnames*
+                  (make-pathname :host nil :device nil
+                                 :directory `(:relative ,@directories)
+                                 :name (pathname-name p)
+                                 :type (pathname-type p)
+                                 :version (pathname-version p))
+                  sofar)))
+          (loop :for component :in (cdr directory)
+            :for rest :on (cdr directory)
+            :for more = (ignore-errors
+                          (truename
+                           (merge-pathnames*
+                            (make-pathname :directory `(:relative ,component))
+                            sofar))) :do
+            (if more
+                (setf sofar more)
+                (return (solution rest)))
+            :finally
+            (return (solution nil))))))))
+(defun lispize-pathname (input-file)
+  (make-pathname :type "lisp" :defaults input-file))
+;;;; -------------------------------------------------------------------------
+;;;; Classes, Conditions
 (define-condition system-definition-error (error) ()
 …
              (apply #'format s (format-control c) (format-arguments c)))))
+(define-condition load-system-definition-error (system-definition-error)
+  ((name :initarg :name :reader error-name)
+   (pathname :initarg :pathname :reader error-pathname)
+   (condition :initarg :condition :reader error-condition))
+  (:report (lambda (c s)
+             (format s "~@<Error while trying to load definition for system ~A from pathname ~A: ~A~@:>"
+                     (error-name c) (error-pathname c) (error-condition c)))))
 (define-condition circular-dependency (system-definition-error)
   ((components :initarg :components :reader circular-dependency-components)))
 (define-condition duplicate-names (system-definition-error)
+  ((name :initarg :name :reader duplicate-names-name)))
+  ((name :initarg :name :reader duplicate-names-name))
+  (:report (lambda (c s)
+             (format s "~@<Error while defining system: multiple components are given same name ~A~@:>"
+                     (duplicate-names-name c)))))
 (define-condition missing-component (system-definition-error)
 …
 (define-condition missing-dependency-of-version (missing-dependency
                                                  missing-component-of-version)
+                                                 missing-component-of-version)
   ())
 …
          "Component name: designator for a string composed of portable pathname characters")
    (version :accessor component-version :initarg :version)
+   (in-order-to :initform nil :initarg :in-order-to)
+   ;; XXX crap name
+   (do-first :initform nil :initarg :do-first)
+   (in-order-to :initform nil :initarg :in-order-to
+                :accessor component-in-order-to)
+   ;; This one is used by POIU. Maybe in the future by ASDF instead of in-order-to?
+   (load-dependencies :accessor component-load-dependencies :initform nil)
+   ;; XXX crap name, but it's an official API name!
+   (do-first :initform nil :initarg :do-first
+             :accessor component-do-first)
    ;; methods defined using the "inline" style inside a defsystem form:
    ;; need to store them somewhere so we can delete them when the system
 …
    ;; it to default in funky ways if not supplied
    (relative-pathname :initarg :pathname)
+   (operation-times :initform (make-hash-table )
+   (absolute-pathname)
+   (operation-times :initform (make-hash-table)
                     :accessor component-operation-times)
    ;; XXX we should provide some atomic interface for updating the
 …
                :initform nil)))
+(defun component-find-path (component)
+  (reverse
+   (loop :for c = component :then (component-parent c)
+     :while c :collect (component-name c))))
+(defmethod print-object ((c component) stream)
+  (print-unreadable-object (c stream :type t :identity nil)
+    (format stream "~@<~{~S~^ ~}~@:>" (component-find-path c))))
 ;;;; methods: conditions
 …
 (defun sysdef-error (format &rest arguments)
   (error 'formatted-system-definition-error :format-control
          format :format-arguments arguments))
+  (error 'formatted-system-definition-error :format-control
+         format :format-arguments arguments))
 ;;;; methods: components
 …
            (missing-requires c)
            (missing-version c)
            (when (missing-parent c)
              (component-name (missing-parent c)))))
+           (when (missing-parent c)
+             (component-name (missing-parent c)))))
 (defmethod component-system ((component component))
 …
        component))
+(defmethod print-object ((c component) stream)
+  (print-unreadable-object (c stream :type t :identity t)
+    (ignore-errors
+      (prin1 (component-name c) stream))))
+(defvar *default-component-class* 'cl-source-file)
+(defun compute-module-components-by-name (module)
+  (let ((hash (module-components-by-name module)))
+    (clrhash hash)
+    (loop :for c :in (module-components module)
+      :for name = (component-name c)
+      :for previous = (gethash name (module-components-by-name module))
+      :do
+      (when previous
+        (error 'duplicate-names :name name))
+      :do (setf (gethash name (module-components-by-name module)) c))
+    hash))
 (defclass module (component)
+  ((components :initform nil :accessor module-components :initarg :components)
+   ;; what to do if we can't satisfy a dependency of one of this module's
+   ;; components.  This allows a limited form of conditional processing
+   (if-component-dep-fails :initform :fail
+                           :accessor module-if-component-dep-fails
+                           :initarg :if-component-dep-fails)
+   (default-component-class :accessor module-default-component-class
+     :initform 'cl-source-file :initarg :default-component-class)))
+  ((components
+    :initform nil
+    :initarg :components
+    :accessor module-components)
+   (components-by-name
+    :initform (make-hash-table :test 'equal)
+    :accessor module-components-by-name)
+   ;; What to do if we can't satisfy a dependency of one of this module's
+   ;; components.  This allows a limited form of conditional processing.
+   (if-component-dep-fails
+    :initform :fail
+    :initarg :if-component-dep-fails
+    :accessor module-if-component-dep-fails)
+   (default-component-class
+    :initform *default-component-class*
+    :initarg :default-component-class
+    :accessor module-default-component-class)))
 (defun component-parent-pathname (component)
+  (aif (component-parent component)
+       (component-pathname it)
+       *default-pathname-defaults*))
+(defmethod component-relative-pathname ((component module))
+  (or (slot-value component 'relative-pathname)
+      (multiple-value-bind (relative path)
+          (split-path-string (component-name component) t)
+        (make-pathname
+         :directory `(,relative ,@path)
+         :host (pathname-host (component-parent-pathname component))))))
+  ;; No default anymore (in particular, no *default-pathname-defaults*).
+  ;; If you force component to have a NULL pathname, you better arrange
+  ;; for any of its children to explicitly provide a proper absolute pathname
+  ;; wherever a pathname is actually wanted.
+  (let ((parent (component-parent component)))
+    (when parent
+      (component-pathname parent))))
 (defmethod component-pathname ((component component))
+  (let ((*default-pathname-defaults* (component-parent-pathname component)))
+    (merge-pathnames (component-relative-pathname component))))
+  (if (slot-boundp component 'absolute-pathname)
+      (slot-value component 'absolute-pathname)
+      (let ((pathname
+             (merge-pathnames*
+             (component-relative-pathname component)
+             (component-parent-pathname component))))
+        (unless (or (null pathname) (absolute-pathname-p pathname))
+          (error "Invalid relative pathname ~S for component ~S" pathname component))
+        (setf (slot-value component 'absolute-pathname) pathname)
+        pathname)))
 (defmethod component-property ((c component) property)
 …
         (setf (cdr a) new-value)
         (setf (slot-value c 'properties)
+              (acons property new-value (slot-value c 'properties))))))
+              (acons property new-value (slot-value c 'properties)))))
+  new-value)
 (defclass system (module)
 …
             :accessor system-license :initarg :license)
    (source-file :reader system-source-file :initarg :source-file
+                :writer %set-system-source-file)))
+;;; version-satisfies
+;;; with apologies to christophe rhodes ...
+(defun split (string &optional max (ws '(#\Space #\Tab)))
+  (flet ((is-ws (char) (find char ws)))
+    (nreverse
+     (let ((list nil) (start 0) (words 0) end)
+       (loop
+         (when (and max (>= words (1- max)))
+           (return (cons (subseq string start) list)))
+         (setf end (position-if #'is-ws string :start start))
+         (push (subseq string start end) list)
+         (incf words)
+         (unless end (return list))
+         (setf start (1+ end)))))))
+                :writer %set-system-source-file)))
+;;;; -------------------------------------------------------------------------
+;;;; version-satisfies
 (defmethod version-satisfies ((c component) version)
   (unless (and version (slot-boundp c 'version))
     (return-from version-satisfies t))
+  (version-satisfies (component-version c) version))
+(defmethod version-satisfies ((cver string) version)
   (let ((x (mapcar #'parse-integer
                    (split (component-version c) nil '(#\.))))
+                   (split-string cver :separator ".")))
         (y (mapcar #'parse-integer
                    (split version nil '(#\.)))))
+                   (split-string version :separator "."))))
     (labels ((bigger (x y)
                (cond ((not y) t)
 …
            (or (not (cdr y)) (bigger (cdr x) (cdr y)))))))
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;; finding systems
+;;;; -------------------------------------------------------------------------
+;;;; Finding systems
 (defun make-defined-systems-table ()
   (make-hash-table :test 'equal))
+(defvar *defined-systems* (make-defined-systems-table))
+(defvar *defined-systems* (make-defined-systems-table)
+  "This is a hash table whose keys are strings, being the
+names of the systems, and whose values are pairs, the first
+element of which is a universal-time indicating when the
+system definition was last updated, and the second element
+of which is a system object.")
 (defun coerce-name (name)
 …
 called with an object of type asdf:system."
   (maphash (lambda (_ datum)
              (declare (ignore _))
              (destructuring-bind (_ . def) datum
                (declare (ignore _))
                (funcall fn def)))
            *defined-systems*))
+             (declare (ignore _))
+             (destructuring-bind (_ . def) datum
+               (declare (ignore _))
+               (funcall fn def)))
+           *defined-systems*))
 ;;; for the sake of keeping things reasonably neat, we adopt a
 ;;; convention that functions in this list are prefixed SYSDEF-
 (defvar *system-definition-search-functions*
   '(sysdef-central-registry-search))
+(defparameter *system-definition-search-functions*
+  '(sysdef-central-registry-search sysdef-source-registry-search))
 (defun system-definition-pathname (system)
 …
     (or
      (some (lambda (x) (funcall x system-name))
            *system-definition-search-functions*)
+           *system-definition-search-functions*)
      (let ((system-pair (system-registered-p system-name)))
        (and system-pair
+            (system-source-file (cdr system-pair)))))))
+(defvar *central-registry*
+  `((directory-namestring *default-pathname-defaults*))
+            (system-source-file (cdr system-pair)))))))
+(defvar *central-registry* nil
 "A list of 'system directory designators' ASDF uses to find systems.
 A 'system directory designator' is a pathname or a function
+A 'system directory designator' is a pathname or an expression
 which evaluates to a pathname. For example:
 …
                 #p\"/home/me/cl/systems/\"
                 #p\"/usr/share/common-lisp/systems/\"))
+This is for backward compatibilily.
+Going forward, we recommend new users should be using the source-registry.
 ")
-(defun directory-pathname-p (pathname)
-  "Does `pathname` represent a directory?
-A directory-pathname is a pathname _without_ a filename. The three
-ways that the filename components can be missing are for it to be `nil`,
-`:unspecific` or the empty string.
-Note that this does _not_ check to see that `pathname` points to an
-actually-existing directory."
-  (flet ((check-one (x)
-           (not (null (member x '(nil :unspecific "")
-                              :test 'equal)))))
-    (and (check-one (pathname-name pathname))
-         (check-one (pathname-type pathname)))))
-#+(or)
-;;test
-;;?? move into testsuite sometime soon
-(every (lambda (p)
-          (directory-pathname-p p))
-        (list
-         (make-pathname :name "." :type nil :directory '(:absolute "tmp"))
-         (make-pathname :name "." :type "" :directory '(:absolute "tmp"))
-         (make-pathname :name nil :type "" :directory '(:absolute "tmp"))
-         (make-pathname :name "" :directory '(:absolute "tmp"))
-         (make-pathname :type :unspecific :directory '(:absolute "tmp"))
-         (make-pathname :name :unspecific :directory '(:absolute "tmp"))
-         (make-pathname :name :unspecific :directory '(:absolute "tmp"))
-         (make-pathname :type "" :directory '(:absolute "tmp"))
-         ))
-(defun ensure-directory-pathname (pathname)
-  (if (directory-pathname-p pathname)
-      pathname
-      (make-pathname :defaults pathname
-                     :directory (append
-                                 (pathname-directory pathname)
-                                 (list (file-namestring pathname)))
-                     :name nil :type nil :version nil)))
 (defun sysdef-central-registry-search (system)
   (let ((name (coerce-name system))
         (to-remove nil)
         (to-replace nil))
+        (to-remove nil)
+        (to-replace nil))
     (block nil
       (unwind-protect
+           (dolist (dir *central-registry*)
+             (let ((defaults (eval dir)))
+               (when defaults
+                 (cond ((directory-pathname-p defaults)
+                        (let ((file (and defaults
+                                         (make-pathname
+                                          :defaults defaults :version :newest
+                                          :name name :type "asd" :case :local)))
+                               #+(and (or win32 windows) (not :clisp))
+                               (shortcut (make-pathname
+                                          :defaults defaults :version :newest
+                                          :name name :type "asd.lnk" :case :local)))
+                          (if (and file (probe-file file))
+                              (return file))
+                          #+(and (or win32 windows) (not :clisp))
+                          (when (probe-file shortcut)
+                            (let ((target (parse-windows-shortcut shortcut)))
+                              (when target
+                                (return (pathname target)))))))
+                       (t
+                        (restart-case
+                            (let* ((*print-circle* nil)
+                                   (message
+                                    (format nil
+                                            "~@<While searching for system `~a`: `~a` evaluated ~
+to `~a` which is not a directory.~@:>"
+                                            system dir defaults)))
+                              (error message))
+                          (remove-entry-from-registry ()
+                            :report "Remove entry from *central-registry* and continue"
+                            (push dir to-remove))
+                          (coerce-entry-to-directory ()
+                            :report (lambda (s)
+                                      (format s "Coerce entry to ~a, replace ~a and continue."
+                                              (ensure-directory-pathname defaults) dir))
+                            (push (cons dir (ensure-directory-pathname defaults)) to-replace))))))))
+        ;; cleanup
+        (dolist (dir to-remove)
+          (setf *central-registry* (remove dir *central-registry*)))
+        (dolist (pair to-replace)
+          (let* ((current (car pair))
+                 (new (cdr pair))
+                 (position (position current *central-registry*)))
+            (setf *central-registry*
+                  (append (subseq *central-registry* 0 position)
+                          (list new)
+                          (subseq *central-registry* (1+ position))))))))))
+           (dolist (dir *central-registry*)
+             (let ((defaults (eval dir)))
+               (when defaults
+                 (cond ((directory-pathname-p defaults)
+                        (let ((file (probe-asd name defaults)))
+                          (when file
+                            (return file))))
+                       (t
+                        (restart-case
+                            (let* ((*print-circle* nil)
+                                   (message
+                                    (format nil
+                                            "~@<While searching for system `~a`: `~a` evaluated ~
+to `~a` which is not a directory.~@:>"
+                                            system dir defaults)))
+                              (error message))
+                          (remove-entry-from-registry ()
+                            :report "Remove entry from *central-registry* and continue"
+                            (push dir to-remove))
+                          (coerce-entry-to-directory ()
+                            :report (lambda (s)
+                                      (format s "Coerce entry to ~a, replace ~a and continue."
