X-Git-Url: https://cgit.sxemacs.org/?p=gnus;a=blobdiff_plain;f=lisp%2Fdgnushack.el;h=874207ad619373410fe0eb0279b6ccce249722f8;hp=ab93de1fdbac13f3f6d48c921ed9815dd056922d;hb=fbafd83013a48b244351cdef830b533dfdfa570a;hpb=a5f5dceaf0d901a2c60c8a1114c30fed827376fc

diff --git a/lisp/dgnushack.el b/lisp/dgnushack.el
index ab93de1fd..874207ad6 100644
--- a/lisp/dgnushack.el
+++ b/lisp/dgnushack.el
@@ -1,5 +1,6 @@
 ;;; dgnushack.el --- a hack to set the load path for byte-compiling
-;; Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
+;; Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2003,
+;; 2004, 2005, 2006, 2007, 2008
 ;;        Free Software Foundation, Inc.
 
 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
@@ -10,7 +11,7 @@
 
 ;; GNU Emacs is free software; you can redistribute it and/or modify
 ;; it under the terms of the GNU General Public License as published by
-;; the Free Software Foundation; either version 2, or (at your option)
+;; the Free Software Foundation; either version 3, or (at your option)
 ;; any later version.
 
 ;; GNU Emacs is distributed in the hope that it will be useful,
@@ -20,18 +21,21 @@
 
 ;; You should have received a copy of the GNU General Public License
 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
-;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
 
 ;;; Commentary:
 
 ;;; Code:
 
+(defvar dgnushack-default-load-path (copy-sequence load-path))
+
 (defalias 'facep 'ignore)
 
 (require 'cl)
 
 (defvar srcdir (or (getenv "srcdir") "."))
+(defvar loaddir (and load-file-name (file-name-directory load-file-name)))
 
 (defun my-getenv (str)
   (let ((val (getenv str)))
@@ -40,136 +44,14 @@
 (if (my-getenv "lispdir")
     (push (my-getenv "lispdir") load-path))
 
-(push (or (my-getenv "URLDIR") (expand-file-name "../../url/lisp/" srcdir))
+(push (or (my-getenv "URLDIR") (expand-file-name "../../url/lisp/" loaddir))
       load-path)
 
-(push (or (my-getenv "W3DIR") (expand-file-name "../../w3/lisp/" srcdir))
+(push (or (my-getenv "W3DIR") (expand-file-name "../../w3/lisp/" loaddir))
       load-path)
 
 ;(push "/usr/share/emacs/site-lisp" load-path)
 
