Backport GCC 4.5+ --enable-linker-build-id option.

gcc/configure

 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.59.
 #
 # Copyright (C) 2003 Free Software Foundation, Inc.
 # This configure script is free software; the Free Software Foundation
 # gives unlimited permission to copy, distribute and modify it.
 ## --------------------- ##
 ## M4sh Initialization.  ##
 ## --------------------- ##
@@ skipping 1060 matching lines @@
   --enable-win32-registry=KEY
                           use KEY instead of GCC version as the last portion
                           of the registry key
   --enable-shared[=PKGS]
                           build shared libraries [default=yes]
   --enable-static[=PKGS]
                           build static libraries [default=yes]
   --enable-fast-install[=PKGS]
                           optimize for fast installation [default=yes]
   --disable-libtool-lock  avoid locking (might break parallel builds)
+  --enable-linker-build-id
+                          compiler will always pass --build-id to linker
   --enable-maintainer-mode
                           enable make rules and dependencies not useful
                           (and sometimes confusing) to the casual installer
   --enable-version-specific-runtime-libs
                           specify that runtime libraries should be
                           installed in a compiler-specific directory
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
   --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
@@ skipping 23116 matching lines @@
     if test x"$gcc_cv_ld_no_dot_syms" = xyes; then
 
 cat >>confdefs.h <<\_ACEOF
 #define HAVE_LD_NO_DOT_SYMS 1
 _ACEOF
 
     fi
     ;;
 esac
 
+echo "$as_me:$LINENO: checking linker --build-id support" >&5
+echo $ECHO_N "checking linker --build-id support... $ECHO_C" >&6
+if test "${gcc_cv_ld_buildid+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  gcc_cv_ld_buildid=no
+  if test $in_tree_ld = yes ; then
+    if test "$gcc_cv_gld_major_version" -eq 2 -a \
+       "$gcc_cv_gld_minor_version" -ge 18 -o \
+       "$gcc_cv_gld_major_version" -gt 2 \
+       && test $in_tree_ld_is_elf = yes; then
+      gcc_cv_ld_buildid=yes
+    fi
+  elif test x$gcc_cv_ld != x; then
+    if $gcc_cv_ld --help 2>/dev/null | grep build-id > /dev/null; then
+      gcc_cv_ld_buildid=yes
+    fi
+  fi
+fi
+echo "$as_me:$LINENO: result: $gcc_cv_ld_buildid" >&5
+echo "${ECHO_T}$gcc_cv_ld_buildid" >&6
+if test x"$gcc_cv_ld_buildid" = xyes; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_LD_BUILDID 1
+_ACEOF
+
+fi
+
+# Check whether --enable-linker-build-id or --disable-linker-build-id was given.
+if test "${enable_linker_build_id+set}" = set; then
+  enableval="$enable_linker_build_id"
+
+else
+  enable_linker_build_id=no
+fi;
+
+if test x"$enable_linker_build_id" = xyes; then
+  if test x"$gcc_cv_ld_buildid" = xyes; then
+
+cat >>confdefs.h <<\_ACEOF
+#define ENABLE_LD_BUILDID 1
+_ACEOF
+
+  else
+    { echo "$as_me:$LINENO: WARNING: --build-id is not supported by your linker; --enable-linker-build-id ignored" >&5
+echo "$as_me: WARNING: --build-id is not supported by your linker; --enable-linker-build-id ignored" >&2;}
+  fi
+fi
+
 echo "$as_me:$LINENO: checking linker --sysroot support" >&5
 echo $ECHO_N "checking linker --sysroot support... $ECHO_C" >&6
 if test "${gcc_cv_ld_sysroot+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
 else
   gcc_cv_ld_sysroot=no
   if test $in_tree_ld = yes ; then
       if test "$gcc_cv_gld_major_version" -eq 2 -a "$gcc_cv_gld_minor_version" -ge 16 -o "$gcc_cv_gld_major_version" -gt 2 ; then
         gcc_cv_ld_sysroot=yes
       fi
@@ skipping 2075 matching lines @@
   test "$silent" = yes &&
     ac_config_status_args="$ac_config_status_args --quiet"
   exec 5>/dev/null
   $SHELL $CONFIG_STATUS $ac_config_status_args || ac_cs_success=false
   exec 5>>config.log
   # Use ||, not &&, to avoid exiting from the if with $? = 1, which
   # would make configure fail if this is the last instruction.
   $ac_cs_success || { (exit 1); exit 1; }
 fi