+                                              (ensure-directory-pathname defaults) dir))
+                            (push (cons dir (ensure-directory-pathname defaults)) to-replace))))))))
+        ;; cleanup
+        (dolist (dir to-remove)
+          (setf *central-registry* (remove dir *central-registry*)))
+        (dolist (pair to-replace)
+          (let* ((current (car pair))
+                 (new (cdr pair))
+                 (position (position current *central-registry*)))
+            (setf *central-registry*
+                  (append (subseq *central-registry* 0 position)
+                          (list new)
+                          (subseq *central-registry* (1+ position))))))))))
 (defun make-temporary-package ()
   (flet ((try (counter)
            (ignore-errors
              (make-package (format nil "~a~D" 'asdf counter)
+             (make-package (format nil "~A~D" :asdf counter)
                            :use '(:cl :asdf)))))
     (do* ((counter 0 (+ counter 1))
           (package (try counter) (try counter)))
          (package package))))
+(defun safe-file-write-date (pathname)
+  ;; If FILE-WRITE-DATE returns NIL, it's possible that
+  ;; the user or some other agent has deleted an input file.
+  ;; Also, generated files will not exist at the time planning is done
+  ;; and calls operation-done-p which calls safe-file-write-date.
+  ;; So it is very possible that we can't get a valid file-write-date,
+  ;; and we can survive and we will continue the planning
+  ;; as if the file were very old.
+  ;; (or should we treat the case in a different, special way?)
+  (or (and pathname (probe-file pathname) (file-write-date pathname))
+      (progn
+        (when pathname
+          (warn "Missing FILE-WRITE-DATE for ~S: treating it as zero."
+                pathname))
+)))
 (defun find-system (name &optional (error-p t))
 …
     (when (and on-disk
                (or (not in-memory)
                    (< (car in-memory) (file-write-date on-disk))))
+                   (< (car in-memory) (safe-file-write-date on-disk))))
       (let ((package (make-temporary-package)))
         (unwind-protect
+             (let ((*package* package))
+               (asdf-message
+                "~&~@<; ~@;loading system definition from ~A into ~A~@:>~%"
+                ;; FIXME: This wants to be (ENOUGH-NAMESTRING
+                ;; ON-DISK), but CMUCL barfs on that.
+                on-disk
+                *package*)
+               (load on-disk))
+             (handler-bind
+                 ((error (lambda (condition)
+                           (error 'load-system-definition-error
+                                  :name name :pathname on-disk
+                                  :condition condition))))
+               (let ((*package* package))
+                 (asdf-message
+                  "~&~@<; ~@;loading system definition from ~A into ~A~@:>~%"
+                  on-disk *package*)
+                 (load on-disk)))
           (delete-package package))))
     (let ((in-memory (system-registered-p name)))
       (if in-memory
+          (progn (if on-disk (setf (car in-memory) (file-write-date on-disk)))
+          (progn (when on-disk (setf (car in-memory)
+                                     (safe-file-write-date on-disk)))
                  (cdr in-memory))
           (if error-p (error 'missing-component :requires name))))))
+          (when error-p (error 'missing-component :requires name))))))
 (defun register-system (name system)
 …
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; finding components
+(defmethod find-component ((module module) name &optional version)
+  (if (slot-boundp module 'components)
+      (let ((m (find name (module-components module)
+                     :test #'equal :key #'component-name)))
+        (if (and m (version-satisfies m version)) m))))
+;;; a component with no parent is a system
+(defmethod find-component ((module (eql nil)) name &optional version)
+  (let ((m (find-system name nil)))
+    (if (and m (version-satisfies m version)) m)))
+;;;; -------------------------------------------------------------------------
+;;;; Finding components
+(defmethod find-component ((base string) path)
+  (let ((s (find-system base nil)))
+    (and s (find-component s path))))
+(defmethod find-component ((base symbol) path)
+  (cond
+    (base (find-component (coerce-name base) path))
+    (path (find-component path nil))
+    (t    nil)))
+(defmethod find-component ((base cons) path)
+  (find-component (car base) (cons (cdr base) path)))
+(defmethod find-component ((module module) (name string))
+  (when (slot-boundp module 'components-by-name)
+    (values (gethash name (module-components-by-name module)))))
+(defmethod find-component ((component component) (name symbol))
+  (if name
+      (find-component component (string name))
+      component))
+(defmethod find-component ((module module) (name cons))
+  (find-component (find-component module (car name)) (cdr name)))
 ;;; component subclasses
+(defclass source-file (component) ())
+(defclass cl-source-file (source-file) ())
+(defclass c-source-file (source-file) ())
+(defclass java-source-file (source-file) ())
+(defclass source-file (component)
+  ((type :accessor source-file-explicit-type :initarg :type :initform nil)))
+(defclass cl-source-file (source-file)
+  ((type :initform "lisp")))
+(defclass c-source-file (source-file)
+  ((type :initform "c")))
+(defclass java-source-file (source-file)
+  ((type :initform "java")))
 (defclass static-file (source-file) ())
 (defclass doc-file (static-file) ())
+(defclass html-file (doc-file) ())
+(defmethod source-file-type ((c cl-source-file) (s module)) "lisp")
+(defmethod source-file-type ((c c-source-file) (s module)) "c")
+(defmethod source-file-type ((c java-source-file) (s module)) "java")
+(defmethod source-file-type ((c html-file) (s module)) "html")
+(defmethod source-file-type ((c static-file) (s module)) nil)
+(defmethod component-relative-pathname ((component source-file))
+  (multiple-value-bind (relative path name)
+      (split-path-string (component-name component))
+    (let ((type (source-file-type component (component-system component)))
+          (relative-pathname (slot-value component 'relative-pathname))
+          (*default-pathname-defaults* (component-parent-pathname component)))
+      (if relative-pathname
+        (merge-pathnames
+         relative-pathname
+         (if type
+           (make-pathname :name name :type type)
+           name))
+        (make-pathname :directory `(,relative ,@path) :name name :type type)))))
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; operations
+;;; one of these is instantiated whenever (operate ) is called
+(defclass html-file (doc-file)
+  ((type :initform "html")))
+(defmethod source-file-type ((component module) (s module))
+  (declare (ignorable component s))
+  :directory)
+(defmethod source-file-type ((component source-file) (s module))
+  (declare (ignorable s))
+  (source-file-explicit-type component))
+(defun merge-component-name-type (name &key type defaults)
+  ;; The defaults are required notably because they provide the default host
+  ;; to the below make-pathname, which may crucially matter to people using
+  ;; merge-pathnames with non-default hosts,  e.g. for logical-pathnames.
+  ;; NOTE that the host and device slots will be taken from the defaults,
+  ;; but that should only matter if you either (a) use absolute pathnames, or
+  ;; (b) later merge relative pathnames with CL:MERGE-PATHNAMES instead of
+  ;; ASDF-UTILITIES:MERGE-PATHNAMES*
+  (etypecase name
+    (pathname
+     name)
+    (symbol
+     (merge-component-name-type (string-downcase name) :type type :defaults defaults))
+    (string
+     (multiple-value-bind (relative path filename)
+         (component-name-to-pathname-components name (eq type :directory))
+       (multiple-value-bind (name type)
+           (cond
+             ((or (eq type :directory) (null filename))
+              (values nil nil))
+             (type
+              (values filename type))
+             (t
+              (split-name-type filename)))
+         (let* ((defaults (pathname (or defaults *default-pathname-defaults*)))
+                (host (pathname-host defaults))
+                (device (pathname-device defaults)))
+           (make-pathname :directory `(,relative ,@path)
+                          :name name :type type
+                          :host host :device device)))))))
+(defmethod component-relative-pathname ((component component))
+  (merge-component-name-type
+   (or (slot-value component 'relative-pathname)
+       (component-name component))
+   :type (source-file-type component (component-system component))
+   :defaults (component-parent-pathname component)))
+;;;; -------------------------------------------------------------------------
+;;;; Operations
+;;; one of these is instantiated whenever #'operate is called
 (defclass operation ()
+  ((forced :initform nil :initarg :force :accessor operation-forced)
+  (
+   ;; as of danb's 2003-03-16 commit e0d02781, :force can be:
+   ;; T to force the inside of existing system,
+   ;;   but not recurse to other systems we depend on.
+   ;; :ALL (or any other atom) to force all systems
+   ;;   including other systems we depend on.
+   ;; (SYSTEM1 SYSTEM2 ... SYSTEMN)
+   ;;   to force systems named in a given list
+   ;;   (but this feature never worked before ASDF 1.700 and is cerror'ed out.)
+   (forced :initform nil :initarg :force :accessor operation-forced)
    (original-initargs :initform nil :initarg :original-initargs
                       :accessor operation-original-initargs)
    (visited-nodes :initform nil :accessor operation-visited-nodes)
    (visiting-nodes :initform nil :accessor operation-visiting-nodes)
+   (visited-nodes :initform (make-hash-table :test 'equal) :accessor operation-visited-nodes)
+   (visiting-nodes :initform (make-hash-table :test 'equal) :accessor operation-visiting-nodes)
    (parent :initform nil :initarg :parent :accessor operation-parent)))
 …
                                      &key force
                                      &allow-other-keys)
   (declare (ignore slot-names force))
+  (declare (ignorable operation slot-names force))
   ;; empty method to disable initarg validity checking
+  )
+  (values))
 (defun node-for (o c)
 …
 (defun make-sub-operation (c o dep-c dep-o)
+  "C is a component, O is an operation, DEP-C is another
+component, and DEP-O, confusingly enough, is an operation
+class specifier, not an operation."
   (let* ((args (copy-list (operation-original-initargs o)))
          (force-p (getf args :force)))
 …
 (defmethod visit-component ((o operation) (c component) data)
   (unless (component-visited-p o c)
+    (push (cons (node-for o c) data)
+          (operation-visited-nodes (operation-ancestor o)))))
+    (setf (gethash (node-for o c)
+                   (operation-visited-nodes (operation-ancestor o)))
+          (cons t data))))
 (defmethod component-visited-p ((o operation) (c component))
+  (assoc (node-for o c)
+         (operation-visited-nodes (operation-ancestor o))
+         :test 'equal))
+  (gethash (node-for o c)
+           (operation-visited-nodes (operation-ancestor o))))
 (defmethod (setf visiting-component) (new-value operation component)
   ;; MCL complains about unused lexical variables
+  (declare (ignorable new-value operation component)))
+  (declare (ignorable operation component))
+  new-value)
 (defmethod (setf visiting-component) (new-value (o operation) (c component))
 …
         (a (operation-ancestor o)))
     (if new-value
         (pushnew node (operation-visiting-nodes a) :test 'equal)
         (setf (operation-visiting-nodes a)
               (remove node  (operation-visiting-nodes a) :test 'equal)))))
+        (setf (gethash node (operation-visiting-nodes a)) t)
+        (remhash node (operation-visiting-nodes a)))
+    new-value))
 (defmethod component-visiting-p ((o operation) (c component))
   (let ((node (node-for o c)))
+    (member node (operation-visiting-nodes (operation-ancestor o))
+            :test 'equal)))
+    (gethash node (operation-visiting-nodes (operation-ancestor o)))))
 (defmethod component-depends-on ((op-spec symbol) (c component))
 …
 (defmethod component-depends-on ((o operation) (c component))
   (cdr (assoc (class-name (class-of o))
               (slot-value c 'in-order-to))))
+              (component-in-order-to c))))
 (defmethod component-self-dependencies ((o operation) (c component))
 …
         (list (component-pathname c)))))
+(defmethod input-files ((operation operation) (c module)) nil)
+(defmethod input-files ((operation operation) (c module))
+  (declare (ignorable operation c))
+  nil)
+(defmethod component-operation-time (o c)
+  (gethash (type-of o) (component-operation-times c)))
 (defmethod operation-done-p ((o operation) (c component))
+  (flet ((fwd-or-return-t (file)
+           ;; if FILE-WRITE-DATE returns NIL, it's possible that the
+           ;; user or some other agent has deleted an input file.  If
+           ;; that's the case, well, that's not good, but as long as
+           ;; the operation is otherwise considered to be done we
+           ;; could continue and survive.
+           (let ((date (file-write-date file)))
+             (cond
+               (date)
+               (t
+                (warn "~@<Missing FILE-WRITE-DATE for ~S: treating ~
+                       operation ~S on component ~S as done.~@:>"
+                      file o c)
+                (return-from operation-done-p t))))))
+    (let ((out-files (output-files o c))
+          (in-files (input-files o c)))
+      (cond ((and (not in-files) (not out-files))
+             ;; arbitrary decision: an operation that uses nothing to
+             ;; produce nothing probably isn't doing much
+             t)
+            ((not out-files)
+             (let ((op-done
+                    (gethash (type-of o)
+                             (component-operation-times c))))
+               (and op-done
+                    (>= op-done
+                        (apply #'max
+                               (mapcar #'fwd-or-return-t in-files))))))
+            ((not in-files) nil)
+            (t
+             (and
+              (every #'probe-file out-files)
+              (> (apply #'min (mapcar #'file-write-date out-files))
+                 (apply #'max (mapcar #'fwd-or-return-t in-files)))))))))
+;;; So you look at this code and think "why isn't it a bunch of
+;;; methods".  And the answer is, because standard method combination
+;;; runs :before methods most->least-specific, which is back to front
+;;; for our purposes.
+(defmethod traverse ((operation operation) (c component))
+  (let ((forced nil))
+    (labels ((%do-one-dep (required-op required-c required-v)
+               (let* ((dep-c (or (find-component
+                                  (component-parent c)
+                                  ;; XXX tacky.  really we should build the
+                                  ;; in-order-to slot with canonicalized
+                                  ;; names instead of coercing this late
+                                  (coerce-name required-c) required-v)
+                                 (if required-v
+                                     (error 'missing-dependency-of-version
+                                            :required-by c
+                                            :version required-v
+                                            :requires required-c)
+                                     (error 'missing-dependency
+                                            :required-by c
+                                            :requires required-c))))
+                      (op (make-sub-operation c operation dep-c required-op)))
+                 (traverse op dep-c)))
+             (do-one-dep (required-op required-c required-v)
+               (loop
+                  (restart-case
+                      (return (%do-one-dep required-op required-c required-v))
+                    (retry ()
+                      :report (lambda (s)
+                                (format s "~@<Retry loading component ~S.~@:>"
+                                        required-c))
+                      :test
+                      (lambda (c)
+#|
+                        (print (list :c1 c (typep c 'missing-dependency)))
+                        (when (typep c 'missing-dependency)
+                          (print (list :c2 (missing-requires c) required-c
+                                       (equalp (missing-requires c)
+                                               required-c))))
+|#
+                        (and (typep c 'missing-dependency)
+                             (equalp (missing-requires c)
+                                     required-c)))))))
+             (do-dep (op dep)
+               (cond ((eq op 'feature)
+                      (or (member (car dep) *features*)
+                          (error 'missing-dependency
+                                 :required-by c
+                                 :requires (car dep))))
+                     (t
+                      (dolist (d dep)
+                        (cond ((consp d)
+                               (cond ((string-equal
+                                       (symbol-name (first d))
+                                       "VERSION")
+                                      (appendf
+                                       forced
+                                       (do-one-dep op (second d) (third d))))
+                                     ((and (string-equal
+                                            (symbol-name (first d))
+                                            "FEATURE")
+                                           (find (second d) *features*
+                                                 :test 'string-equal))
+                                      (appendf
+                                       forced
+                                       (do-one-dep op (second d) (third d))))
+                                     (t
+                                      (error "Bad dependency ~a.  Dependencies must be (:version <version>), (:feature <feature>), or a name" d))))
+                              (t
+                               (appendf forced (do-one-dep op d nil)))))))))
+  (let ((out-files (output-files o c))
+        (in-files (input-files o c))
+        (op-time (component-operation-time o c)))
+    (flet ((earliest-out ()
+             (reduce #'min (mapcar #'safe-file-write-date out-files)))
+           (latest-in ()
+             (reduce #'max (mapcar #'safe-file-write-date in-files))))
+      (cond
+        ((and (not in-files) (not out-files))
+         ;; arbitrary decision: an operation that uses nothing to
+         ;; produce nothing probably isn't doing much.