-(unless (featurep 'xemacs)
-  (define-compiler-macro last (&whole form x &optional n)
-    (if (and (fboundp 'last)
-	     (subrp (symbol-function 'last)))
-	form
-      (if n
-	  `(let* ((x ,x)
-		  (n ,n)
-		  (m 0)
-		  (p x))
-	     (while (consp p)
-	       (incf m)
-	       (pop p))
-	     (if (<= n 0)
-		 p
-	       (if (< n m)
-		   (nthcdr (- m n) x)
-		 x)))
-	`(let ((x ,x))
-	   (while (consp (cdr x))
-	     (pop x))
-	   x))))
-
-  (define-compiler-macro coerce (&whole form x type)
-    (if (and (fboundp 'coerce)
-	     (subrp (symbol-function 'coerce)))
-	form
-      `(let ((x ,x)
-	     (type ,type))
-	 (cond ((eq type 'list) (if (listp x) x (append x nil)))
-	       ((eq type 'vector) (if (vectorp x) x (vconcat x)))
-	       ((eq type 'string) (if (stringp x) x (concat x)))
-	       ((eq type 'array) (if (arrayp x) x (vconcat x)))
-	       ((and (eq type 'character) (stringp x) (= (length x) 1))
-		(aref x 0))
-	       ((and (eq type 'character) (symbolp x)
-		     (= (length (symbol-name x)) 1))
-		(aref (symbol-name x) 0))
-	       ((eq type 'float) (float x))
-	       ((typep x type) x)
-	       (t (error "Can't coerce %s to type %s" x type))))))
-
-  (define-compiler-macro merge (&whole form type seq1 seq2 pred &rest keys)
-    (if (and (fboundp 'merge)
-	     (subrp (symbol-function 'merge)))
-	form
-      `(let ((type ,type)
-	     (seq1 ,seq1)
-	     (seq2 ,seq2)
-	     (pred ,pred))
-	 (or (listp seq1) (setq seq1 (append seq1 nil)))
-	 (or (listp seq2) (setq seq2 (append seq2 nil)))
-	 (let ((res nil))
-	   (while (and seq1 seq2)
-	     (if (funcall pred (car seq2) (car seq1))
-		 (push (pop seq2) res)
-	       (push (pop seq1) res)))
-	   (coerce (nconc (nreverse res) seq1 seq2) type)))))
-
-  (define-compiler-macro subseq (&whole form seq start &optional end)
-    (if (and (fboundp 'subseq)
-	     (subrp (symbol-function 'subseq)))
-	form
-      (if end
-	  `(let ((seq ,seq)
-		 (start ,start)
-		 (end ,end))
-	     (if (stringp seq)
-		 (substring seq start end)
-	       (let (len)
-		 (if (< end 0)
-		     (setq end (+ end (setq len (length seq)))))
-		 (if (< start 0)
-		     (setq start (+ start (or len (setq len (length seq))))))
-		 (cond ((listp seq)
-			(if (> start 0)
-			    (setq seq (nthcdr start seq)))
-			(let ((res nil))
-			  (while (>= (setq end (1- end)) start)
-			    (push (pop seq) res))
-			  (nreverse res)))
-		       (t
-			(let ((res (make-vector (max (- end start) 0) nil))
-			      (i 0))
-			  (while (< start end)
-			    (aset res i (aref seq start))
-			    (setq i (1+ i)
-				  start (1+ start)))
-			  res))))))
-	`(let ((seq ,seq)
-	       (start ,start))
-	   (if (stringp seq)
-	       (substring seq start)
-	     (let (len)
-	       (if (< start 0)
-		   (setq start (+ start (or len (setq len (length seq))))))
-	       (cond ((listp seq)
-		      (if (> start 0)
-			  (setq seq (nthcdr start seq)))
-		      (copy-sequence seq))
-		     (t
-		      (let* ((end (or len (length seq)))
-			     (res (make-vector (max (- end start) 0) nil))
-			     (i 0))
-			(while (< start end)
-			  (aset res i (aref seq start))
-			  (setq i (1+ i)
-				start (1+ start)))
-			res)))))))))
-
-  (define-compiler-macro copy-list (&whole form list)
-    (if (and (fboundp 'copy-list)
-	     (subrp (symbol-function 'copy-list)))
-	form
-      `(let ((list ,list))
-	 (if (consp list)
-	     (let ((res nil))
-	       (while (consp list) (push (pop list) res))
-	       (prog1 (nreverse res) (setcdr res list)))
-	   (car list)))))
-  )
-
 ;; If we are building w3 in a different directory than the source
 ;; directory, we must read *.el from source directory and write *.elc
 ;; into the building directory.  For that, we define this function
@@ -198,8 +80,109 @@
 ;  (cons 'progn (cdr form)))
 ;(defalias 'byte-compile-file-form-defsubst 'byte-compile-file-form-defun)
 
