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				  (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))
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      (visit-component operation c (and forced t))
      forced)))
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(defmethod perform ((operation operation) (c source-file))
   "~@<required method PERFORM not implemented ~
    for operation ~A, component ~A~@:>"
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   (class-of operation) (class-of c)))

(defmethod perform ((operation operation) (c module))
  nil)

(defmethod explain ((operation operation) (component component))
  (asdf-message "~&;;; ~A on ~A~%" operation component))
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(defclass compile-op (operation)
  ((proclamations :initarg :proclamations :accessor compile-op-proclamations :initform nil)
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   (on-warnings :initarg :on-warnings :accessor operation-on-warnings
                :initform *compile-file-warnings-behaviour*)
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   (on-failure :initarg :on-failure :accessor operation-on-failure
               :initform *compile-file-failure-behaviour*)))

(defmethod perform :before ((operation compile-op) (c source-file))
  (map nil #'ensure-directories-exist (output-files operation c)))
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(defmethod perform :after ((operation operation) (c component))
  (setf (gethash (type-of operation) (component-operation-times c))
        (get-universal-time)))
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;;; perform is required to check output-files to find out where to put
;;; its answers, in case it has been overridden for site policy
(defmethod perform ((operation compile-op) (c cl-source-file))
  #-:broken-fasl-loader
  (let ((source-file (component-pathname c))
        (output-file (car (output-files operation c))))
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    (multiple-value-bind (output warnings-p failure-p)
        (compile-file source-file :output-file output-file)
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      (when warnings-p
        (case (operation-on-warnings operation)
          (:warn (warn
                  "~@<COMPILE-FILE warned while performing ~A on ~A.~@:>"
                  operation c))
          (:error (error 'compile-warned :component c :operation operation))
          (:ignore nil)))
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      (when failure-p
        (case (operation-on-failure operation)
          (:warn (warn
                  "~@<COMPILE-FILE failed while performing ~A on ~A.~@:>"
                  operation c))
          (:error (error 'compile-failed :component c :operation operation))
          (:ignore nil)))
        (error 'compile-error :component c :operation operation)))))
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(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)))
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(defmethod perform ((operation compile-op) (c static-file))
  nil)

(defmethod output-files ((operation compile-op) (c static-file))
  nil)

(defmethod input-files ((op compile-op) (c static-file))
  nil)


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(defclass basic-load-op (operation) ())

(defclass load-op (basic-load-op) ())
(defmethod perform ((o load-op) (c cl-source-file))
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  (mapcar #'load (input-files o c)))
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(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)))))))

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(defmethod perform ((operation load-op) (c static-file))
  nil)
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(defmethod operation-done-p ((operation load-op) (c static-file))
  t)
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(defmethod output-files ((o operation) (c component))
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  nil)
(defmethod component-depends-on ((operation load-op) (c component))
  (cons (list 'compile-op (component-name c))
        (call-next-method)))

(defclass load-source-op (basic-load-op) ())

(defmethod perform ((o load-source-op) (c cl-source-file))
  (let ((source (component-pathname c)))
    (setf (component-property c 'last-loaded-as-source)
          (and (load source)
               (get-universal-time)))))

(defmethod perform ((operation load-source-op) (c static-file))
  nil)

(defmethod output-files ((operation load-source-op) (c component))
  nil)

;;; FIXME: we simply copy load-op's dependencies.  this is Just Not Right.
(defmethod component-depends-on ((o load-source-op) (c component))
  (let ((what-would-load-op-do (cdr (assoc 'load-op
                                           (slot-value c 'in-order-to)))))
    (mapcar (lambda (dep)
              (if (eq (car dep) 'load-op)
                  (cons 'load-source-op (cdr dep))
                  dep))
            what-would-load-op-do)))

(defmethod operation-done-p ((o load-source-op) (c source-file))
  (if (or (not (component-property c 'last-loaded-as-source))
          (> (file-write-date (component-pathname c))
             (component-property c 'last-loaded-as-source)))
(defclass test-op (operation) ())

(defmethod perform ((operation test-op) (c component))
  nil)
(defmethod operation-done-p ((operation test-op) (c system))
  "Testing a system is _never_ done."
  nil)

(defmethod component-depends-on :around ((o test-op) (c system))
  (cons `(load-op ,(component-name c)) (call-next-method)))


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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; invoking operations

