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

gcc/config.in

 /* config.in.  Generated from configure.ac by autoheader.  */
 
 /* Define as the number of bits in a byte, if `limits.h' doesn't. */
 #ifndef USED_FOR_TARGET
 #undef CHAR_BIT
 #endif
 
 
 /* Define 0/1 to force the choice for exception handling model. */
 #ifndef USED_FOR_TARGET
@@ skipping 83 matching lines @@
 
 
 /* Define if you want operations on GIMPLE (the basic data structure of the
    high-level optimizers) to be checked for dynamic type safety at runtime.
    This is moderately expensive. */
 #ifndef USED_FOR_TARGET
 #undef ENABLE_GIMPLE_CHECKING
 #endif
 
 
+/* Define if gcc should always pass --build-id to linker. */
+#ifndef USED_FOR_TARGET
+#undef ENABLE_LD_BUILDID
+#endif
+
+
 /* Define to 1 if translation of program messages to the user's native
    language is requested. */
 #ifndef USED_FOR_TARGET
 #undef ENABLE_NLS
 #endif
 
 
 /* Define if you want all operations on RTL (the basic data structure of the
    optimizer and back end) to be checked for dynamic type safety at runtime.
    This is quite expensive. */
@@ skipping 899 matching lines @@
 #undef HAVE_LDFCN_H
 #endif
 
 
 /* Define if your linker supports --as-needed and --no-as-needed options. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_LD_AS_NEEDED
 #endif
 
 
+/* Define if your linker supports --build-id. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_LD_BUILDID
+#endif
+
+
 /* Define if your linker supports --demangle option. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_LD_DEMANGLE
 #endif
 
 
 /* Define if your linker supports --eh-frame-hdr option. */
 #undef HAVE_LD_EH_FRAME_HDR
 
 /* Define if your linker supports garbage collection of sections in presence
@@ skipping 560 matching lines @@
 #ifndef USED_FOR_TARGET
 #undef uid_t
 #endif
 
 
 /* Define as `fork' if `vfork' does not work. */
 #ifndef USED_FOR_TARGET
 #undef vfork
 #endif