+(when (and (not (featurep 'xemacs))
+	   (= emacs-major-version 21)
+	   (>= emacs-minor-version 3)
+	   (condition-case code
+	       (let ((byte-compile-error-on-warn t))
+		 (byte-optimize-form (quote (pop x)) t)
+		 nil)
+	     (error (string-match "called for effect"
+				  (error-message-string code)))))
+  (defadvice byte-optimize-form-code-walker (around silence-warn-for-pop
+						    (form for-effect)
+						    activate)
+    "Silence the warning \"...called for effect\" for the `pop' form.
+It is effective only when the `pop' macro is defined by cl.el rather
+than subr.el."
+    (let (tmp)
+      (if (and (eq (car-safe form) 'car)
+	       for-effect
+	       (setq tmp (get 'car 'side-effect-free))
+	       (not byte-compile-delete-errors)
+	       (not (eq tmp 'error-free))
+	       (eq (car-safe (cadr form)) 'prog1)
+	       (let ((var (cadr (cadr form)))
+		     (last (nth 2 (cadr form))))
+		 (and (symbolp var)
+		      (null (nthcdr 3 (cadr form)))
+		      (eq (car-safe last) 'setq)
+		      (eq (cadr last) var)
+		      (eq (car-safe (nth 2 last)) 'cdr)
+		      (eq (cadr (nth 2 last)) var))))
+	  (progn
+	    (put 'car 'side-effect-free 'error-free)
+	    (unwind-protect
+		ad-do-it
+	      (put 'car 'side-effect-free tmp)))
+	ad-do-it))))
+
+(when (and (not (featurep 'xemacs))
+	   (byte-optimize-form
+	    '(and (> 0 1)
+		  (message "This should not appear in the byte-code."))
+	    t))
+  (defadvice byte-optimize-form-code-walker
+    (around fix-bug-in-and/or-forms (form for-effect) activate)
+    "Optimize the rest of the and/or forms.
+It has been fixed in XEmacs before releasing 21.4 and also has been
+fixed in Emacs 22."
+    (if (and for-effect (memq (car-safe form) '(and or)))
+	(let ((fn (car form))
+	      (backwards (reverse (cdr form))))
+	  (while (and backwards
+		      (null (setcar backwards
+				    (byte-optimize-form (car backwards) t))))
+	    (setq backwards (cdr backwards)))
+	  (if (and (cdr form) (null backwards))
+	      (byte-compile-log
+	       "  all subforms of %s called for effect; deleted" form))
+	  (when backwards
+	    (setcdr backwards
+		    (mapcar 'byte-optimize-form (cdr backwards))))
+	  (setq ad-return-value (cons fn (nreverse backwards))))
+      ad-do-it)))
+
+;; Work around for an incompatibility (XEmacs 21.4 vs. 21.5), see the
+;; following threads:
+;;
+;; http://thread.gmane.org/gmane.emacs.gnus.general/56414
+;; Subject: attachment problems found but not fixed
+;;
+;; http://thread.gmane.org/gmane.emacs.gnus.general/56459
+;; Subject: Splitting mail -- XEmacs 21.4 vs 21.5
+;;
+;; http://thread.gmane.org/gmane.emacs.xemacs.beta/20519
+;; Subject: XEmacs 21.5 and Gnus fancy splitting.
+;;
+;; Should be fixed in XEmacs (March 2007).
+;; http://thread.gmane.org/gmane.emacs.xemacs.patches/8124
+;; When should we remove this workaround?
+;;
+(when (and (featurep 'xemacs)
+	   (let ((table (copy-syntax-table emacs-lisp-mode-syntax-table)))
+	     (modify-syntax-entry ?= " " table)
+	     (with-temp-buffer
+	       (with-syntax-table table
+		 (insert "foo=bar")
+		 (goto-char (point-min))
+		 (forward-sexp 1)
+		 (eolp)))))
+  ;; The original `with-syntax-table' uses `copy-syntax-table' which
+  ;; doesn't seem to copy modified syntax entries in XEmacs 21.5.
+  (defmacro with-syntax-table (syntab &rest body)
+    "Evaluate BODY with the SYNTAB as the current syntax table."
+    `(let ((stab (syntax-table)))
+       (unwind-protect
+	   (progn
+	     ;;(set-syntax-table (copy-syntax-table ,syntab))
+	     (set-syntax-table ,syntab)
+	     ,@body)
+	 (set-syntax-table stab)))))
+
 (push srcdir load-path)
-(load (expand-file-name "lpath.el" srcdir) nil t)
+(push loaddir load-path)
+(load (expand-file-name "lpath.el" loaddir) nil t)
 
 (defalias 'device-sound-enabled-p 'ignore)
 (defalias 'play-sound-file 'ignore)
@@ -215,19 +198,117 @@
     (defalias 'x-defined-colors 'ignore)
     (defalias 'read-color 'ignore)))
 