(defun operate (operation-class system &rest args &key (verbose t) version force
                &allow-other-keys)
  (declare (ignore force))
  (let* ((*package* *package*)
         (*readtable* *readtable*)
         (op (apply #'make-instance operation-class
                    :original-initargs args
                    args))
         (*verbose-out* (if verbose *standard-output* (make-broadcast-stream)))
         (system (if (typep system 'component) system (find-system system))))
    (unless (version-satisfies system version)
      (error 'missing-component-of-version :requires system :version 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 ~
                                   having been successful.~@:>"
                                 op component))
                       (setf (gethash (type-of op)
                                      (component-operation-times component))
                             (get-universal-time))
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                       (return)))))))
    op))
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(defun oos (operation-class system &rest args &key force (verbose t) version
	    &allow-other-keys)
  (declare (ignore force verbose version))
  (apply #'operate operation-class system args))

(let ((operate-docstring
  "Operate does three things:

1. It creates an instance of `operation-class` using any keyword parameters
as initargs.
2. It finds the  asdf-system specified by `system` (possibly loading
it from disk).
3. It then calls `traverse` with the operation and system as arguments

The traverse operation is wrapped in `with-compilation-unit` and error
handling code. If a `version` argument is supplied, then operate also
ensures that the system found satisfies it using the `version-satisfies`
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method.

Note that dependencies may cause the operation to invoke other
operations on the system or its components: the new operations will be
created with the same initargs as the original one.
"))
  (setf (documentation 'oos 'function)
	(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."
  (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."
  (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."
  (declare (ignore force verbose version))
  (apply #'operate 'test-op system args))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; 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))))))))
(defun resolve-symlinks (path)
  #-allegro (truename path)
  #+allegro (excl:pathname-resolve-symbolic-links path)
  )

(defun determine-system-pathname (pathname pathname-supplied-p)
  ;; called from the defsystem macro.
  ;; the pathname of a system is either
  ;; 1. the one supplied, 
  ;; 2. derived from the *load-truename* (see below), or
  ;; 3. taken from *default-pathname-defaults*
  ;;
  ;; if using *load-truename*, then we also deal with whether or not
  ;; to resolve symbolic links. If not resolving symlinks, then we use
  ;; *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*))

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(defmacro defsystem (name &body options)
  (destructuring-bind (&key (pathname nil pathname-arg-p) (class 'system)
                            &allow-other-keys)
    (let ((component-options (remove-keyword :class options)))
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      `(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
         (let ((s (system-registered-p ',name)))
           (cond ((and s (eq (type-of (cdr s)) ',class))
                  (setf (car s) (get-universal-time)))
                 (s
                  (change-class (cdr s) ',class))
                 (t
                  (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))))))

(defun class-for-type (parent type)
  (let* ((extra-symbols (list (find-symbol (symbol-name type) *package*)
                              (find-symbol (symbol-name type)
                                            (package-name :asdf)))))
         (class (dolist (symbol (if (keywordp type)
                                    extra-symbols
                                    (cons type extra-symbols)))
                  (when (and symbol
                             (find-class symbol nil)
                             (subtypep symbol 'component))
                    (return (find-class symbol))))))
        (and (eq type :file)
             (or (module-default-component-class parent)
                 (find-class 'cl-source-file)))
        (sysdef-error "~@<don't recognize component type ~A~@:>" type))))

(defun maybe-add-tree (tree op1 op2 c)
  "Add the node C at /OP1/OP2 in TREE, unless it's there already.
Returns the new tree (which probably shares structure with the old one)"
  (let ((first-op-tree (assoc op1 tree)))
    (if first-op-tree
        (progn
          (aif (assoc op2 (cdr first-op-tree))
               (if (find c (cdr it))
                   nil
                   (setf (cdr it) (cons c (cdr it))))
               (setf (cdr first-op-tree)
                     (acons op2 (list c) (cdr first-op-tree))))
          tree)
        (acons op1 (list (list op2 c)) tree))))

(defun union-of-dependencies (&rest deps)
  (let ((new-tree nil))
    (dolist (dep deps)
      (dolist (op-tree dep)
        (dolist (op  (cdr op-tree))
          (dolist (c (cdr op))
            (setf new-tree
                  (maybe-add-tree new-tree (car op-tree) (car op) c))))))

