Darwin, rpaths: Add --with-darwin-extra-rpath.

This is provided to allow distributions to add a single additional
runpath to allow for cases where the installed GCC library directories
are then symlinked to a common dirctory outside of any of the GCC
installations.

For example:

/opt/distro/lib:
  libgfortran.dylib -> /opt/distro/lib/gcc-11.3/lib/libgfortran.dylib

So that libraries which are designed to be found in the runpath we would then
add --with-darwin-add-rpath=/opt/distro/lib to the configure line.

This patch makes the configuration a little more forgiving of using
--disable-darwin-at-rpath (although for platform versions >= 10.11 this will
result in misconfigured target libraries).

gcc/ChangeLog:

	* configure.ac: Add --with-darwin-extra-rpath option.
	* config/darwin.h: Handle DARWIN_EXTRA_RPATH.
	* config.in: Regenerate.
	* configure: Regenerate.

Author: iains

gcc/config.in

@@ -49,6 +49,19 @@
 #endif
 
 
+/* Specify a runpath directory, additional to those provided by the compiler
+   */
+#ifndef USED_FOR_TARGET
+#undef DARWIN_ADD_RPATH
+#endif
+
+
+/* Should add an extra runpath directory */
+#ifndef USED_FOR_TARGET
+#undef DARWIN_DO_EXTRA_RPATH
+#endif
+
+
 /* Define to enable the use of a default assembler. */
 #ifndef USED_FOR_TARGET
 #undef DEFAULT_ASSEMBLER

gcc/config/darwin.h

@@ -321,6 +321,19 @@ extern GTY(()) int darwin_ms_struct;
  %:version-compare(>= 10.11 mmacosx-version-min= -lemutls_w) "
 #endif
 
+/* We might elect to add a path even when this compiler does not use embedded
+   run paths, so that we can use libraries from an alternate compiler that is
+   using embedded runpaths.  */
+#if DARWIN_DO_EXTRA_RPATH
+# define DARWIN_EXTRA_RPATH \
+"%{!r:%{!nostdlib:%{!nodefaultrpaths:\
+    %:version-compare(>= 10.5 mmacosx-version-min= -rpath) \
+    %:version-compare(>= 10.5 mmacosx-version-min= " DARWIN_ADD_RPATH ") \
+  }}}"
+#else
+# define DARWIN_EXTRA_RPATH ""
+#endif
+
 #define SUBSUBTARGET_OVERRIDE_OPTIONS					\
   do {									\
     darwin_override_options ();						\
@@ -415,6 +428,7 @@ extern GTY(()) int darwin_ms_struct;
     DARWIN_NOPIE_SPEC \
     DARWIN_RDYNAMIC \
     DARWIN_NOCOMPACT_UNWIND \
+    DARWIN_EXTRA_RPATH \
     DARWIN_RPATH_LINK \
     "}}}}}}} %<pie %<no-pie %<rdynamic %<X %<rpath %<nodefaultrpaths "
 

gcc/configure

@@ -1012,6 +1012,7 @@ with_pic
 enable_fast_install
 enable_libtool_lock
 enable_darwin_at_rpath
+with_darwin_extra_rpath
 enable_ld
 enable_gold
 with_plugin_ld
@@ -1873,6 +1874,9 @@ Optional Packages:
   --with-pic              try to use only PIC/non-PIC objects [default=use
                           both]
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
+  --with-darwin-extra-rpath=[ARG]
+                          Specify a runpath directory, additional to those
+                          provided by the compiler
   --with-plugin-ld=[ARG]  specify the plugin linker
   --with-glibc-version=M.N
                           assume GCC used with glibc version M.N or later
@@ -19976,7 +19980,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 19979 "configure"
+#line 19983 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -20082,7 +20086,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 20085 "configure"
+#line 20089 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -23410,6 +23414,26 @@ else
   ENABLE_DARWIN_AT_RPATH_FALSE=
 fi
 
+DARWIN_DO_EXTRA_RPATH=0
+
+# Check whether --with-darwin-extra-rpath was given.
+if test "${with_darwin_extra_rpath+set}" = set; then :
+  withval=$with_darwin_extra_rpath; if test x"$withval" != x; then
+   DARWIN_ADD_RPATH="$withval"
+   DARWIN_DO_EXTRA_RPATH=1
+ fi
+fi
+
+
+cat >>confdefs.h <<_ACEOF
+#define DARWIN_DO_EXTRA_RPATH $DARWIN_DO_EXTRA_RPATH
+_ACEOF
+
+
+cat >>confdefs.h <<_ACEOF
+#define DARWIN_ADD_RPATH "$DARWIN_ADD_RPATH"
+_ACEOF
+
 
 # Identify the assembler which will work hand-in-glove with the newly
 # built GCC, so that we can examine its features.  This is the assembler

gcc/configure.ac

@@ -2633,6 +2633,19 @@ AC_SUBST(objdir)
 AC_SUBST(enable_fast_install)
 
 AM_CONDITIONAL([ENABLE_DARWIN_AT_RPATH], [test x$enable_darwin_at_rpath = xyes])
+DARWIN_DO_EXTRA_RPATH=0
+AC_ARG_WITH(darwin-extra-rpath,
+[AS_HELP_STRING(
+  [[--with-darwin-extra-rpath=[ARG]]],
+   [Specify a runpath directory, additional to those provided by the compiler])],
+[if test x"$withval" != x; then
+   DARWIN_ADD_RPATH="$withval"
+   DARWIN_DO_EXTRA_RPATH=1
+ fi])
+AC_DEFINE_UNQUOTED(DARWIN_DO_EXTRA_RPATH, $DARWIN_DO_EXTRA_RPATH,
+  [Should add an extra runpath directory])
+AC_DEFINE_UNQUOTED(DARWIN_ADD_RPATH, "$DARWIN_ADD_RPATH",
+  [Specify a runpath directory, additional to those provided by the compiler])
 
 # Identify the assembler which will work hand-in-glove with the newly
 # built GCC, so that we can examine its features.  This is the assembler