+(eval-and-compile
+  (when (featurep 'xemacs)
+    (unless (fboundp 'defadvice)
+      (autoload 'defadvice "advice" nil nil 'macro))
+    (autoload 'Info-directory "info" nil t)
+    (autoload 'Info-index "info" nil t)
+    (autoload 'Info-index-next "info" nil t)
+    (autoload 'Info-menu "info" nil t)
+    (autoload 'ad-add-advice "advice")
+    (unless (and (emacs-version>= 21 5)
+		 (not (featurep 'sxemacs)))
+      ;; calendar/auto-autoloads.el provides it.
+      (autoload 'add-to-invisibility-spec "dummy"))
+    (autoload 'annotations-at "annotations")
+    (autoload 'apropos "apropos" nil t)
+    (autoload 'apropos-command "apropos" nil t)
+    (autoload 'bbdb-complete-name "bbdb-com" nil t)
+    (autoload 'browse-url "browse-url" nil t)
+    (autoload 'browse-url-of-file "browse-url" nil t)
+    (autoload 'c-mode "cc-mode" nil t)
+    (autoload 'customize-apropos "cus-edit" nil t)
+    (autoload 'customize-group "cus-edit" nil t)
+    (autoload 'customize-save-variable "cus-edit" nil t)
+    (autoload 'customize-set-variable "cus-edit" nil t)
+    (autoload 'customize-variable "cus-edit" nil t)
+    (autoload 'debug "debug" nil t)
+    (if (featurep 'mule)
+	(unless (locate-library "mule-ccl")
+	  (autoload 'define-ccl-program "ccl" nil nil 'macro))
+      (defalias 'define-ccl-program 'ignore))
+    (autoload 'delete-annotation "annotations")
+    (autoload 'dolist "cl-macs" nil nil 'macro)
+    (autoload 'enriched-decode "enriched")
+    (autoload 'eudc-expand-inline "eudc" nil t)
+    (autoload 'executable-find "executable")
+    (autoload 'font-lock-fontify-buffer "font-lock" nil t)
+    (when (and (emacs-version>= 21 5)
+	       (not (featurep 'sxemacs)))
+      (autoload 'get-display-table "disp-table")
+      (autoload 'put-display-table "disp-table"))
+    (autoload 'info "info" nil t)
+    (autoload 'mail-extract-address-components "mail-extr")
+    (autoload 'mail-fetch-field "mail-utils")
+    (autoload 'make-annotation "annotations")
+    (autoload 'make-display-table "disp-table")
+    (autoload 'pgg-snarf-keys-region "pgg" nil t)
+    (autoload 'pp "pp")
+    (autoload 'ps-despool "ps-print" nil t)
+    (autoload 'ps-spool-buffer "ps-print" nil t)
+    (autoload 'ps-spool-buffer-with-faces "ps-print" nil t)
+    (autoload 'read-passwd "passwd")
+    (autoload 'regexp-opt "regexp-opt")
+    (autoload 'reporter-submit-bug-report "reporter")
+    (if (and (emacs-version>= 21 5)
+	     (not (featurep 'sxemacs)))
+	(autoload 'setenv "process" nil t)
+      (autoload 'setenv "env" nil t))
+    (autoload 'sgml-mode "psgml" nil t)
+    (autoload 'smtpmail-send-it "smtpmail")
+    (autoload 'sort-numeric-fields "sort" nil t)
+    (autoload 'sort-subr "sort")
+    (autoload 'thing-at-point "thingatpt")
+    (autoload 'toggle-truncate-lines "view-less" nil t)
+    (autoload 'trace-function-background "trace" nil t)
+    (autoload 'unmorse-region "morse" nil t)
+    (autoload 'w3-do-setup "w3")
+    (autoload 'w3-prepare-buffer "w3-display")
+    (autoload 'w3-region "w3-display" nil t)
+    (defalias 'frame-char-height 'frame-height)
+    (defalias 'frame-char-width 'frame-width)