+         ;; e.g. operations on systems, modules that have no immediate action,
+         ;; but are only meaningful through traversed dependencies
+         t)
+        ((not out-files)
+         ;; an operation without output-files is probably meant
+         ;; for its side-effects in the current image,
+         ;; assumed to be idem-potent,
+         ;; e.g. LOAD-OP or LOAD-SOURCE-OP of some CL-SOURCE-FILE.
+         (and op-time (>= op-time (latest-in))))
+        ((not in-files)
+         ;; an operation without output-files and no input-files
+         ;; is probably meant for its side-effects on the file-system,
+         ;; assumed to have to be done everytime.
+         ;; (I don't think there is any such case in ASDF unless extended)
+         nil)
+        (t
+         ;; an operation with both input and output files is assumed
+         ;; as computing the latter from the former,
+         ;; assumed to have been done if the latter are all older
+         ;; than the former.
+         ;; e.g. COMPILE-OP of some CL-SOURCE-FILE.
+         ;; We use >= instead of > to play nice with generated files.
+         ;; This opens a race condition if an input file is changed
+         ;; after the output is created but within the same second
+         ;; of filesystem time; but the same race condition exists
+         ;; whenever the computation from input to output takes more
+         ;; than one second of filesystem time (or just crosses the
+         ;; second). So that's cool.
+         (and
+          (every #'probe-file in-files)
+          (every #'probe-file out-files)
+          (>= (earliest-out) (latest-in))))))))
+;;; For 1.700 I've done my best to refactor TRAVERSE
+;;; by splitting it up in a bunch of functions,
+;;; so as to improve the collection and use-detection algorithm. --fare
+;;; The protocol is as follows: we pass around operation, dependency,
+;;; bunch of other stuff, and a force argument. Return a force flag.
+;;; The returned flag is T if anything has changed that requires a rebuild.
+;;; The force argument is a list of components that will require a rebuild
+;;; if the flag is T, at which point whoever returns the flag has to
+;;; mark them all as forced, and whoever recurses again can use a NIL list
+;;; as a further argument.
+(defvar *forcing* nil
+  "This dynamically-bound variable is used to force operations in
+recursive calls to traverse.")
+(defgeneric do-traverse (operation component collect))
+(defun %do-one-dep (operation c collect required-op required-c required-v)
+  ;; collects a partial plan that results from performing required-op
+  ;; on required-c, possibly with a required-vERSION
+  (let* ((dep-c (or (let ((d (find-component (component-parent c) required-c)))
+                      (and d (version-satisfies d required-v) d))
+                    (if required-v
+                        (error 'missing-dependency-of-version
+                               :required-by c
+                               :version required-v
+                               :requires required-c)
+                        (error 'missing-dependency
+                               :required-by c
+                               :requires required-c))))
+         (op (make-sub-operation c operation dep-c required-op)))
+    (do-traverse op dep-c collect)))
+(defun do-one-dep (operation c collect required-op required-c required-v)
+  ;; this function is a thin, error-handling wrapper around
+  ;; %do-one-dep.  Returns a partial plan per that function.
+  (loop
+    (restart-case
+        (return (%do-one-dep operation c collect
+                             required-op required-c required-v))
+      (retry ()
+        :report (lambda (s)
+                  (format s "~@<Retry loading component ~S.~@:>"
+                          required-c))
+        :test
+        (lambda (c)
+          #|
+          (print (list :c1 c (typep c 'missing-dependency)))
+          (when (typep c 'missing-dependency)
+          (print (list :c2 (missing-requires c) required-c
+          (equalp (missing-requires c)
+          required-c))))
+          |#
+          (or (null c)
+              (and (typep c 'missing-dependency)
+                   (equalp (missing-requires c)
+                           required-c))))))))
+(defun do-dep (operation c collect op dep)
+  ;; type of arguments uncertain:
+  ;; op seems to at least potentially be a symbol, rather than an operation
+  ;; dep is a list of component names
+  (cond ((eq op 'feature)
+         (if (member (car dep) *features*)
+             nil
+             (error 'missing-dependency
+                    :required-by c
+                    :requires (car dep))))
+        (t
+         (let ((flag nil))
+           (flet ((dep (op comp ver)
+                    (when (do-one-dep operation c collect
+                                      op comp ver)
+                      (setf flag t))))
+             (dolist (d dep)
+               (if (atom d)
+                   (dep op d nil)
+                   ;; structured dependencies --- this parses keywords
+                   ;; the keywords could be broken out and cleanly (extensibly)
+                   ;; processed by EQL methods
+                   (cond ((eq :version (first d))
+                          ;; https://bugs.launchpad.net/asdf/+bug/527788
+                          (dep op (second d) (third d)))
+                         ;; This particular subform is not documented and
+                         ;; has always been broken in the past.
+                         ;; Therefore no one uses it, and I'm cerroring it out,
+                         ;; after fixing it
+                         ;; See https://bugs.launchpad.net/asdf/+bug/518467
+                         ((eq :feature (first d))
+                          (cerror "Continue nonetheless."
+                                  "Congratulations, you're the first ever user of FEATURE dependencies! Please contact the asdf-devel mailing-list.")
+                          (when (find (second d) *features* :test 'string-equal)
+                            (dep op (third d) nil)))
+                         (t
+                          (error "Bad dependency ~a.  Dependencies must be (:version <version>), (:feature <feature> [version]), or a name" d))))))
+           flag))))
+(defun do-collect (collect x)
+  (funcall collect x))
+(defmethod do-traverse ((operation operation) (c component) collect)
+  (let ((flag nil)) ;; return value: must we rebuild this and its dependencies?
+    (labels
+        ((update-flag (x)
+           (when x
+             (setf flag t)))
+         (dep (op comp)
+           (update-flag (do-dep operation c collect op comp))))
+      ;; Have we been visited yet? If so, just process the result.
       (aif (component-visited-p operation c)
+           (return-from traverse
+             (if (cdr it) (list (cons 'pruned-op c)) nil)))
+           (progn
+             (update-flag (cdr it))
+             (return-from do-traverse flag)))
       ;; dependencies
       (if (component-visiting-p operation c)
           (error 'circular-dependency :components (list c)))
+      (when (component-visiting-p operation c)
+        (error 'circular-dependency :components (list c)))
       (setf (visiting-component operation c) t)
       (unwind-protect
+           (progn
+             (loop for (required-op . deps) in
+                  (component-depends-on operation c)
+                  do (do-dep required-op deps))
+             ;; constituent bits
+             (let ((module-ops
+                    (when (typep c 'module)
+                      (let ((at-least-one nil)
+                            (forced nil)
+                            (error nil))
+                        (loop for kid in (module-components c)
+                           do (handler-case
+                                  (appendf forced (traverse operation kid ))
+                                (missing-dependency (condition)
+                                  (if (eq (module-if-component-dep-fails c)
+                                          :fail)
+                                      (error condition))
+                                  (setf error condition))
+                                (:no-error (c)
+                                  (declare (ignore c))
+                                  (setf at-least-one t))))
+                        (when (and (eq (module-if-component-dep-fails c)
+                                       :try-next)
+                                   (not at-least-one))
+                          (error error))
+                        forced))))
+               ;; now the thing itself
+               (when (or forced module-ops
+                         (not (operation-done-p operation c))
+                         (let ((f (operation-forced
+                                   (operation-ancestor operation))))
+                           (and f (or (not (consp f))
+                                      (member (component-name
+                                               (operation-ancestor operation))
+                                              (mapcar #'coerce-name f)
+                                              :test #'string=)))))
+                 (let ((do-first (cdr (assoc (class-name (class-of operation))
+                                             (slot-value c 'do-first)))))
+                   (loop for (required-op . deps) in do-first
+                      do (do-dep required-op deps)))
+                 (setf forced (append (delete 'pruned-op forced :key #'car)
+                                      (delete 'pruned-op module-ops :key #'car)
+                                      (list (cons operation c)))))))
+        (setf (visiting-component operation c) nil))
+      (visit-component operation c (and forced t))
+      forced)))
+           (progn
+             ;; first we check and do all the dependencies for the module.
+             ;; Operations planned in this loop will show up
+             ;; in the results, and are consumed below.
+             (let ((*forcing* nil))
+               ;; upstream dependencies are never forced to happen just because
+               ;; the things that depend on them are....
+               (loop
+                 :for (required-op . deps) :in (component-depends-on operation c)
+                 :do (dep required-op deps)))
+             ;; constituent bits
+             (let ((module-ops
+                    (when (typep c 'module)
+                      (let ((at-least-one nil)
+                            ;; This is set based on the results of the
+                            ;; dependencies and whether we are in the
+                            ;; context of a *forcing* call...
+                            ;; inter-system dependencies do NOT trigger
+                            ;; building components
+                            (*forcing*
+                             (or *forcing*
+                                 (and flag (not (typep c 'system)))))
+                            (error nil))
+                        (while-collecting (internal-collect)
+                          (dolist (kid (module-components c))
+                            (handler-case
+                                (update-flag
+                                 (do-traverse operation kid #'internal-collect))
+                              (missing-dependency (condition)
+                                (when (eq (module-if-component-dep-fails c)
+                                          :fail)
+                                  (error condition))
+                                (setf error condition))
+                              (:no-error (c)
+                                (declare (ignore c))
+                                (setf at-least-one t))))
+                          (when (and (eq (module-if-component-dep-fails c)
+                                         :try-next)
+                                     (not at-least-one))
+                            (error error)))))))
+               (update-flag
+                (or
+                 *forcing*
+                 (not (operation-done-p operation c))
+                 ;; For sub-operations, check whether
+                 ;; the original ancestor operation was forced,
+                 ;; or names us amongst an explicit list of things to force...
+                 ;; except that this check doesn't distinguish
+                 ;; between all the things with a given name. Sigh.
+                 ;; BROKEN!
+                 (let ((f (operation-forced
+                           (operation-ancestor operation))))
+                   (and f (or (not (consp f)) ;; T or :ALL
+                              (and (typep c 'system) ;; list of names of systems to force
+                                   (member (component-name c) f
+                                           :test #'string=)))))))
+               (when flag
+                 (let ((do-first (cdr (assoc (class-name (class-of operation))
+                                             (component-do-first c)))))
+                   (loop :for (required-op . deps) :in do-first
+                     :do (do-dep operation c collect required-op deps)))
+                 (do-collect collect (vector module-ops))
+                 (do-collect collect (cons operation c)))))
+             (setf (visiting-component operation c) nil)))
+      (visit-component operation c flag)
+      flag))
+(defmethod traverse ((operation operation) (c component))
+  ;; cerror'ing a feature that seems to have NEVER EVER worked
+  ;; ever since danb created it in his 2003-03-16 commit e0d02781.
+  ;; It was both fixed and disabled in the 1.700 rewrite.
+  (when (consp (operation-forced operation))
+    (cerror "Continue nonetheless."
+            "Congratulations, you're the first ever user of the :force (list of system names) feature! Please contact the asdf-devel mailing-list to collect a cookie.")
+    (setf (operation-forced operation)
+          (mapcar #'coerce-name (operation-forced operation))))
+  (flatten-tree
+   (while-collecting (collect)
+     (do-traverse operation c #'collect))))
+(defun flatten-tree (l)
+  ;; You collected things into a list.
+  ;; Most elements are just things to collect again.
+  ;; A (simple-vector 1) indicate that you should recurse into its contents.
+  ;; This way, in two passes (rather than N being the depth of the tree),
+  ;; you can collect things with marginally constant-time append,
+  ;; achieving linear time collection instead of quadratic time.
+  (while-collecting (c)
+    (labels ((r (x)
+               (if (typep x '(simple-vector 1))
+                   (r* (svref x 0))
+                   (c x)))
+             (r* (l)
+               (dolist (x l) (r x))))
+      (r* l))))
 (defmethod perform ((operation operation) (c source-file))
 …
 (defmethod perform ((operation operation) (c module))
+  (declare (ignorable operation c))
   nil)
 …
   (asdf-message "~&;;; ~A on ~A~%" operation component))
+;;; compile-op
+;;;; -------------------------------------------------------------------------
+;;;; compile-op
 (defclass compile-op (operation)
 …
                 :initform *compile-file-warnings-behaviour*)
    (on-failure :initarg :on-failure :accessor operation-on-failure
+               :initform *compile-file-failure-behaviour*)))
+               :initform *compile-file-failure-behaviour*)
+   (flags :initarg :flags :accessor compile-op-flags
+          :initform #-ecl nil #+ecl '(:system-p t))))
 (defmethod perform :before ((operation compile-op) (c source-file))
   (map nil #'ensure-directories-exist (output-files operation c)))
+#+ecl
+(defmethod perform :after ((o compile-op) (c cl-source-file))
+  ;; Note how we use OUTPUT-FILES to find the binary locations
+  ;; This allows the user to override the names.