(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 sysdef-error-component (msg type name value)
  (sysdef-error (concatenate 'string msg
                             "~&The value specified for ~(~A~) ~A is ~W")
                type name value))

(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)
    (sysdef-error-component ":depends-on must be a list."
                            type name depends-on))
  (unless (listp weakly-depends-on)
    (sysdef-error-component ":weakly-depends-on must be a list."
                            type name weakly-depends-on))
  (unless (listp components)
    (sysdef-error-component ":components must be NIL or a list of components."
                            type name components))
  (unless (and (listp in-order-to) (listp (car in-order-to)))
    (sysdef-error-component ":in-order-to must be NIL or a list of components."
                            type name in-order-to)))

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(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))
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                (component-inline-methods component)))
  ;; clear methods, then add the new ones
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  (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)
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	      for key = (first data)
	      for value = (second data)
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              while data
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	      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
              ;; the following list of keywords is reproduced below in the
              ;; remove-keys form.  important to keep them in sync
              components pathname default-component-class
              perform explain output-files operation-done-p
              weakly-depends-on
              depends-on serial in-order-to
              ;; list ends
              &allow-other-keys) options
    (declare (ignorable perform explain output-files operation-done-p))
    (check-component-input type name weakly-depends-on depends-on components in-order-to)
               (find-component parent name)
               ;; ignore the same object when rereading the defsystem
               (not
                (typep (find-component parent name)
                       (class-for-type parent type))))
      (error 'duplicate-names :name name))
                        '(components pathname default-component-class
                          perform explain output-files operation-done-p
                          weakly-depends-on
                          depends-on serial in-order-to)
                        rest))
           (ret
            (or (find-component parent name)
                (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)))
      (apply #'reinitialize-instance ret
             :name (coerce-name name)
             :pathname pathname
             :parent parent
             other-args)
        (setf (module-default-component-class ret)
              (or default-component-class
                  (and (typep parent 'module)
                       (module-default-component-class parent))))
        (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)
            (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))))

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      (%refresh-component-inline-methods ret rest)
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;;; 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

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(defun run-shell-command (control-string &rest args)
  "Interpolate `args` into `control-string` as if by `format`, and
synchronously execute the result using a Bourne-compatible shell, with
output to `*verbose-out*`.  Returns the shell's exit code."
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  (let ((command (apply #'format nil control-string args)))
    (asdf-message "; $ ~A~%" command)
    (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))
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    (ext:process-exit-code
     (ext:run-program
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      "/bin/sh"
      (list  "-c" command)
    ;; 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"

    #+clisp                     ;XXX not exactly *verbose-out*, I know
    (ext:run-shell-command  command :output :terminal :wait t)

    #+openmcl
               (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))
  (system-source-file (find-system system-name)))

(defun system-source-directory (system-name)
  (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))))

;;; ---------------------------------------------------------------------------
;;; asdf-binary-locations
;;;
;;; 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))
")
(defparameter *implementation-features*
  '(:allegro :lispworks :sbcl :ccl :openmcl :cmu :clisp
    :corman :cormanlisp :armedbear :gcl :ecl :scl))

(defparameter *os-features*
  '(:windows :mswindows :win32 :mingw32
    :solaris :sunos
    :macosx :darwin :apple
    :freebsd :netbsd :openbsd :bsd
    :linux :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
(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
                      "~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 ""))
                      (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 ~
                                          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)))

;;;; -----------------------------------------------------------------
;;;; Windows shortcut support.  Based on:
;;;;
;;;; Jesse Hager: The Windows Shortcut File Format.
;;;; http://www.wotsit.org/list.asp?fc=13
;;;; -----------------------------------------------------------------
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(defparameter *link-initial-dword* 76)
(defparameter *link-guid* #(1 20 2 0 0 0 0 0 192 0 0 0 0 0 0 70))

(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))))

(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))

(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)))))))
      (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))))))


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(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)
(progn
  (defun module-provide-asdf (name)
    (handler-bind ((style-warning #'muffle-warning))
      (let* ((*verbose-out* (make-broadcast-stream))
             (system (asdf:find-system name nil)))
        (when system
          (asdf:operate 'asdf:load-op 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)))))
   '(let ((home (sb-ext:posix-getenv "SBCL_HOME")))
      (when (and home (not (string= home "")))
        (merge-pathnames "site-systems/" (truename home))))
   *central-registry*)
   '(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"))



#+(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)))