+    (defalias 'frame-parameter 'frame-property)
+    (defalias 'make-overlay 'ignore)
+    (defalias 'overlay-end 'ignore)
+    (defalias 'overlay-get 'ignore)
+    (defalias 'overlay-put 'ignore)
+    (defalias 'overlay-start 'ignore)
+    (defalias 'overlays-in 'ignore)
+    (defalias 'replace-dehighlight 'ignore)
+    (defalias 'replace-highlight 'ignore)
+    (defalias 'w3-coding-system-for-mime-charset 'ignore)))
+
+(defun dgnushack-emacs-compile-defcustom-p ()
+  "Return non-nil if Emacs byte compiles `defcustom' forms.
+Those Emacsen will warn against undefined variables and functions used
+in `defcustom' forms."
+  (let ((outbuf (with-temp-buffer
+		  (insert "(defcustom foo (1+ (random)) \"\" :group 'emacs)\n")
+		  (byte-compile-from-buffer (current-buffer) "foo.el"))))
+    (when outbuf
+      (prog1
+	  (with-current-buffer outbuf
+	    (goto-char (point-min))
+	    (search-forward " 'foo '(byte-code " nil t))
+	(kill-buffer outbuf)))))
+
+(when (dgnushack-emacs-compile-defcustom-p)
+  (maybe-fbind '(defined-colors face-attribute))
+  (maybe-bind '(idna-program installation-directory)))
+
+(defun dgnushack-compile-verbosely ()
+  "Call dgnushack-compile with warnings ENABLED.  If you are compiling
+patches to gnus, you should consider modifying make.bat to call
+dgnushack-compile-verbosely.  All other users should continue to use
+dgnushack-compile."
+  (dgnushack-compile t))
+
 (defun dgnushack-compile (&optional warn)
   ;;(setq byte-compile-dynamic t)
   (unless warn
     (setq byte-compile-warnings
 	  '(free-vars unresolved callargs redefine)))
-  (unless (locate-library "cus-edit")
-    (error "You do not seem to have Custom installed.
-Fetch it from <URL:http://www.dina.kvl.dk/~abraham/custom/>.
-You also then need to add the following to the lisp/dgnushack.el file:
-
-     (push \"~/lisp/custom\" load-path)
-
-Modify to suit your needs."))
   (let ((files (directory-files srcdir nil "^[^=].*\\.el$"))
 	;;(byte-compile-generate-call-tree t)
 	file elc)
@@ -242,23 +323,23 @@ Modify to suit your needs."))
     (condition-case code
 	(require 'w3-parse)
       (error
-       (message "No w3: %s %s" code (locate-library "w3-parse"))
+       (message "No w3: %s %s" (cadr code) (or (locate-library "w3-parse") ""))
        (dolist (file '("nnultimate.el" "webmail.el" "nnwfm.el"))
 	 (setq files (delete file files)))))
     (condition-case code
 	(require 'mh-e)
       (error
-       (message "No mh-e: %s %s" code (locate-library "mh-e"))
+       (message "No mh-e: %s %s" (cadr code) (or (locate-library "mh-e") ""))
        (setq files (delete "gnus-mh.el" files))))
     (condition-case code
 	(require 'xml)
       (error
-       (message "No xml: %s %s" code (locate-library "xml"))
+       (message "No xml: %s %s" (cadr code) (or (locate-library "xml") ""))
        (setq files (delete "nnrss.el" files))))
     (dolist (file
 	     (if (featurep 'xemacs)
-                '("md5.el")
-	       '("gnus-xmas.el" "messagexmas.el" "nnheaderxm.el" "smiley.el")))
+		 '("md5.el")
+	       '("gnus-xmas.el" "messagexmas.el" "nnheaderxm.el")))
       (setq files (delete file files)))
 