+  (let* ((input (output-files o c))
+         (output (compile-file-pathname (lispize-pathname (first input)) :type :fasl)))
+    (c:build-fasl output :lisp-files (remove "fas" input :key #'pathname-type :test #'string=))))
 (defmethod perform :after ((operation operation) (c component))
 …
         (output-file (car (output-files operation c))))
     (multiple-value-bind (output warnings-p failure-p)
+        (compile-file source-file :output-file output-file)
+        (apply #'compile-file source-file :output-file output-file
+               (compile-op-flags operation))
       (when warnings-p
         (case (operation-on-warnings operation)
 …
 (defmethod output-files ((operation compile-op) (c cl-source-file))
+  #-:broken-fasl-loader (list (compile-file-pathname (component-pathname c)))
+  #+:broken-fasl-loader (list (component-pathname c)))
+  (declare (ignorable operation))
+  (let ((p (lispize-pathname (component-pathname c))))
+    #-:broken-fasl-loader
+    (list #-ecl (compile-file-pathname p)
+          #+ecl (compile-file-pathname p :type :object)
+          #+ecl (compile-file-pathname p :type :fasl))
+    #+:broken-fasl-loader (list p)))
 (defmethod perform ((operation compile-op) (c static-file))
+  (declare (ignorable operation c))
   nil)
 (defmethod output-files ((operation compile-op) (c static-file))
+  (declare (ignorable operation c))
   nil)
+(defmethod input-files ((op compile-op) (c static-file))
+(defmethod input-files ((operation compile-op) (c static-file))
+  (declare (ignorable operation c))
   nil)
+;;; load-op
+;;;; -------------------------------------------------------------------------
+;;;; load-op
 (defclass basic-load-op (operation) ())
 …
 (defmethod perform ((o load-op) (c cl-source-file))
+  (mapcar #'load (input-files o c)))
+(defmethod perform around ((o load-op) (c cl-source-file))
+  (let ((state :initial))
+    (loop until (or (eq state :success)
+                    (eq state :failure)) do
+         (case state
+           (:recompiled
+            (setf state :failure)
+            (call-next-method)
+            (setf state :success))
+           (:failed-load
+            (setf state :recompiled)
+            (perform (make-instance 'asdf:compile-op) c))
+           (t
+            (with-simple-restart
+                (try-recompiling "Recompile ~a and try loading it again"
+                                  (component-name c))
+              (setf state :failed-load)
+              (call-next-method)
+              (setf state :success)))))))
+(defmethod perform around ((o compile-op) (c cl-source-file))
+  (let ((state :initial))
+    (loop until (or (eq state :success)
+                    (eq state :failure)) do
+         (case state
+           (:recompiled
+            (setf state :failure)
+            (call-next-method)
+            (setf state :success))
+           (:failed-compile
+            (setf state :recompiled)
+            (perform (make-instance 'asdf:compile-op) c))
+           (t
+            (with-simple-restart
+                (try-recompiling "Try recompiling ~a"
+                                  (component-name c))
+              (setf state :failed-compile)
+              (call-next-method)
+              (setf state :success)))))))
+  #-ecl (mapcar #'load (input-files o c))
+  #+ecl (loop :for i :in (input-files o c)
+          :unless (string= (pathname-type i) "fas")
+          :collect (let ((output (compile-file-pathname (lispize-pathname i))))
+                     (load output))))
+(defmethod perform-with-restarts (operation component)
+  (perform operation component))
+(defmethod perform-with-restarts ((o load-op) (c cl-source-file))
+  (declare (ignorable o))
+  (loop :with state = :initial
+    :until (or (eq state :success)
+               (eq state :failure)) :do
+    (case state
+      (:recompiled
+       (setf state :failure)
+       (call-next-method)
+       (setf state :success))
+      (:failed-load
+       (setf state :recompiled)
+       (perform (make-instance 'compile-op) c))
+      (t
+       (with-simple-restart
+           (try-recompiling "Recompile ~a and try loading it again"
+                            (component-name c))
+         (setf state :failed-load)
+         (call-next-method)
+         (setf state :success))))))
+(defmethod perform-with-restarts ((o compile-op) (c cl-source-file))
+  (loop :with state = :initial
+    :until (or (eq state :success)
+               (eq state :failure)) :do
+    (case state
+      (:recompiled
+       (setf state :failure)
+       (call-next-method)
+       (setf state :success))
+      (:failed-compile
+       (setf state :recompiled)
+       (perform-with-restarts o c))
+      (t
+       (with-simple-restart
+           (try-recompiling "Try recompiling ~a"
+                            (component-name c))
+         (setf state :failed-compile)
+         (call-next-method)
+         (setf state :success))))))
 (defmethod perform ((operation load-op) (c static-file))
+  (declare (ignorable operation c))
   nil)
 (defmethod operation-done-p ((operation load-op) (c static-file))
+  (declare (ignorable operation c))
   t)
+(defmethod output-files ((o operation) (c component))
+(defmethod output-files ((operation operation) (c component))
+  (declare (ignorable operation c))
   nil)
 (defmethod component-depends-on ((operation load-op) (c component))
+  (declare (ignorable operation))
   (cons (list 'compile-op (component-name c))
         (call-next-method)))
+;;; load-source-op
+;;;; -------------------------------------------------------------------------
+;;;; load-source-op
 (defclass load-source-op (basic-load-op) ())
 (defmethod perform ((o load-source-op) (c cl-source-file))
+  (declare (ignorable o))
   (let ((source (component-pathname c)))
     (setf (component-property c 'last-loaded-as-source)
 …
 (defmethod perform ((operation load-source-op) (c static-file))
+  (declare (ignorable operation c))
   nil)
 (defmethod output-files ((operation load-source-op) (c component))
+  (declare (ignorable operation c))
   nil)
 ;;; FIXME: we simply copy load-op's dependencies.  this is Just Not Right.
 (defmethod component-depends-on ((o load-source-op) (c component))
+  (declare (ignorable o))
   (let ((what-would-load-op-do (cdr (assoc 'load-op
                                            (slot-value c 'in-order-to)))))
+                                           (component-in-order-to c)))))
     (mapcar (lambda (dep)
               (if (eq (car dep) 'load-op)
 …
 (defmethod operation-done-p ((o load-source-op) (c source-file))
+  (declare (ignorable o))
   (if (or (not (component-property c 'last-loaded-as-source))
           (> (file-write-date (component-pathname c))
+          (> (safe-file-write-date (component-pathname c))
              (component-property c 'last-loaded-as-source)))
       nil t))
+;;;; -------------------------------------------------------------------------
+;;;; test-op
 (defclass test-op (operation) ())
 (defmethod perform ((operation test-op) (c component))
+  (declare (ignorable operation c))
   nil)
 (defmethod operation-done-p ((operation test-op) (c system))
   "Testing a system is _never_ done."
+  (declare (ignorable operation c))
   nil)
 (defmethod component-depends-on :around ((o test-op) (c system))
+  (declare (ignorable o))
   (cons `(load-op ,(component-name c)) (call-next-method)))
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; invoking operations
+(defun operate (operation-class system &rest args &key (verbose t) version force
+                &allow-other-keys)
+;;;; -------------------------------------------------------------------------
+;;;; Invoking Operations
+(defgeneric operate (operation-class system &key &allow-other-keys))
+(defmethod operate (operation-class system &rest args
+                    &key ((:verbose *asdf-verbose*) *asdf-verbose*) version force
+                    &allow-other-keys)
   (declare (ignore force))
   (let* ((*package* *package*)
 …
                     :original-initargs args
                     args))
          (*verbose-out* (if verbose *standard-output* (make-broadcast-stream)))
+         (*verbose-out* (if *asdf-verbose* *standard-output* (make-broadcast-stream)))
          (system (if (typep system 'component) system (find-system system))))
     (unless (version-satisfies system version)
 …
     (let ((steps (traverse op system)))
       (with-compilation-unit ()
+        (loop for (op . component) in steps do
+                 (loop
+                   (restart-case
+                       (progn (perform op component)
+                              (return))
+                     (retry ()
+                       :report
+                       (lambda (s)
+                         (format s "~@<Retry performing ~S on ~S.~@:>"
+                                 op component)))
+                     (accept ()
+                       :report
+                       (lambda (s)
+                         (format s "~@<Continue, treating ~S on ~S as ~
+        (loop :for (op . component) :in steps :do
+          (loop
+            (restart-case
+                (progn
+                  (perform-with-restarts op component)
+                  (return))
+              (retry ()
+                :report
+                (lambda (s)
+                  (format s "~@<Retry performing ~S on ~S.~@:>"
+                          op component)))
+              (accept ()
+                :report
+                (lambda (s)
+                  (format s "~@<Continue, treating ~S on ~S as ~
                                    having been successful.~@:>"
                                  op component))
                        (setf (gethash (type-of op)
                                       (component-operation-times component))
                              (get-universal-time))
                        (return)))))))
+                          op component))
+                (setf (gethash (type-of op)
+                               (component-operation-times component))
+                      (get-universal-time))
+                (return)))))))
     op))
 (defun oos (operation-class system &rest args &key force (verbose t) version
             &allow-other-keys)
+(defun oos (operation-class system &rest args &key force verbose version
+            &allow-other-keys)
   (declare (ignore force verbose version))
   (apply #'operate operation-class system args))
 …
 "))
   (setf (documentation 'oos 'function)
         (format nil
                 "Short for _operate on system_ and an alias for the [operate][] function. ~&~&~a"
                 operate-docstring))
+        (format nil
+                "Short for _operate on system_ and an alias for the OPERATE function. ~&~&~a"
+                operate-docstring))
   (setf (documentation 'operate 'function)
+        operate-docstring))
+(defun load-system (system &rest args &key force (verbose t) version)
+  "Shorthand for `(operate 'asdf:load-op system)`. See [operate][] for details."
+        operate-docstring))
+(defun load-system (system &rest args &key force verbose version
+                    &allow-other-keys)
+  "Shorthand for `(operate 'asdf:load-op system)`. See OPERATE for
+details."
   (declare (ignore force verbose version))
   (apply #'operate 'load-op system args))
+(defun compile-system (system &rest args &key force (verbose t) version)
+  "Shorthand for `(operate 'asdf:compile-op system)`. See [operate][] for details."
+(defun compile-system (system &rest args &key force verbose version
+                       &allow-other-keys)
+  "Shorthand for `(operate 'asdf:compile-op system)`. See OPERATE
+for details."
   (declare (ignore force verbose version))
   (apply #'operate 'compile-op system args))
+(defun test-system (system &rest args &key force (verbose t) version)
+  "Shorthand for `(operate 'asdf:test-op system)`. See [operate][] for details."
+(defun test-system (system &rest args &key force verbose version
+                    &allow-other-keys)
+  "Shorthand for `(operate 'asdf:test-op system)`. See OPERATE for
+details."
   (declare (ignore force verbose version))
   (apply #'operate 'test-op system args))
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; syntax
+(defun remove-keyword (key arglist)
+  (labels ((aux (key arglist)
+             (cond ((null arglist) nil)
+                   ((eq key (car arglist)) (cddr arglist))
+                   (t (cons (car arglist) (cons (cadr arglist)
+                                                (remove-keyword
+                                                 key (cddr arglist))))))))
+    (aux key arglist)))
+(defun resolve-symlinks (path)
+  #-allegro (truename path)
+  #+allegro (excl:pathname-resolve-symbolic-links path)
+  )
+;;;; -------------------------------------------------------------------------
+;;;; Defsystem
 (defun determine-system-pathname (pathname pathname-supplied-p)
   ;; called from the defsystem macro.
   ;; the pathname of a system is either
   ;; 1. the one supplied,
+  ;; 1. the one supplied,
   ;; 2. derived from the *load-truename* (see below), or
   ;; 3. taken from *default-pathname-defaults*
 …
   ;; *load-pathname* instead of *load-truename* since in some
   ;; implementations, the latter has *already resolved it.
+  (or (and pathname-supplied-p pathname)
+      (when *load-truename*
+        (pathname-sans-name+type
+         (if *resolve-symlinks*
+             (resolve-symlinks *load-truename*)
+             *load-pathname*)))
+      *default-pathname-defaults*))
+  (let ((file-pathname
+         (when (or *load-pathname* *compile-file-pathname*)
+           (pathname-directory-pathname
+            (if *resolve-symlinks*
+                (resolve-symlinks (or *load-truename* *compile-file-truename*))
+                *load-pathname*)))))
+    (or (and pathname-supplied-p (merge-pathnames* pathname file-pathname))
+        file-pathname
+        (current-directory))))
 (defmacro defsystem (name &body options)
   (destructuring-bind (&key (pathname nil pathname-arg-p) (class 'system)
                             &allow-other-keys)
+                            defsystem-depends-on &allow-other-keys)
       options
     (let ((component-options (remove-keyword :class options)))
+    (let ((component-options (remove-keys '(:defsystem-depends-on :class) options)))
       `(progn
          ;; system must be registered before we parse the body, otherwise
          ;; we recur when trying to find an existing system of the same name
          ;; to reuse options (e.g. pathname) from
+         ,@(loop :for system :in defsystem-depends-on
+             :collect `(load-system ,system))
          (let ((s (system-registered-p ',name)))
            (cond ((and s (eq (type-of (cdr s)) ',class))
 …
                   (register-system (quote ,name)
                                    (make-instance ',class :name ',name))))
+           (%set-system-source-file *load-truename*
+                                    (cdr (system-registered-p ',name))))
+         (parse-component-form
+          nil (apply
+               #'list
+               :module (coerce-name ',name)
+               :pathname
+               ,(determine-system-pathname pathname pathname-arg-p)
+               ',component-options))))))
+           (%set-system-source-file *load-truename*
+                                    (cdr (system-registered-p ',name))))
+         (parse-component-form
+          nil (list*
+               :module (coerce-name ',name)
+               :pathname
+               ,(determine-system-pathname pathname pathname-arg-p)
+               ',component-options))))))
 …
+(defun remove-keys (key-names args)
+  (loop for ( name val ) on args by #'cddr
+        unless (member (symbol-name name) key-names
+                       :key #'symbol-name :test 'equal)
+        append (list name val)))
+(defvar *serial-depends-on*)
+(defvar *serial-depends-on* nil)
 (defun sysdef-error-component (msg type name value)
   (sysdef-error (concatenate 'string msg
                              "~&The value specified for ~(~A~) ~A is ~W")
+                             "~&The value specified for ~(~A~) ~A is ~S")
                 type name value))
 (defun check-component-input (type name weakly-depends-on
                               depends-on components in-order-to)
+(defun check-component-input (type name weakly-depends-on
+                              depends-on components in-order-to)
   "A partial test of the values of a component."
   (unless (listp depends-on)
 …
 (defun %remove-component-inline-methods (component)
   (loop for name in +asdf-methods+
         do (map 'nil
                 ;; this is inefficient as most of the stored
                 ;; methods will not be for this particular gf n
                 ;; But this is hardly performance-critical
                 (lambda (m)
                   (remove-method (symbol-function name) m))
                 (component-inline-methods component)))
+  (dolist (name +asdf-methods+)
+    (map ()
+         ;; this is inefficient as most of the stored
+         ;; methods will not be for this particular gf
+         ;; But this is hardly performance-critical
+         (lambda (m)
+           (remove-method (symbol-function name) m))
+         (component-inline-methods component)))
   ;; clear methods, then add the new ones
   (setf (component-inline-methods component) nil))
 (defun %define-component-inline-methods (ret rest)
   (loop for name in +asdf-methods+ do
        (let ((keyword (intern (symbol-name name) :keyword)))
          (loop for data = rest then (cddr data)
               for key = (first data)
               for value = (second data)
               while data
               when (eq key keyword) do
               (destructuring-bind (op qual (o c) &body body) value
               (pushnew
                  (eval `(defmethod ,name ,qual ((,o ,op) (,c (eql ,ret)))
                                    ,@body))
                  (component-inline-methods ret)))))))
+  (dolist (name +asdf-methods+)
+    (let ((keyword (intern (symbol-name name) :keyword)))
+      (loop :for data = rest :then (cddr data)
+        :for key = (first data)
+        :for value = (second data)
+        :while data
+        :when (eq key keyword) :do
+        (destructuring-bind (op qual (o c) &body body) value
+          (pushnew
+           (eval `(defmethod ,name ,qual ((,o ,op) (,c (eql ,ret)))
+                             ,@body))
+           (component-inline-methods ret)))))))
 (defun %refresh-component-inline-methods (component rest)
   (%remove-component-inline-methods component)
   (%define-component-inline-methods component rest))
 (defun parse-component-form (parent options)
   (destructuring-bind
         (type name &rest rest &key
 …
                 (make-instance (class-for-type parent type)))))
       (when weakly-depends-on
+        (setf depends-on (append depends-on (remove-if (complement #'find-system) weakly-depends-on))))
+      (when (boundp '*serial-depends-on*)
+        (setf depends-on
+              (concatenate 'list *serial-depends-on* depends-on)))
+        (appendf depends-on (remove-if (complement #'find-system) weakly-depends-on)))
+      (when *serial-depends-on*
+        (push *serial-depends-on* depends-on))
       (apply #'reinitialize-instance ret
              :name (coerce-name name)
 …
              :parent parent
              other-args)
+      (component-pathname ret) ; eagerly compute the absolute pathname
       (when (typep ret 'module)
         (setf (module-default-component-class ret)
 …
         (let ((*serial-depends-on* nil))
           (setf (module-components ret)
+                (loop for c-form in components
+                      for c = (parse-component-form ret c-form)
+                      collect c
+                      if serial
+                      do (push (component-name c) *serial-depends-on*))))
+        ;; check for duplicate names
+        (let ((name-hash (make-hash-table :test #'equal)))
+          (loop for c in (module-components ret)
+                do
+                (if (gethash (component-name c)
+                             name-hash)
+                    (error 'duplicate-names
+                           :name (component-name c))
+                    (setf (gethash (component-name c)
+                                   name-hash)
+                          t)))))
+      (setf (slot-value ret 'in-order-to)
+                (loop
+                  :for c-form :in components
+                  :for c = (parse-component-form ret c-form)
+                  :for name = (component-name c)
+                  :collect c
+                  :when serial :do (setf *serial-depends-on* name))))
+        (compute-module-components-by-name ret))
+      (setf (component-load-dependencies ret) depends-on) ;; Used by POIU
+      (setf (component-in-order-to ret)
             (union-of-dependencies
              in-order-to
              `((compile-op (compile-op ,@depends-on))
                (load-op (load-op ,@depends-on))))
             (slot-value ret 'do-first) `((compile-op (load-op ,@depends-on))))
+               (load-op (load-op ,@depends-on)))))
+      (setf (component-do-first ret) `((compile-op (load-op ,@depends-on))))
       (%refresh-component-inline-methods ret rest)
       ret)))
+;;; optional extras
+;;; run-shell-command functions for other lisp implementations will be
+;;; gratefully accepted, if they do the same thing.  If the docstring
+;;; is ambiguous, send a bug report
+;;;; ---------------------------------------------------------------------------
+;;;; run-shell-command
+;;;;
+;;;; run-shell-command functions for other lisp implementations will be
+;;;; gratefully accepted, if they do the same thing.
