Make filename hashing compatible with self contained builds (bug#43532)

* Makefile.in (lispdirrel): Add replace template.
	(epaths-force): Form correctly 'PATH_REL_LOADSEARCH' into epath.h
	* configure.ac (lispdirrel): Define variable (relative path of the
	lisp files from the installation directory).
	* src/comp.c (Fcomp_el_to_eln_filename): Update algorithm not to
	rely on 'PATH_DUMPLOADSEARCH' but on 'PATH_REL_LOADSEARCH'.
	* src/epaths.in (PATH_REL_LOADSEARCH): Add macro template.

Makefile.in

@@ -223,6 +223,10 @@ iconsrcdir=$(srcdir)/etc/images/icons
 # These variables hold the values Emacs will actually use.  They are
 # based on the values of the standard Make variables above.
 
+# Where lisp files are installed in a distributed with Emacs (relative
+# path to the installation directory).
+lispdirrel=@lispdirrel@
+
 # Where to install the lisp files distributed with Emacs.
 # This includes the Emacs version, so that the lisp files for different
 # versions of Emacs will install themselves in separate directories.
@@ -368,6 +372,7 @@ epaths-force:
 	@(gamedir='${gamedir}'; \
 	  sed < ${srcdir}/src/epaths.in > epaths.h.$$$$		\
 	  -e 's;\(#.*PATH_LOADSEARCH\).*$$;\1 "${standardlisppath}";' \
+	  -e 's;\(#.*PATH_REL_LOADSEARCH\).*$$;\1 "${lispdirrel}";' 	\
 	  -e 's;\(#.*PATH_SITELOADSEARCH\).*$$;\1 "${locallisppath}";' \
 	  -e 's;\(#.*PATH_DUMPLOADSEARCH\).*$$;\1 "${buildlisppath}";' \
 	  -e '/^#define PATH_[^ ]*SEARCH /s/\([":]\):*/\1/g'		\

configure.ac

@@ -187,7 +187,8 @@ dnl It is important that variables on the RHS not be expanded here,
 dnl hence the single quotes.  This is per the GNU coding standards, see
 dnl (autoconf) Installation Directory Variables
 dnl See also epaths.h below.
-lispdir='${datadir}/emacs/${version}/lisp'
+lispdirrel='${version}/lisp'
+lispdir='${datadir}/emacs/'${lispdirrel}
 standardlisppath='${lispdir}'
 locallisppath='${datadir}/emacs/${version}/site-lisp:'\
 '${datadir}/emacs/site-lisp'
@@ -1908,7 +1909,8 @@ if test "${with_ns}" != no; then
      NS_IMPL_COCOA=yes
      ns_appdir=`pwd`/nextstep/Emacs.app
      ns_appbindir=${ns_appdir}/Contents/MacOS
-     ns_appresdir=${ns_appdir}/Contents/Resources
+     lispdirrel=Contents/Resources
+     ns_appresdir=${ns_appdir}/{lispdirrel}
      ns_appsrc=Cocoa/Emacs.base
      ns_fontfile=macfont.o
   elif flags=$( (gnustep-config --objc-flags) 2>/dev/null); then
@@ -5325,6 +5327,7 @@ AC_SUBST(sharedstatedir)
 AC_SUBST(libexecdir)
 AC_SUBST(mandir)
 AC_SUBST(infodir)
+AC_SUBST(lispdirrel)
 AC_SUBST(lispdir)
 AC_SUBST(standardlisppath)
 AC_SUBST(locallisppath)

src/comp.c

@@ -4050,27 +4050,15 @@ If BASE-DIR is nil use the first entry in `comp-eln-load-path'.  */)
      As installing .eln files compiled during the build changes their
      absolute path we need an hashing mechanism that is not sensitive
      to that.  For this we replace if match PATH_DUMPLOADSEARCH or
-     PATH_LOADSEARCH with '//' before generating the hash.  */
+     *PATH_REL_LOADSEARCH with '//' before computing the hash.  */
 
   if (NILP (loadsearch_re_list))
     {
-      Lisp_Object sys_re;
-#ifdef __APPLE__
-      /* On MacOS we relax the match on PATH_LOADSEARCH making
-	 everything before ".app/" a wildcard.  This to obtain a
-	 self-contained Emacs.app (bug#43532).  */
-      char *c;
-      if ((c = strstr (PATH_LOADSEARCH, ".app/")))
-	sys_re =
-	  concat2 (build_string ("\\`[[:ascii:]]+"),
-		   Fregexp_quote (build_string (c)));
-      else
-	sys_re = Fregexp_quote (build_string (PATH_LOADSEARCH));
-#else
-      sys_re = Fregexp_quote (build_string (PATH_LOADSEARCH));
-#endif
+      Lisp_Object sys_re =
+	concat2 (build_string ("\\`[[:ascii:]]+"),
+		 Fregexp_quote (build_string ("/" PATH_REL_LOADSEARCH "/")));
       loadsearch_re_list =
-	list2 (sys_re, Fregexp_quote (build_string (PATH_DUMPLOADSEARCH)));
+	list2 (sys_re, Fregexp_quote (build_string (PATH_DUMPLOADSEARCH "/")));
     }
 
   Lisp_Object lds_re_tail = loadsearch_re_list;

src/epaths.in

@@ -27,6 +27,10 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
 */
 #define PATH_LOADSEARCH "/usr/local/share/emacs/lisp"
 
+/* Like PATH_LOADSEARCH, but contains the relative path from the
+   installation directory.
+*/
+#define PATH_REL_LOADSEARCH ""
 
 /* Like PATH_LOADSEARCH, but contains the non-standard pieces.
    These are the site-lisp directories.  Configure sets this to