     (dolist (file files)
@@ -280,15 +361,25 @@ Modify to suit your needs."))
   (require 'gnus)
   (byte-recompile-directory "." 0))
 
-(defvar dgnushack-gnus-load-file (expand-file-name "gnus-load.el"))
-(defvar	dgnushack-cus-load-file (expand-file-name "cus-load.el"))
+(defvar dgnushack-gnus-load-file
+  (if (featurep 'xemacs)
+      (expand-file-name "auto-autoloads.el")
+    (expand-file-name "gnus-load.el")))
+
+(defvar	dgnushack-cus-load-file 
+  (if (featurep 'xemacs)
+      (expand-file-name "custom-load.el")
+    (expand-file-name "cus-load.el")))
 
 (defun dgnushack-make-cus-load ()
   (load "cus-dep")
   (let ((cusload-base-file dgnushack-cus-load-file))
     (if (fboundp 'custom-make-dependencies)
 	(custom-make-dependencies)
-      (Custom-make-dependencies))))
+      (Custom-make-dependencies))
+    (when (featurep 'xemacs)
+      (message "Compiling %s..." dgnushack-cus-load-file)
+      (byte-compile-file dgnushack-cus-load-file))))
 
 (defun dgnushack-make-auto-load ()
   (require 'autoload)
@@ -317,43 +408,44 @@ Modify to suit your needs."))
     (batch-update-autoloads)))
 
 (defun dgnushack-make-load ()
-  (message (format "Generating %s..." dgnushack-gnus-load-file))
-  (with-temp-file dgnushack-gnus-load-file
-    (insert-file-contents dgnushack-cus-load-file)
-    (delete-file dgnushack-cus-load-file)
-    (goto-char (point-min))
-    (search-forward ";;; Code:")
-    (forward-line)
-    (delete-region (point-min) (point))
-    (insert "\
+  (unless (featurep 'xemacs)
+    (message "Generating %s..." dgnushack-gnus-load-file)
+    (with-temp-file dgnushack-gnus-load-file
+      (insert-file-contents dgnushack-cus-load-file)
+      (delete-file dgnushack-cus-load-file)
+      (goto-char (point-min))
+      (search-forward ";;; Code:")
+      (forward-line)
+      (delete-region (point-min) (point))
+      (insert "\
 ;;; gnus-load.el --- automatically extracted custom dependencies and autoload
 ;;
 ;;; Code:
 ")
-    (goto-char (point-max))
-    (if (search-backward "custom-versions-load-alist" nil t)
+      (goto-char (point-max))
+      (if (search-backward "custom-versions-load-alist" nil t)
+	  (forward-line -1)
 	(forward-line -1)
-      (forward-line -1)
-      (while (eq (char-after) ?\;)
-	(forward-line -1))
-      (forward-line))
-    (delete-region (point) (point-max))
-    (insert "\n")
-    ;; smiley-* are duplicated. Remove them all.
-    (let ((point (point)))
-      (insert-file-contents dgnushack-gnus-load-file)
-      (goto-char point)
-      (while (search-forward "smiley-" nil t)
-	(beginning-of-line)
-	(if (looking-at "(autoload ")
-	    (delete-region (point) (progn (forward-sexp) (point)))
-	  (forward-line))))
-    ;;
-    (goto-char (point-max))
-    (when (search-backward "\n(provide " nil t)
-      (forward-line -1)
-      (delete-region (point) (point-max)))
-    (insert "\
+	(while (eq (char-after) ?\;)
+	  (forward-line -1))
+	(forward-line))
+      (delete-region (point) (point-max))
+      (insert "\n")
+      ;; smiley-* are duplicated. Remove them all.
+      (let ((point (point)))
+	(insert-file-contents dgnushack-gnus-load-file)
+	(goto-char point)
+	(while (search-forward "smiley-" nil t)
+	  (beginning-of-line)
+	  (if (looking-at "(autoload ")
+	      (delete-region (point) (progn (forward-sexp) (point)))
+	    (forward-line))))
+      ;;
+      (goto-char (point-max))
+      (when (search-backward "\n(provide " nil t)
+	(forward-line -1)
+	(delete-region (point) (point-max)))
+      (insert "\
 
 \(provide 'gnus-load)
 