+;;;; If the docstring is ambiguous, send a bug report.
+;;;;
+;;;; We probably should move this functionality to its own system and deprecate
+;;;; use of it from the asdf package. However, this would break unspecified
+;;;; existing software, so until a clear alternative exists, we can't deprecate
+;;;; it, and even after it's been deprecated, we will support it for a few
+;;;; years so everyone has time to migrate away from it. -- fare 2009-12-01
 (defun run-shell-command (control-string &rest args)
 …
   (let ((command (apply #'format nil control-string args)))
     (asdf-message "; $ ~A~%" command)
+    #+abcl
+    (ext:run-shell-command command :output *verbose-out*)
+    #+allegro
+    ;; will this fail if command has embedded quotes - it seems to work
+    (multiple-value-bind (stdout stderr exit-code)
+        (excl.osi:command-output
+         (format nil "~a -c \"~a\""
+                 #+mswindows "sh" #-mswindows "/bin/sh" command)
+         :input nil :whole nil
+         #+mswindows :show-window #+mswindows :hide)
+      (format *verbose-out* "~{~&; ~a~%~}~%" stderr)
+      (format *verbose-out* "~{~&; ~a~%~}~%" stdout)
+      exit-code)
+    #+clisp                     ;XXX not exactly *verbose-out*, I know
+    (ext:run-shell-command  command :output :terminal :wait t)
+    #+clozure
+    (nth-value 1
+               (ccl:external-process-status
+                (ccl:run-program "/bin/sh" (list "-c" command)
+                                 :input nil :output *verbose-out*
+                                 :wait t)))
+    #+ecl ;; courtesy of Juan Jose Garcia Ripoll
+    (si:system command)
+    #+gcl
+    (lisp:system command)
+    #+lispworks
+    (system:call-system-showing-output
+     command
+     :shell-type "/bin/sh"
+     :show-cmd nil
+     :prefix ""
+     :output-stream *verbose-out*)
     #+sbcl
     (sb-ext:process-exit-code
      (apply #'sb-ext:run-program
             #+win32 "sh" #-win32 "/bin/sh"
             (list  "-c" command)
             :input nil :output *verbose-out*
             #+win32 '(:search t) #-win32 nil))
+            #+win32 "sh" #-win32 "/bin/sh"
+            (list  "-c" command)
+            :input nil :output *verbose-out*
+            #+win32 '(:search t) #-win32 nil))
     #+(or cmu scl)
 …
       :input nil :output *verbose-out*))
+    #+allegro
+    ;; will this fail if command has embedded quotes - it seems to work
+    (multiple-value-bind (stdout stderr exit-code)
+        (excl.osi:command-output
+         (format nil "~a -c \"~a\""
+                 #+mswindows "sh" #-mswindows "/bin/sh" command)
+         :input nil :whole nil
+         #+mswindows :show-window #+mswindows :hide)
+      (format *verbose-out* "~{~&; ~a~%~}~%" stderr)
+      (format *verbose-out* "~{~&; ~a~%~}~%" stdout)
+      exit-code)
+    #+lispworks
+    (system:call-system-showing-output
+     command
+     :shell-type "/bin/sh"
+     :output-stream *verbose-out*)
+    #+clisp                     ;XXX not exactly *verbose-out*, I know
+    (ext:run-shell-command  command :output :terminal :wait t)
+    #+openmcl
+    (nth-value 1
+               (ccl:external-process-status
+                (ccl:run-program "/bin/sh" (list "-c" command)
+                                 :input nil :output *verbose-out*
+                                 :wait t)))
+    #+ecl ;; courtesy of Juan Jose Garcia Ripoll
+    (si:system command)
+    #-(or openmcl clisp lispworks allegro scl cmu sbcl ecl)
+    (error "RUN-SHELL-PROGRAM not implemented for this Lisp")
+    ))
+(defmethod system-source-file ((system-name t))
+    #-(or abcl allegro clisp clozure cmu ecl gcl lispworks sbcl scl)
+    (error "RUN-SHELL-COMMAND not implemented for this Lisp")))
+;;;; ---------------------------------------------------------------------------
+;;;; system-relative-pathname
+(defmethod system-source-file ((system-name string))
   (system-source-file (find-system system-name)))
+(defun system-source-directory (system-name)
+  (make-pathname :name nil
+(defmethod system-source-file ((system-name symbol))
+  (system-source-file (find-system system-name)))
+(defun system-source-directory (system-designator)
+  "Return a pathname object corresponding to the
+directory in which the system specification (.asd file) is
+located."
+     (make-pathname :name nil
                  :type nil
+                 :defaults (system-source-file system-name)))
+(defun system-relative-pathname (system pathname &key name type)
+  ;; you're not allowed to muck with the return value of pathname-X
+  (let ((directory (copy-list (pathname-directory pathname))))
+    (when (eq (car directory) :absolute)
+      (setf (car directory) :relative))
+    (merge-pathnames
+     (make-pathname :name (or name (pathname-name pathname))
+                    :type (or type (pathname-type pathname))
+                    :directory directory)
+     (system-source-directory system))))
+                 :defaults (system-source-file system-designator)))
+(defun relativize-directory (directory)
+  (cond
+    ((stringp directory)
+     (list :relative directory))
+    ((eq (car directory) :absolute)
+     (cons :relative (cdr directory)))
+    (t
+     directory)))
+(defun relativize-pathname-directory (pathspec)
+  (let ((p (pathname pathspec)))
+    (make-pathname
+     :directory (relativize-directory (pathname-directory p))
+     :defaults p)))
+(defun system-relative-pathname (system name &key type)
+  (merge-pathnames*
+   (merge-component-name-type name :type type)
+   (system-source-directory system)))
 ;;; ---------------------------------------------------------------------------
 ;;; asdf-binary-locations
+;;; implementation-identifier
 ;;;
+;;; this bit of code was stolen from Bjorn Lindberg and then it grew!
+;;; see http://www.cliki.net/asdf%20binary%20locations
+;;; and http://groups.google.com/group/comp.lang.lisp/msg/bd5ea9d2008ab9fd
+;;; ---------------------------------------------------------------------------
+;;; Portions of this code were once from SWANK / SLIME
+(defparameter *centralize-lisp-binaries*
+  nil "
+If true, compiled lisp files without an explicit mapping (see
+\\*source-to-target-mappings\\*) will be placed in subdirectories of
+\\*default-toplevel-directory\\*. If false, then compiled lisp files
+without an explicitly mapping will be placed in subdirectories of
+their sources.")
+(defparameter *enable-asdf-binary-locations* nil
+  "
+If true, then compiled lisp files will be placed into a directory
+computed from the Lisp version, Operating System and computer archetecture.
+See [implementation-specific-directory-name][] for details.")
+(defparameter *default-toplevel-directory*
+  (merge-pathnames
+   (make-pathname :directory '(:relative ".fasls"))
+   (truename (user-homedir-pathname)))
+  "If \\*centralize-lisp-binaries\\* is true, then compiled lisp files without an explicit mapping \(see \\*source-to-target-mappings\\*\) will be placed in subdirectories of \\*default-toplevel-directory\\*.")
+(defparameter *include-per-user-information*
+  nil
+  "When \\*centralize-lisp-binaries\\* is true this variable controls whether or not to customize the output directory based on the current user. It can be nil, t or a string. If it is nil \(the default\), then no additional information will be added to the output directory. If it is t, then the user's name \(as taken from the return value of #'user-homedir-pathname\) will be included into the centralized path (just before the lisp-implementation directory). Finally, if \\*include-per-user-information\\* is a string, then this string will be included in the output-directory.")
+(defparameter *map-all-source-files*
+  nil
+  "If true, then all subclasses of source-file will have their output locations mapped by ASDF-Binary-Locations. If nil (the default), then only subclasses of cl-source-file will be mapped.")
+(defvar *source-to-target-mappings*
+  #-sbcl
+  nil
+  #+sbcl
+  (list (list (princ-to-string (sb-ext:posix-getenv "SBCL_HOME")) nil))
+  "The \\*source-to-target-mappings\\* variable specifies mappings from source to target. If the target is nil, then it means to not map the source to anything. I.e., to leave it as is. This has the effect of turning off ASDF-Binary-Locations for the given source directory. Examples:
+    ;; compile everything in .../src and below into .../cmucl
+    '((\"/nfs/home/compbio/d95-bli/share/common-lisp/src/\"
+       \"/nfs/home/compbio/d95-bli/lib/common-lisp/cmucl/\"))
+    ;; leave SBCL innards alone (SBCL specific)
+    (list (list (princ-to-string (sb-ext:posix-getenv \"SBCL_HOME\")) nil))
+")
+;;; produce a string to identify current implementation.
+;;; Initially stolen from SLIME's SWANK, hacked since.
 (defparameter *implementation-features*
   '(:allegro :lispworks :sbcl :ccl :openmcl :cmu :clisp
+  '(:allegro :lispworks :sbcl :clozure :digitool :cmu :clisp
     :corman :cormanlisp :armedbear :gcl :ecl :scl))
 (defparameter *os-features*
+  '(:windows :mswindows :win32 :mingw32
+    :solaris :sunos
+  '((:windows :mswindows :win32 :mingw32)
+    (:solaris :sunos)
+    :linux ;; for GCL at least, must appear before :bsd.
     :macosx :darwin :apple
     :freebsd :netbsd :openbsd :bsd
     :linux :unix))
+    :unix))
 (defparameter *architecture-features*
+  '(:amd64 (:x86-64 :x86_64 :x8664-target) :i686 :i586 :pentium3
+    :i486 (:i386 :pc386 :iapx386) (:x86 :x8632-target) :pentium4
+    :hppa64 :hppa :ppc64 :ppc32 :powerpc :ppc :sparc64 :sparc))
+;; note to gwking: this is in slime, system-check, and system-check-server too
+  '((:x86-64 :amd64 :x86_64 :x8664-target)
+    (:x86 :i686 :i586 :pentium3 :i486 :i386 :pc386 :iapx386 :x8632-target :pentium4)
+    :hppa64 :hppa :ppc64 (:ppc32 :ppc :powerpc) :sparc64 :sparc))
 (defun lisp-version-string ()
+  #+cmu       (substitute #\- #\/
+                          (substitute #\_ #\Space
+                                      (lisp-implementation-version)))
+  #+scl       (lisp-implementation-version)
+  #+sbcl      (lisp-implementation-version)
+  #+ecl       (reduce (lambda (x str) (substitute #\_ str x))
+                      '(#\Space #\: #\( #\))
+                      :initial-value (lisp-implementation-version))
+  #+gcl       (let ((s (lisp-implementation-version))) (subseq s 4))
+  #+openmcl   (format nil "~d.~d~@[-~d~]"
+                      ccl::*openmcl-major-version*
+                      ccl::*openmcl-minor-version*
+                      #+ppc64-target 64
+                      #-ppc64-target nil)
+  #+lispworks (format nil "~A~@[~A~]"
+                      (lisp-implementation-version)
+                      (when (member :lispworks-64bit *features*) "-64bit"))
+  #+allegro   (format nil
+  (let ((s (lisp-implementation-version)))
+    (declare (ignorable s))
+    #+allegro (format nil
                       "~A~A~A~A"
                       excl::*common-lisp-version-number*
+                                        ; ANSI vs MoDeRn
+                      ;; thanks to Robert Goldman and Charley Cox for
+                      ;; an improvement to my hack
+                      (if (eq excl:*current-case-mode*
+                              :case-sensitive-lower) "M" "A")
+                      ;; Note if not using International ACL
+                      ;; see http://www.franz.com/support/documentation/8.1/doc/operators/excl/ics-target-case.htm
+                      (excl:ics-target-case
+                        (:-ics "8")
+                        (:+ics ""))
+                      ;; ANSI vs MoDeRn - thanks to Robert Goldman and Charley Cox
+                      (if (eq excl:*current-case-mode*
+                              :case-sensitive-lower) "M" "A")
+                      ;; Note if not using International ACL
+                      ;; see http://www.franz.com/support/documentation/8.1/doc/operators/excl/ics-target-case.htm
+                      (excl:ics-target-case
+                       (:-ics "8")
+                       (:+ics ""))
                       (if (member :64bit *features*) "-64bit" ""))
+  #+clisp     (let ((s (lisp-implementation-version)))
+                (subseq s 0 (position #\space s)))
+  #+armedbear (lisp-implementation-version)
+  #+cormanlisp (lisp-implementation-version)
+  #+digitool   (subseq (lisp-implementation-version) 8))
+(defparameter *implementation-specific-directory-name* nil)
+(defun implementation-specific-directory-name ()
+  "Return a name that can be used as a directory name that is
+unique to a Lisp implementation, Lisp implementation version,
+operating system, and hardware architecture."
+  (and *enable-asdf-binary-locations*
+       (list
+        (or *implementation-specific-directory-name*
+            (setf *implementation-specific-directory-name*
+                  (labels
+                      ((fp (thing)
+                         (etypecase thing
+                           (symbol
+                            (let ((feature (find thing *features*)))
+                              (when feature (return-from fp feature))))
+                           ;; allows features to be lists of which the first
+                           ;; member is the "main name", the rest being aliases
+                           (cons
+                            (dolist (subf thing)
+                              (let ((feature (find subf *features*)))
+                                (when feature (return-from fp (first thing))))))))
+                       (first-of (features)
+                         (loop for f in features
+                            when (fp f) return it))
+                       (maybe-warn (value fstring &rest args)
+                         (cond (value)
+                               (t (apply #'warn fstring args)
+                                  "unknown"))))
+                    (let ((lisp (maybe-warn (first-of *implementation-features*)
+                                            "No implementation feature found in ~a."
+                                            *implementation-features*))
+                          (os   (maybe-warn (first-of *os-features*)
+                                            "No os feature found in ~a." *os-features*))
+                          (arch (maybe-warn (first-of *architecture-features*)
+                                            "No architecture feature found in ~a."
+                                            *architecture-features*))
+                          (version (maybe-warn (lisp-version-string)
+                                               "Don't know how to get Lisp ~
+    #+clisp (subseq s 0 (position #\space s))
+    #+clozure (format nil "~d.~d-fasl~d"
+                      ccl::*openmcl-major-version*
+                      ccl::*openmcl-minor-version*
+                      (logand ccl::fasl-version #xFF))
+    #+cmu (substitute #\- #\/ s)
+    #+digitool (subseq s 8)
+    #+ecl (format nil "~A~@[-~A~]" s
+                  (let ((vcs-id (ext:lisp-implementation-vcs-id)))
+                    (when (>= (length vcs-id) 8)
+                      (subseq vcs-id 0 8))))
+    #+gcl (subseq s (1+ (position #\space s)))
+    #+lispworks (format nil "~A~@[~A~]" s
+                        (when (member :lispworks-64bit *features*) "-64bit"))
+    ;; #+sbcl (format nil "~a-fasl~d" s sb-fasl:+fasl-file-version+) ; fasl-f-v is redundant
+    #+(or armedbear cormanlisp mcl sbcl scl) s
+    #-(or allegro armedbear clisp clozure cmu cormanlisp digitool
+          ecl gcl lispworks mcl sbcl scl) s))
+(defun first-feature (features)
+  (labels
+      ((fp (thing)
+         (etypecase thing
+           (symbol
+            (let ((feature (find thing *features*)))
+              (when feature (return-from fp feature))))
+           ;; allows features to be lists of which the first
+           ;; member is the "main name", the rest being aliases
+           (cons
+            (dolist (subf thing)
+              (when (find subf *features*) (return-from fp (first thing))))))
+         nil))
+    (loop :for f :in features
+      :when (fp f) :return :it)))
+(defun implementation-type ()
+  (first-feature *implementation-features*))
+(defun implementation-identifier ()
+  (labels
+      ((maybe-warn (value fstring &rest args)
+         (cond (value)
+               (t (apply #'warn fstring args)
+                  "unknown"))))
+    (let ((lisp (maybe-warn (implementation-type)
+                            "No implementation feature found in ~a."
+                            *implementation-features*))
+          (os   (maybe-warn (first-feature *os-features*)
+                            "No os feature found in ~a." *os-features*))
+          (arch (maybe-warn (first-feature *architecture-features*)
+                            "No architecture feature found in ~a."
+                            *architecture-features*))
+          (version (maybe-warn (lisp-version-string)
+                               "Don't know how to get Lisp ~
                                           implementation version.")))
+                      (format nil "~(~@{~a~^-~}~)" lisp version os arch))))))))
+(defun pathname-prefix-p (prefix pathname)
+  (let ((prefix-ns (namestring prefix))
+        (pathname-ns (namestring pathname)))
+    (= (length prefix-ns)
+       (mismatch prefix-ns pathname-ns))))
+(defgeneric output-files-for-system-and-operation
+  (system operation component source possible-paths)
+  (:documentation "Returns the directory where the componets output files should be placed. This may depends on the system, the operation and the component. The ASDF default input and outputs are provided in the source and possible-paths parameters."))
+(defun source-to-target-resolved-mappings ()
+  "Answer `*source-to-target-mappings*` with additional entries made
+by resolving sources that are symlinks.
+As ASDF sometimes resolves symlinks to compute source paths, we must
+follow that.  For example, if SBCL is installed under a symlink, and
+SBCL_HOME is set through that symlink, the default rule above
+preventing SBCL contribs from being mapped elsewhere will not be
+applied by the plain `*source-to-target-mappings*`."
+  (loop for mapping in asdf:*source-to-target-mappings*
+        for (source target) = mapping
+        for true-source = (and source (resolve-symlinks source))
+        if (equal source true-source)
+          collect mapping
+        else append (list mapping (list true-source target))))
+(defmethod output-files-for-system-and-operation
+           ((system system) operation component source possible-paths)
+  (declare (ignore operation component))
+  (output-files-using-mappings
+   source possible-paths (source-to-target-resolved-mappings)))
+(defmethod output-files-using-mappings (source possible-paths path-mappings)
+  (mapcar
+   (lambda (path)
+     (loop for (from to) in path-mappings
+        when (pathname-prefix-p from source)
+        do (return
+             (if to
+                 (merge-pathnames
+                  (make-pathname :type (pathname-type path))
+                  (merge-pathnames (enough-namestring source from)
+                                   to))
+                 path))
+        finally
+          (return
+            ;; Instead of just returning the path when we
+            ;; don't find a mapping, we stick stuff into
+            ;; the appropriate binary directory based on
+            ;; the implementation
+            (if *centralize-lisp-binaries*
+                (merge-pathnames
+                 (make-pathname
+                  :type (pathname-type path)
+                  :directory `(:relative
+                               ,@(cond ((eq *include-per-user-information* t)
+                                        (cdr (pathname-directory
+                                              (user-homedir-pathname))))
+                                       ((not (null *include-per-user-information*))
+                                        (list *include-per-user-information*)))
+                               ,@(implementation-specific-directory-name)
+                               ,@(rest (pathname-directory path)))
+                  :defaults path)
+                 *default-toplevel-directory*)
+                (make-pathname
+                 :type (pathname-type path)
+                 :directory (append
+                             (pathname-directory path)
+                             (implementation-specific-directory-name))
+                 :defaults path)))))
+          possible-paths))
+(defmethod output-files
+    :around ((operation compile-op) (component source-file))
+  (if (or *map-all-source-files*
+            (typecase component
+              (cl-source-file t)
+              (t nil)))
+    (let ((source (component-pathname component ))
+          (paths (call-next-method)))
+      (output-files-for-system-and-operation
+       (component-system component) operation component source paths))
+    (call-next-method)))
+      (substitute-if
+       #\_ (lambda (x) (find x " /:\\(){}[]$#`'\""))
+       (format nil "~(~@{~a~^-~}~)" lisp version os arch)))))
+;;; ---------------------------------------------------------------------------
+;;; Generic support for configuration files
+(defparameter *inter-directory-separator*
+  #+(or unix cygwin) #\:
+  #-(or unix cygwin) #\;)
+(defun user-homedir ()
+  (truename (user-homedir-pathname)))
+(defun try-directory-subpath (x sub &key type)
+  (let* ((p (and x (ensure-directory-pathname x)))
+         (tp (and p (ignore-errors (truename p))))
+         (sp (and tp (merge-pathnames* (merge-component-name-type sub :type type) p)))
+         (ts (and sp (ignore-errors (truename sp)))))
+    (and ts (values sp ts))))
+(defun user-configuration-directories ()
+  (remove-if
+   #'null
+   (flet ((try (x sub) (try-directory-subpath x sub :type :directory)))
+     `(,(try (getenv "XDG_CONFIG_HOME") "common-lisp/")
+       ,@(loop :with dirs = (getenv "XDG_CONFIG_DIRS")
+           :for dir :in (split-string dirs :separator ":")
+           :collect (try dir "common-lisp/"))
+       #+(and (or win32 windows mswindows mingw32) (not cygwin))
+        ,@`(#+lispworks ,(try (sys:get-folder-path :common-appdata) "common-lisp/config/")
+            ;;; read-windows-registry HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\AppData
+           #+(not cygwin)
+           ,(try (or (getenv "USERPROFILE") (user-homedir))
+                 "Application Data/common-lisp/config/"))
+       ,(try (user-homedir) ".config/common-lisp/")))))
+(defun system-configuration-directories ()
+  (remove-if
+   #'null
+   (append
+    #+(and (or win32 windows mswindows mingw32) (not cygwin))
+    (flet ((try (x sub) (try-directory-subpath x sub :type :directory)))
+      `(,@`(#+lispworks ,(try (sys:get-folder-path :local-appdata) "common-lisp/config/")
+           ;;; read-windows-registry HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\Common AppData
+        ,(try (getenv "ALLUSERSPROFILE") "Application Data/common-lisp/config/"))))
+    (list #p"/etc/"))))
+(defun in-first-directory (dirs x)
+  (loop :for dir :in dirs
+    :thereis (and dir (ignore-errors
+                        (truename (merge-pathnames* x (ensure-directory-pathname dir)))))))
+(defun in-user-configuration-directory (x)
+  (in-first-directory (user-configuration-directories) x))
+(defun in-system-configuration-directory (x)
+  (in-first-directory (system-configuration-directories) x))
+(defun configuration-inheritance-directive-p (x)
+  (let ((kw '(:inherit-configuration :ignore-inherited-configuration)))
+    (or (member x kw)
+        (and (length=n-p x 1) (member (car x) kw)))))
+(defun validate-configuration-form (form tag directive-validator
+                                    &optional (description tag))
+  (unless (and (consp form) (eq (car form) tag))
+    (error "Error: Form doesn't specify ~A ~S~%" description form))
+  (loop :with inherit = 0
+    :for directive :in (cdr form) :do
+    (if (configuration-inheritance-directive-p directive)
+        (incf inherit)
+        (funcall directive-validator directive))
+    :finally
+    (unless (= inherit 1)
+      (error "One and only one of ~S or ~S is required"
+             :inherit-configuration :ignore-inherited-configuration)))
+  form)
+(defun validate-configuration-file (file validator description)
+  (let ((forms (read-file-forms file)))
+    (unless (length=n-p forms 1)
+      (error "One and only one form allowed for ~A. Got: ~S~%" description forms))
+    (funcall validator (car forms))))
+(defun validate-configuration-directory (directory tag validator)
+  (let ((files (sort (ignore-errors
+                       (directory (make-pathname :name :wild :type :wild :defaults directory)
+                                  #+sbcl :resolve-symlinks #+sbcl nil))
+                     #'string< :key #'namestring)))
+    `(,tag
+      ,@(loop :for file :in files :append
+          (mapcar validator (read-file-forms file)))
+      :inherit-configuration)))
+;;; ---------------------------------------------------------------------------
+;;; asdf-output-translations
+;;;
+;;; this code is heavily inspired from
+;;; asdf-binary-translations, common-lisp-controller and cl-launch.
+;;; ---------------------------------------------------------------------------
+(defvar *output-translations* ()
+  "Either NIL (for uninitialized), or a list of one element,
+said element itself being a sorted list of mappings.
+Each mapping is a pair of a source pathname and destination pathname,
+and the order is by decreasing length of namestring of the source pathname.")
+(defvar *user-cache*
+  (or
+   (let ((h (getenv "XDG_CACHE_HOME")))
+     (and h `(,h "common-lisp" :implementation)))
+   #+(and windows lispworks)
+   (let ((h (sys:get-folder-path :common-appdata))) ;; no :common-caches in Windows???
+     (and h `(,h "common-lisp" "cache")))
+   #+(and (or win32 windows mswindows mingw32) (not cygwin))
+   ;;; read-windows-registry HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\Cache
+   (let ((h (or (getenv "USERPROFILE") (user-homedir))))
+     (and h `(,h "Local Settings" "Temporary Internet Files" "common-lisp")))
+   '(:home ".cache" "common-lisp" :implementation)))
+(defvar *system-cache*
+  (or
+   #+(and windows lispworks)
+   (let ((h (sys:get-folder-path :common-appdata))) ;; no :common-caches in Windows???
+     (and h `(,h "common-lisp" "cache")))
+   #+(and (or win32 windows mswindows mingw32) (not cygwin))
+   (let ((h (or (getenv "USERPROFILE") (user-homedir))))
+     (and h `(,h "Local Settings" "Temporary Internet Files" "common-lisp")))
+   #+(or unix cygwin)
+   '("/var/cache/common-lisp" :uid :implementation)))
+(defun output-translations ()
+  (car *output-translations*))
+(defun (setf output-translations) (new-value)
+  (setf *output-translations*
+        (list
+         (stable-sort (copy-list new-value) #'>
+                      :key (lambda (x)
+                             (etypecase (car x)
+                               ((eql t) -1)
+                               (pathname
+                                (length (pathname-directory (car x)))))))))
+  new-value)
+(defun output-translations-initialized-p ()
+  (and *output-translations* t))
+(defun clear-output-translations ()
+  "Undoes any initialization of the output translations.
+You might want to call that before you dump an image that would be resumed
+with a different configuration, so the configuration would be re-read then."
+  (setf *output-translations* '())
+  (values))
+(defparameter *wild-path*
+  (make-pathname :directory '(:relative :wild-inferiors)
+                 :name :wild :type :wild :version :wild))
+(defparameter *wild-asd*
+  (make-pathname :directory '(:relative :wild-inferiors)
+                 :name :wild :type "asd" :version :newest))
+(defun wilden (path)
+  (merge-pathnames* *wild-path* path))
+(defun resolve-absolute-location-component (x wildenp)
+  (let* ((r
+          (etypecase x
+            (pathname x)
+            (string (ensure-directory-pathname x))
+            (cons
+             (let ((car (resolve-absolute-location-component (car x) nil)))
+               (if (null (cdr x))
+                   car
+                   (let ((cdr (resolve-relative-location-component
+                               car (cdr x) wildenp)))
+                     (merge-pathnames* cdr car)))))
+            ((eql :root)
+             ;; special magic! we encode such paths as relative pathnames,
+             ;; but it means "relative to the root of the source pathname's host and device".
+             (return-from resolve-absolute-location-component
+               (make-pathname :directory '(:relative))))
+            ((eql :home) (user-homedir))
+            ((eql :user-cache) (resolve-location *user-cache* nil))
+            ((eql :system-cache) (resolve-location *system-cache* nil))
+            ((eql :current-directory) (current-directory))))
+         (s (if (and wildenp (not (pathnamep x)))
+                (wilden r)
+                r)))
+    (unless (absolute-pathname-p s)
+      (error "Not an absolute pathname ~S" s))
+    s))
+(defun resolve-relative-location-component (super x &optional wildenp)
+  (let* ((r (etypecase x
+              (pathname x)
+              (string x)
+              (cons
+               (let ((car (resolve-relative-location-component super (car x) nil)))
+                 (if (null (cdr x))
+                     car
+                     (let ((cdr (resolve-relative-location-component
+                                 (merge-pathnames* car super) (cdr x) wildenp)))
+                       (merge-pathnames* cdr car)))))
+              ((eql :current-directory)
+               (relativize-pathname-directory (current-directory)))
+              ((eql :implementation) (implementation-identifier))
+              ((eql :implementation-type) (string-downcase (implementation-type)))
+              ((eql :uid) (princ-to-string (get-uid)))))
+         (d (if (pathnamep x) r (ensure-directory-pathname r)))
+         (s (if (and wildenp (not (pathnamep x)))
+                (wilden d)
+                d)))
+    (when (and (absolute-pathname-p s) (not (pathname-match-p s (wilden super))))
+      (error "pathname ~S is not relative to ~S" s super))
+    (merge-pathnames* s super)))
+(defun resolve-location (x &optional wildenp)
+  (if (atom x)
+      (resolve-absolute-location-component x wildenp)
+      (loop :with path = (resolve-absolute-location-component (car x) nil)
+        :for (component . morep) :on (cdr x)
+        :do (setf path (resolve-relative-location-component
+                        path component (and wildenp (not morep))))
+        :finally (return path))))
+(defun location-designator-p (x)
+  (flet ((componentp (c) (typep c '(or string pathname keyword))))
+    (or (typep x 'boolean) (componentp x) (and (consp x) (every #'componentp x)))))
+(defun location-function-p (x)
+  (and
+   (consp x)
+   (length=n-p x 2)
+   (or (and (equal (first x) :function)
+            (typep (second x) 'symbol))
+       (and (equal (first x) 'lambda)
+            (cddr x)
+            (length=n-p (second x) 2)))))
+(defun validate-output-translations-directive (directive)
+  (unless
+      (or (member directive '(:inherit-configuration
+                              :ignore-inherited-configuration
+                              :enable-user-cache :disable-cache))
+          (and (consp directive)
+               (or (and (length=n-p directive 2)
+                        (or (and (eq (first directive) :include)
+                                 (typep (second directive) '(or string pathname null)))
+                            (and (location-designator-p (first directive))
+                                 (or (location-designator-p (second directive))
+                                     (location-function-p (second directive))))))
+                   (and (length=n-p directive 1)
+                        (location-designator-p (first directive))))))
+    (error "Invalid directive ~S~%" directive))
+  directive)
+(defun validate-output-translations-form (form)
+  (validate-configuration-form
+   form
+   :output-translations
+   'validate-output-translations-directive
+   "output translations"))
+(defun validate-output-translations-file (file)
+  (validate-configuration-file
+   file 'validate-output-translations-form "output translations"))
+(defun validate-output-translations-directory (directory)
+  (validate-configuration-directory
+   directory :output-translations 'validate-output-translations-directive))
+(defun parse-output-translations-string (string)
+  (cond
+    ((or (null string) (equal string ""))
+     '(:output-translations :inherit-configuration))
+    ((not (stringp string))
+     (error "environment string isn't: ~S" string))
+    ((eql (char string 0) #\")
+     (parse-output-translations-string (read-from-string string)))
+    ((eql (char string 0) #\()
+     (validate-output-translations-form (read-from-string string)))
+    (t
+     (loop
+      :with inherit = nil
+      :with directives = ()
+      :with start = 0
+      :with end = (length string)
+      :with source = nil
+      :for i = (or (position *inter-directory-separator* string :start start) end) :do
+      (let ((s (subseq string start i)))
+        (cond
+          (source
+           (push (list source (if (equal "" s) nil s)) directives)
+           (setf source nil))
+          ((equal "" s)
+           (when inherit
+             (error "only one inherited configuration allowed: ~S" string))
+           (setf inherit t)
+           (push :inherit-configuration directives))
+          (t
+           (setf source s)))
+        (setf start (1+ i))
+        (when (> start end)
+          (when source
+            (error "Uneven number of components in source to destination mapping ~S" string))
+          (unless inherit
+            (push :ignore-inherited-configuration directives))
+          (return `(:output-translations ,@(nreverse directives)))))))))
+(defparameter *default-output-translations*
+  '(environment-output-translations
+    user-output-translations-pathname
+    user-output-translations-directory-pathname
+    system-output-translations-pathname
+    system-output-translations-directory-pathname))
+(defun wrapping-output-translations ()
+  `(:output-translations
+    ;; Some implementations have precompiled ASDF systems,
+    ;; so we must disable translations for implementation paths.