@@ -364,18 +456,100 @@ Modify to suit your needs."))
 ;;; End:
 ;;; gnus-load.el ends here
 ")
-    ;; Workaround the bug in some version of XEmacs.
-    (when (featurep 'xemacs)
-      (condition-case nil
-	  (require 'cus-load)
-	(error nil))
-      (goto-char (point-min))
-      (when (and (fboundp 'custom-add-loads)
-		 (not (search-forward "\n(autoload 'custom-add-loads " nil t)))
-	(search-forward "\n;;; Code:" nil t)
-	(forward-line 1)
-	(insert "\n(autoload 'custom-add-loads \"cus-load\")\n"))))
-  (message (format "Compiling %s..." dgnushack-gnus-load-file))
-  (byte-compile-file dgnushack-gnus-load-file))
+      ))
+  (message "Compiling %s..." dgnushack-gnus-load-file)
+  (byte-compile-file dgnushack-gnus-load-file)
+  (when (featurep 'xemacs)
+    (message "Creating dummy gnus-load.el...")
+    (with-temp-file (expand-file-name "gnus-load.el")
+      (insert "\
+
+\(provide 'gnus-load)
+
+;;; Local Variables:
+;;; version-control: never
+;;; no-byte-compile: t
+;;; no-update-autoloads: t
+;;; End:
+;;; gnus-load.el ends here"))))
+
+(defun dgnushack-find-lisp-shadows (&optional lispdir)
+  "Return a list of directories in which other Gnus installations exist.
+This function looks for the other Gnus installations which will shadow
+the new Gnus Lisp modules which have been installed in LISPDIR, using
+the default `load-path'.  The return value will make sense only when
+LISPDIR is existent and is listed in the default `load-path'.  Assume
+LISPDIR will be prepended to `load-path' by a user if the default
+`load-path' does not contain it."
+  (unless lispdir
+    (setq lispdir (getenv "lispdir")))
+  (when (and lispdir (file-directory-p lispdir))
+    (setq lispdir (file-truename (directory-file-name lispdir)))
+    (let ((indices '("gnus.elc" "gnus.el" "gnus.el.bz2" "gnus.el.gz"
+		     "message.elc" "message.el" "message.el.bz2"
+		     "message.el.gz"))
+	  (path (delq nil (mapcar
+			   (lambda (p)
+			     (condition-case nil
+				 (when (and p (file-directory-p p))
+				   (file-truename (directory-file-name p)))
+			       (error nil)))
+			   dgnushack-default-load-path)))
+	  rest elcs)
+      (while path
+	(setq rest (cons (car path) rest)
+	      path (delete (car rest) (cdr path))))
+      (setq path (nreverse (cdr (member lispdir rest)))
+	    rest nil)
+      (while path
+	(setq elcs indices)
+	(while elcs
+	  (when (file-exists-p (expand-file-name (pop elcs) (car path)))
+	    (setq rest (cons (car path) rest)
+		  elcs nil)))
+	(setq path (cdr path)))
+      (prog1
+	  (setq path (nreverse rest))
+	(when path
+	  (let (print-level print-length)
+	    (princ (concat "\n\
+WARNING: The other Gnus installation" (if (cdr path) "s have" " has") "\
+ been detected in:\n\n  " (mapconcat 'identity path "\n  ") "\n\n\
+You will need to modify the run-time `load-path', remove them manually,
+or remove them using `make remove-installed-shadows'.\n\n"))))))))
+
+(defun dgnushack-remove-lisp-shadows (&optional lispdir)
+  "Remove the other Gnus installations which shadow the recent one."
+  (let ((path (with-temp-buffer
+		(let ((standard-output (current-buffer)))
+		  (dgnushack-find-lisp-shadows lispdir))))
+	elcs files shadows file)
+    (when path
+      (unless (setq elcs (directory-files srcdir nil "\\.elc\\'"))
+	(error "You should build .elc files first."))
+      (setq files
+	    (apply
+	     'append
+	     (mapcar
+	      (lambda (el)
+		(list (concat el "c") el (concat el ".bz2") (concat el ".gz")))
+	      (append
+	       (list (file-name-nondirectory dgnushack-gnus-load-file)
+		     (file-name-nondirectory dgnushack-cus-load-file))
+	       (mapcar (lambda (elc) (substring elc 0 -1)) elcs)))))
+      (while path
+	(setq shadows files)
+	(while shadows
+	  (setq file (expand-file-name (pop shadows) (car path)))
+	  (when (file-exists-p file)
+	    (princ (concat "  Removing " file "..."))
+	    (condition-case nil
+		(progn
+		  (delete-file file)
+		  (princ "done\n"))
+	      (error (princ "failed\n")))))
+	(setq path (cdr path))))))
 
 ;;; dgnushack.el ends here
+
+;;; arch-tag: 579f585a-24eb-4e1c-8d34-4808e11b68f2