+    #+sbcl (,(getenv "SBCL_HOME") ())
+    #+ecl (,(translate-logical-pathname "SYS:**;*.*") ()) ; only needed if LPNs are resolved manually.
+    #+clozure (,(wilden (ccl::ccl-directory)) ()) ; not needed: no precompiled ASDF system
+    ;; All-import, here is where we want user stuff to be:
+    :inherit-configuration
+    ;; These are for convenience, and can be overridden by the user:
+    #+abcl (#p"/___jar___file___root___/**/*.*" (:user-cache #p"**/*.*"))
+    #+abcl (#p"jar:file:/**/*.jar!/**/*.*" (:function translate-jar-pathname))
+    ;; If we want to enable the user cache by default, here would be the place:
+    :enable-user-cache))
+(defparameter *output-translations-file* #p"asdf-output-translations.conf")
+(defparameter *output-translations-directory* #p"asdf-output-translations.conf.d/")
+(defun user-output-translations-pathname ()
+  (in-user-configuration-directory *output-translations-file* ))
+(defun system-output-translations-pathname ()
+  (in-system-configuration-directory *output-translations-file*))
+(defun user-output-translations-directory-pathname ()
+  (in-user-configuration-directory *output-translations-directory*))
+(defun system-output-translations-directory-pathname ()
+  (in-system-configuration-directory *output-translations-directory*))
+(defun environment-output-translations ()
+  (getenv "ASDF_OUTPUT_TRANSLATIONS"))
+(defgeneric process-output-translations (spec &key inherit collect))
+(defmethod process-output-translations ((x symbol) &key
+                                        (inherit *default-output-translations*)
+                                        collect)
+  (process-output-translations (funcall x) :inherit inherit :collect collect))
+(defmethod process-output-translations ((pathname pathname) &key inherit collect)
+  (cond
+    ((directory-pathname-p pathname)
+     (process-output-translations (validate-output-translations-directory pathname)
+                                  :inherit inherit :collect collect))
+    ((probe-file pathname)
+     (process-output-translations (validate-output-translations-file pathname)
+                                  :inherit inherit :collect collect))
+    (t
+     (inherit-output-translations inherit :collect collect))))
+(defmethod process-output-translations ((string string) &key inherit collect)
+  (process-output-translations (parse-output-translations-string string)
+                               :inherit inherit :collect collect))
+(defmethod process-output-translations ((x null) &key inherit collect)
+  (declare (ignorable x))
+  (inherit-output-translations inherit :collect collect))
+(defmethod process-output-translations ((form cons) &key inherit collect)
+  (dolist (directive (cdr (validate-output-translations-form form)))
+    (process-output-translations-directive directive :inherit inherit :collect collect)))
+(defun inherit-output-translations (inherit &key collect)
+  (when inherit
+    (process-output-translations (first inherit) :collect collect :inherit (rest inherit))))
+(defun process-output-translations-directive (directive &key inherit collect)
+  (if (atom directive)
+      (ecase directive
+        ((:enable-user-cache)
+         (process-output-translations-directive '(t :user-cache) :collect collect))
+        ((:disable-cache)
+         (process-output-translations-directive '(t t) :collect collect))
+        ((:inherit-configuration)
+         (inherit-output-translations inherit :collect collect))
+        ((:ignore-inherited-configuration)
+         nil))
+      (let ((src (first directive))
+            (dst (second directive)))
+        (if (eq src :include)
+            (when dst
+              (process-output-translations (pathname dst) :inherit nil :collect collect))
+            (when src
+              (let ((trusrc (or (eql src t)
+                                (let ((loc (resolve-location src t)))
+                                  (if (absolute-pathname-p loc) (truenamize loc) loc)))))
+                (cond
+                  ((location-function-p dst)
+                   (funcall collect
+                            (list trusrc
+                                  (if (symbolp (second dst))
+                                      (fdefinition (second dst))
+                                      (eval (second dst))))))
+                  ((eq dst t)
+                   (funcall collect (list trusrc t)))
+                  (t
+                   (let* ((trudst (make-pathname
+                                   :defaults (if dst (resolve-location dst t) trusrc)))
+                          (wilddst (make-pathname
+                                    :name :wild :type :wild :version :wild
+                                    :defaults trudst)))
+                     (funcall collect (list wilddst t))
+                     (funcall collect (list trusrc trudst)))))))))))
+(defun compute-output-translations (&optional parameter)
+  "read the configuration, return it"
+  (remove-duplicates
+   (while-collecting (c)
+     (inherit-output-translations
+      `(wrapping-output-translations ,parameter ,@*default-output-translations*) :collect #'c))
+   :test 'equal :from-end t))
+(defun initialize-output-translations (&optional parameter)
+  "read the configuration, initialize the internal configuration variable,
+return the configuration"
+  (setf (output-translations) (compute-output-translations parameter)))
+(defun disable-output-translations ()
+  "Initialize output translations in a way that maps every file to itself,
+effectively disabling the output translation facility."
+  (initialize-output-translations
+   '(:output-translations :disable-cache :ignore-inherited-configuration)))
+;; checks an initial variable to see whether the state is initialized
+;; or cleared. In the former case, return current configuration; in
+;; the latter, initialize.  ASDF will call this function at the start
+;; of (asdf:find-system).
+(defun ensure-output-translations ()
+  (if (output-translations-initialized-p)
+      (output-translations)
+      (initialize-output-translations)))
+(defun apply-output-translations (path)
+  (etypecase path
+    (logical-pathname
+     path)
+    ((or pathname string)
+     (ensure-output-translations)
+     (loop :with p = (truenamize path)
+       :for (source destination) :in (car *output-translations*)
+       :for root = (when (or (eq source t)
+                             (and (pathnamep source)
+                                  (not (absolute-pathname-p source))))
+                     (pathname-root p))
+       :for absolute-source = (cond
+                                ((eq source t) (wilden root))
+                                (root (merge-pathnames* source root))
+                                (t source))
+       :when (or (eq source t) (pathname-match-p p absolute-source))
+       :return
+       (cond
+         ((functionp destination)
+          (funcall destination p absolute-source))
+         ((eq destination t)
+          p)
+         ((not (pathnamep destination))
+          (error "invalid destination"))
+         ((not (absolute-pathname-p destination))
+          (translate-pathname p absolute-source (merge-pathnames* destination root)))
+         (root
+          (translate-pathname (directorize-pathname-host-device p) absolute-source destination))
+         (t
+          (translate-pathname p absolute-source destination)))
+       :finally (return p)))))
+(defun last-char (s)
+  (and (stringp s) (plusp (length s)) (char s (1- (length s)))))
+(defun directorize-pathname-host-device (pathname)
+  (let* ((root (pathname-root pathname))
+         (wild-root (wilden root))
+         (absolute-pathname (merge-pathnames* pathname root))
+         (foo (make-pathname :directory '(:absolute "FOO") :defaults root))
+         (separator (last-char (namestring foo)))
+         (root-namestring (namestring root))
+         (root-string
+          (substitute-if #\/
+                         (lambda (x) (or (eql x #\:)
+                                         (eql x separator)))
+                         root-namestring)))
+    (multiple-value-bind (relative path filename)
+        (component-name-to-pathname-components root-string t)
+      (declare (ignore relative filename))
+      (let ((new-base
+             (make-pathname :defaults root
+                            :directory `(:absolute ,@path))))
+        (translate-pathname absolute-pathname wild-root (wilden new-base))))))
+(defmethod output-files :around (operation component)
+  "Translate output files, unless asked not to"
+  (declare (ignorable operation component))
+  (values
+   (multiple-value-bind (files fixedp) (call-next-method)
+     (if fixedp
+         files
+         (mapcar #'apply-output-translations files)))
+   t))
+(defun compile-file-pathname* (input-file &rest keys)
+  (apply-output-translations
+   (apply #'compile-file-pathname
+          (truenamize (lispize-pathname input-file))
+          keys)))
+#+abcl
+(defun translate-jar-pathname (source wildcard)
+  (declare (ignore wildcard))
+  (let* ((p (pathname (first (pathname-device source))))
+         (root (format nil "/___jar___file___root___/~@[~A/~]"
+                       (and (find :windows *features*)
+                            (pathname-device p)))))
+    (apply-output-translations
+     (merge-pathnames*
+      (relativize-pathname-directory source)
+      (merge-pathnames*
+       (relativize-pathname-directory (ensure-directory-pathname p))
+       root)))))
+;;;; -----------------------------------------------------------------
+;;;; Compatibility mode for ASDF-Binary-Locations
+(defun enable-asdf-binary-locations-compatibility
+    (&key
+     (centralize-lisp-binaries nil)
+     (default-toplevel-directory
+         ;; Use ".cache/common-lisp" instead ???
+         (merge-pathnames* (make-pathname :directory '(:relative ".fasls"))
+                           (user-homedir)))
+     (include-per-user-information nil)
+     (map-all-source-files nil)
+     (source-to-target-mappings nil))
+  (let* ((fasl-type (pathname-type (compile-file-pathname "foo.lisp")))
+         (wild-inferiors (make-pathname :directory '(:relative :wild-inferiors)))
+         (mapped-files (make-pathname
+                        :name :wild :version :wild
+                        :type (if map-all-source-files :wild fasl-type)))
+         (destination-directory
+          (if centralize-lisp-binaries
+              `(,default-toplevel-directory
+                ,@(when include-per-user-information
+                        (cdr (pathname-directory (user-homedir))))
+                :implementation ,wild-inferiors)
+              `(:root ,wild-inferiors :implementation))))
+    (initialize-output-translations
+     `(:output-translations
+       ,@source-to-target-mappings
+       ((:root ,wild-inferiors ,mapped-files)
+        (,@destination-directory ,mapped-files))
+       (t t)
+       :ignore-inherited-configuration))))
 ;;;; -----------------------------------------------------------------
 …
 ;;;; Jesse Hager: The Windows Shortcut File Format.
 ;;;; http://www.wotsit.org/list.asp?fc=13
-;;;; -----------------------------------------------------------------
 (defparameter *link-initial-dword* 76)
 …
 (defun read-null-terminated-string (s)
   (with-output-to-string (out)
+    (loop
+        for code = (read-byte s)
+        until (zerop code)
+        do (write-char (code-char code) out))))
+    (loop :for code = (read-byte s)
+      :until (zerop code)
+      :do (write-char (code-char code) out))))
 (defun read-little-endian (s &optional (bytes 4))
+  (let ((result 0))
+    (loop
+        for i from 0 below bytes
+        do
+          (setf result (logior result (ash (read-byte s) (* 8 i)))))
+    result))
+  (loop
+    :for i :from 0 :below bytes
+    :sum (ash (read-byte s) (* 8 i))))
+(defun parse-file-location-info (s)
+  (let ((start (file-position s))
+        (total-length (read-little-endian s))
+        (end-of-header (read-little-endian s))
+        (fli-flags (read-little-endian s))
+        (local-volume-offset (read-little-endian s))
+        (local-offset (read-little-endian s))
+        (network-volume-offset (read-little-endian s))
+        (remaining-offset (read-little-endian s)))
+    (declare (ignore total-length end-of-header local-volume-offset))
+    (unless (zerop fli-flags)
+      (cond
+        ((logbitp 0 fli-flags)
+          (file-position s (+ start local-offset)))
+        ((logbitp 1 fli-flags)
+          (file-position s (+ start
+                              network-volume-offset
+                              #x14))))
+      (concatenate 'string
+        (read-null-terminated-string s)
+        (progn
+          (file-position s (+ start remaining-offset))
+          (read-null-terminated-string s))))))
 (defun parse-windows-shortcut (pathname)
   (with-open-file (s pathname :element-type '(unsigned-byte 8))
     (handler-case
         (when (and (= (read-little-endian s) *link-initial-dword*)
                    (let ((header (make-array (length *link-guid*))))
                      (read-sequence header s)
                      (equalp header *link-guid*)))
           (let ((flags (read-little-endian s)))
             (file-position s 76)        ;skip rest of header
             (when (logbitp 0 flags)
               ;; skip shell item id list
               (let ((length (read-little-endian s 2)))
                 (file-position s (+ length (file-position s)))))
             (cond
               ((logbitp 1 flags)
                 (parse-file-location-info s))
               (t
                 (when (logbitp 2 flags)
                   ;; skip description string
                   (let ((length (read-little-endian s 2)))
                     (file-position s (+ length (file-position s)))))
                 (when (logbitp 3 flags)
                   ;; finally, our pathname
                   (let* ((length (read-little-endian s 2))
                          (buffer (make-array length)))
                     (read-sequence buffer s)
                     (map 'string #'code-char buffer)))))))
+        (when (and (= (read-little-endian s) *link-initial-dword*)
+                   (let ((header (make-array (length *link-guid*))))
+                     (read-sequence header s)
+                     (equalp header *link-guid*)))
+          (let ((flags (read-little-endian s)))
+            (file-position s 76)        ;skip rest of header
+            (when (logbitp 0 flags)
+              ;; skip shell item id list
+              (let ((length (read-little-endian s 2)))
+                (file-position s (+ length (file-position s)))))
+            (cond
+              ((logbitp 1 flags)
+                (parse-file-location-info s))
+              (t
+                (when (logbitp 2 flags)
+                  ;; skip description string
+                  (let ((length (read-little-endian s 2)))
+                    (file-position s (+ length (file-position s)))))
+                (when (logbitp 3 flags)
+                  ;; finally, our pathname
+                  (let* ((length (read-little-endian s 2))
+                         (buffer (make-array length)))
+                    (read-sequence buffer s)
+                    (map 'string #'code-char buffer)))))))
       (end-of-file ()
+        nil))))
+(defun parse-file-location-info (s)
+  (let ((start (file-position s))
+        (total-length (read-little-endian s))
+        (end-of-header (read-little-endian s))
+        (fli-flags (read-little-endian s))
+        (local-volume-offset (read-little-endian s))
+        (local-offset (read-little-endian s))
+        (network-volume-offset (read-little-endian s))
+        (remaining-offset (read-little-endian s)))
+    (declare (ignore total-length end-of-header local-volume-offset))
+    (unless (zerop fli-flags)
+      (cond
+        ((logbitp 0 fli-flags)
+          (file-position s (+ start local-offset)))
+        ((logbitp 1 fli-flags)
+          (file-position s (+ start
+                              network-volume-offset
+                              #x14))))
+      (concatenate 'string
+        (read-null-terminated-string s)
+        (progn
+          (file-position s (+ start remaining-offset))
+          (read-null-terminated-string s))))))
+(pushnew :asdf *features*)
+#+sbcl
+(eval-when (:compile-toplevel :load-toplevel :execute)
+  (when (sb-ext:posix-getenv "SBCL_BUILDING_CONTRIB")
+    (pushnew :sbcl-hooks-require *features*)))
+#+(and sbcl sbcl-hooks-require)
+        nil))))
+;;;; -----------------------------------------------------------------
+;;;; Source Registry Configuration, by Francois-Rene Rideau
+;;;; See the Manual and https://bugs.launchpad.net/asdf/+bug/485918
+;; Using ack 1.2 exclusions
+(defvar *default-exclusions*
+  '(".bzr" ".cdv" "~.dep" "~.dot" "~.nib" "~.plst"
+    ".git" ".hg" ".pc" ".svn" "CVS" "RCS" "SCCS" "_darcs"
+    "_sgbak" "autom4te.cache" "cover_db" "_build"))
+(defvar *source-registry* ()
+  "Either NIL (for uninitialized), or a list of one element,
+said element itself being a list of directory pathnames where to look for .asd files")
+(defun source-registry ()
+  (car *source-registry*))
+(defun (setf source-registry) (new-value)
+  (setf *source-registry* (list new-value))
+  new-value)
+(defun source-registry-initialized-p ()
+  (and *source-registry* t))
+(defun clear-source-registry ()
+  "Undoes any initialization of the source registry.
+You might want to call that before you dump an image that would be resumed
+with a different configuration, so the configuration would be re-read then."
+  (setf *source-registry* '())
+  (values))
+(defun probe-asd (name defaults)
+  (block nil
+    (when (directory-pathname-p defaults)
+      (let ((file
+             (make-pathname
+              :defaults defaults :version :newest :case :local
+              :name name
+              :type "asd")))
+        (when (probe-file file)
+          (return file)))
+      #+(and (or win32 windows mswindows mingw32) (not cygwin) (not clisp))
+      (let ((shortcut
+             (make-pathname
+              :defaults defaults :version :newest :case :local
+              :name (concatenate 'string name ".asd")
+              :type "lnk")))
+        (when (probe-file shortcut)
+          (let ((target (parse-windows-shortcut shortcut)))
+            (when target
+              (return (pathname target)))))))))
+(defun sysdef-source-registry-search (system)
+  (ensure-source-registry)
+  (loop :with name = (coerce-name system)
+    :for defaults :in (source-registry)
+    :for file = (probe-asd name defaults)
+    :when file :return file))
+(defun validate-source-registry-directive (directive)
+  (unless
+      (or (member directive '(:default-registry (:default-registry)) :test 'equal)
+          (destructuring-bind (kw &rest rest) directive
+            (case kw
+              ((:include :directory :tree)
+               (and (length=n-p rest 1)
+                    (typep (car rest) '(or pathname string null))))
+              ((:exclude)
+               (every #'stringp rest))
+              (null rest))))
+    (error "Invalid directive ~S~%" directive))
+  directive)
+(defun validate-source-registry-form (form)
+  (validate-configuration-form
+   form :source-registry 'validate-source-registry-directive "a source registry"))
+(defun validate-source-registry-file (file)
+  (validate-configuration-file
+   file 'validate-source-registry-form "a source registry"))
+(defun validate-source-registry-directory (directory)
+  (validate-configuration-directory
+   directory :source-registry 'validate-source-registry-directive))
+(defun parse-source-registry-string (string)
+  (cond
+    ((or (null string) (equal string ""))
+     '(:source-registry :inherit-configuration))
+    ((not (stringp string))
+     (error "environment string isn't: ~S" string))
+    ((find (char string 0) "\"(")
+     (validate-source-registry-form (read-from-string string)))
+    (t
+     (loop
+      :with inherit = nil
+      :with directives = ()
+      :with start = 0
+      :with end = (length string)
+      :for pos = (position *inter-directory-separator* string :start start) :do
+      (let ((s (subseq string start (or pos end))))
+        (cond
+         ((equal "" s) ; empty element: inherit
+          (when inherit
+            (error "only one inherited configuration allowed: ~S" string))
+          (setf inherit t)
+          (push ':inherit-configuration directives))
+         ((ends-with s "//")
+          (push `(:tree ,(subseq s 0 (1- (length s)))) directives))
+         (t
+          (push `(:directory ,s) directives)))
+        (cond
+          (pos
+           (setf start (1+ pos)))
+          (t
+           (unless inherit
+             (push '(:ignore-inherited-configuration) directives))
+           (return `(:source-registry ,@(nreverse directives))))))))))
+(defun register-asd-directory (directory &key recurse exclude collect)
+  (if (not recurse)
+      (funcall collect directory)
+      (let* ((files
+              (handler-case
+                  (directory (merge-pathnames* *wild-asd* directory)
+                             #+sbcl #+sbcl :resolve-symlinks nil
+                             #+clisp #+clisp :circle t)
+                (error (c)
+                  (warn "Error while scanning system definitions under directory ~S:~%~A"
+                        directory c)
+                  nil)))
+             (dirs (remove-duplicates (mapcar #'pathname-directory-pathname files)
+                                      :test #'equal :from-end t)))
+        (loop
+          :for dir :in dirs
+          :unless (loop :for x :in exclude
+                    :thereis (find x (pathname-directory dir) :test #'equal))
+          :do (funcall collect dir)))))
+(defparameter *default-source-registries*
+  '(environment-source-registry
+    user-source-registry
+    user-source-registry-directory
+    system-source-registry
+    system-source-registry-directory
+    default-source-registry))
+(defparameter *source-registry-file* #p"source-registry.conf")
+(defparameter *source-registry-directory* #p"source-registry.conf.d/")
+(defun wrapping-source-registry ()
+  `(:source-registry
+    #+sbcl (:tree ,(getenv "SBCL_HOME"))
+   :inherit-configuration))
+(defun default-source-registry ()
+  (flet ((try (x sub) (try-directory-subpath x sub :type :directory)))
+    `(:source-registry
+      #+sbcl (:directory ,(merge-pathnames* ".sbcl/systems/" (user-homedir)))
+      (:directory ,(truenamize (directory-namestring *default-pathname-defaults*)))
+      ,@(let*
+         #+(or unix cygwin)
+         ((datahome
+           (or (getenv "XDG_DATA_HOME")
+               (try (user-homedir) ".local/share/")))
+          (datadirs
+           (or (getenv "XDG_DATA_DIRS") "/usr/local/share:/usr/share"))
+          (dirs (cons datahome (split-string datadirs :separator ":"))))
+         #+(and (or win32 windows mswindows mingw32) (not cygwin))
+         ((datahome
+           #+lispworks (sys:get-folder-path :common-appdata)
+           #-lispworks (try (or (getenv "USERPROFILE") (user-homedir))
+                            "Application Data"))
+          (datadir
+           #+lispworks (sys:get-folder-path :local-appdata)
+           #-lispworks (try (getenv "ALLUSERSPROFILE")
+                            "Application Data"))
+          (dirs (list datahome datadir)))
+         #-(or unix win32 windows mswindows mingw32 cygwin)
+         ((dirs ()))
+         (loop :for dir :in dirs
+           :collect `(:directory ,(try dir "common-lisp/systems/"))
+           :collect `(:tree ,(try dir "common-lisp/source/"))))
+      :inherit-configuration)))
+(defun user-source-registry ()
+  (in-user-configuration-directory *source-registry-file*))
+(defun system-source-registry ()
+  (in-system-configuration-directory *source-registry-file*))
+(defun user-source-registry-directory ()
+  (in-user-configuration-directory *source-registry-directory*))
+(defun system-source-registry-directory ()
+  (in-system-configuration-directory *source-registry-directory*))
+(defun environment-source-registry ()
+  (getenv "CL_SOURCE_REGISTRY"))
+(defgeneric process-source-registry (spec &key inherit register))
+(defmethod process-source-registry ((x symbol) &key inherit register)
+  (process-source-registry (funcall x) :inherit inherit :register register))
+(defmethod process-source-registry ((pathname pathname) &key inherit register)
+  (cond
+    ((directory-pathname-p pathname)
+     (process-source-registry (validate-source-registry-directory pathname)
+                              :inherit inherit :register register))
+    ((probe-file pathname)
+     (process-source-registry (validate-source-registry-file pathname)
+                              :inherit inherit :register register))
+    (t
+     (inherit-source-registry inherit :register register))))
+(defmethod process-source-registry ((string string) &key inherit register)
+  (process-source-registry (parse-source-registry-string string)
+                           :inherit inherit :register register))
+(defmethod process-source-registry ((x null) &key inherit register)
+  (declare (ignorable x))
+  (inherit-source-registry inherit :register register))
+(defmethod process-source-registry ((form cons) &key inherit register)
+  (let ((*default-exclusions* *default-exclusions*))
+    (dolist (directive (cdr (validate-source-registry-form form)))
+      (process-source-registry-directive directive :inherit inherit :register register))))
+(defun inherit-source-registry (inherit &key register)
+  (when inherit
+    (process-source-registry (first inherit) :register register :inherit (rest inherit))))
+(defun process-source-registry-directive (directive &key inherit register)
+  (destructuring-bind (kw &rest rest) (if (consp directive) directive (list directive))
+    (ecase kw
+      ((:include)
+       (destructuring-bind (pathname) rest
+         (process-source-registry (pathname pathname) :inherit nil :register register)))
+      ((:directory)
+       (destructuring-bind (pathname) rest
+         (when pathname
+           (funcall register (ensure-directory-pathname pathname)))))
+      ((:tree)
+       (destructuring-bind (pathname) rest
+         (when pathname
+           (funcall register (ensure-directory-pathname pathname) :recurse t :exclude *default-exclusions*))))
+      ((:exclude)
+       (setf *default-exclusions* rest))
+      ((:default-registry)
+       (inherit-source-registry '(default-source-registry) :register register))
+      ((:inherit-configuration)
+       (inherit-source-registry inherit :register register))
+      ((:ignore-inherited-configuration)
+       nil))))
+(defun flatten-source-registry (&optional parameter)
+  (remove-duplicates
+   (while-collecting (collect)
+     (inherit-source-registry
+      `(wrapping-source-registry
+        ,parameter
+        ,@*default-source-registries*)
+      :register (lambda (directory &key recurse exclude)
+                  (collect (list directory :recurse recurse :exclude exclude)))))
+   :test 'equal :from-end t))
+;; Will read the configuration and initialize all internal variables,
+;; and return the new configuration.
+(defun compute-source-registry (&optional parameter)
+  (while-collecting (collect)
+    (dolist (entry (flatten-source-registry parameter))
+      (destructuring-bind (directory &key recurse exclude) entry
+        (register-asd-directory
+         directory
+         :recurse recurse :exclude exclude :collect #'collect)))))
+(defun initialize-source-registry (&optional parameter)
+  (setf (source-registry) (compute-source-registry parameter)))
+;; checks an initial variable to see whether the state is initialized
+;; or cleared. In the former case, return current configuration; in
+;; the latter, initialize.  ASDF will call this function at the start
+;; of (asdf:find-system).
+(defun ensure-source-registry ()
+  (if (source-registry-initialized-p)
+      (source-registry)
+      (initialize-source-registry)))
+;;;; -----------------------------------------------------------------
+;;;; Hook into REQUIRE for SBCL, ClozureCL and ABCL
+;;;;
+#+(or sbcl clozure abcl)
 (progn
   (defun module-provide-asdf (name)
+    (handler-bind ((style-warning #'muffle-warning))
+    (handler-bind
+        ((style-warning #'muffle-warning)
+         (missing-component (constantly nil))
+         (error (lambda (e)
+                  (format *error-output* "ASDF could not load ~A because ~A.~%"
+                          name e))))
       (let* ((*verbose-out* (make-broadcast-stream))
              (system (asdf:find-system name nil)))
+             (system (find-system name nil)))
         (when system
           (asdf:operate 'asdf:load-op name)
+          (load-system name)
           t))))
+  (defun contrib-sysdef-search (system)
+    (let ((home (sb-ext:posix-getenv "SBCL_HOME")))
+      (when (and home (not (string= home "")))
+        (let* ((name (coerce-name system))
+               (home (truename home))
+               (contrib (merge-pathnames
+                         (make-pathname :directory `(:relative ,name)
+                                        :name name
+                                        :type "asd"
+                                        :case :local
+                                        :version :newest)
+                         home)))
+          (probe-file contrib)))))
+  (pushnew
+   '(let ((home (sb-ext:posix-getenv "SBCL_HOME")))
+      (when (and home (not (string= home "")))
+        (merge-pathnames "site-systems/" (truename home))))
+   *central-registry*)
+  (pushnew
+   '(merge-pathnames ".sbcl/systems/"
+     (user-homedir-pathname))
+   *central-registry*)
+  (pushnew 'module-provide-asdf sb-ext:*module-provider-functions*)
+  (pushnew 'contrib-sysdef-search *system-definition-search-functions*))
+(if *asdf-revision*
+    (asdf-message ";; ASDF, revision ~a" *asdf-revision*)
+    (asdf-message ";; ASDF, revision unknown; possibly a development version"))
+(provide 'asdf)
+#+(or)
+;;?? ignore -- so how will ABL get "installed"
+;; should be unnecessary with newer versions of ASDF
+;; load customizations
+(eval-when (:load-toplevel :execute)
+  (let* ((*package* (find-package :common-lisp)))
+    (load
+     (merge-pathnames
+      (make-pathname :name "asdf-binary-locations"
+                     :type "lisp"
+                     :directory '(:relative ".asdf"))
+      (truename (user-homedir-pathname)))
+     :if-does-not-exist nil)))
+  (pushnew 'module-provide-asdf
+           #+sbcl sb-ext:*module-provider-functions*
+           #+clozure ccl::*module-provider-functions*
+           #+abcl sys::*module-provider-functions*))
+;;;; -------------------------------------------------------------------------
+;;;; Cleanups after hot-upgrade.
+;;;; Things to do in case we're upgrading from a previous version of ASDF.
+;;;; See https://bugs.launchpad.net/asdf/+bug/485687
+;;;;
+;;;; TODO: debug why it's not enough to upgrade from ECL <= 9.11.1
+(eval-when (:compile-toplevel :load-toplevel :execute)
+  #+ecl ;; Support upgrade from before ECL went to 1.369
+  (when (fboundp 'compile-op-system-p)
+    (defmethod compile-op-system-p ((op compile-op))
+      (getf :system-p (compile-op-flags op)))
+    (defmethod initialize-instance :after ((op compile-op)
+                                           &rest initargs
+                                           &key system-p &allow-other-keys)
+      (declare (ignorable initargs))
+      (when system-p (appendf (compile-op-flags op) (list :system-p system-p))))))
+;;;; -----------------------------------------------------------------
+;;;; Done!
+(when *load-verbose*
+  (asdf-message ";; ASDF, version ~a" (asdf-version)))
+#+allegro
+(eval-when (:compile-toplevel :execute)
+  (when (boundp 'excl:*warn-on-nested-reader-conditionals*)
+    (setf excl:*warn-on-nested-reader-conditionals* *acl-warn-save*)))
+(pushnew :asdf *features*)
+;; this is a release candidate for ASDF 2.0
+(pushnew :asdf2 *features*)
+(provide :asdf)
+;;; Local Variables:
+;;; mode: lisp
+;;; End:

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