From 415ac3df9b10ae426d4f71f9d48003f6a3c7bd8d Mon Sep 17 00:00:00 2001
From: Ulrich Drepper <drepper@redhat.com>
Date: Thu, 9 Jul 2009 23:52:22 -0700
Subject: Implement STB_GNU_UNIQUE handling.

Some symbols have to be identified process-wide by their name.  This is
particularly important for some C++ features (e.g., class local static data
and static variables in inline functions).  This cannot completely be
implemented with ELF functionality so far.  The STB_GNU_UNIQUE binding
helps by ensuring the dynamic linker will always use the same definition for
all symbols with the same name and this binding.
---
 configure.in | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'configure.in')

diff --git a/configure.in b/configure.in
index 216cdc9d07..61c87418e6 100644
--- a/configure.in
+++ b/configure.in
@@ -1211,6 +1211,23 @@ if test "x$libc_cv_asm_type_prefix" != xno; then
   AC_DEFINE_UNQUOTED(ASM_TYPE_DIRECTIVE_PREFIX, ${libc_cv_asm_type_prefix})
 fi
 
+AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
+	       libc_cv_asm_unique_object, [dnl
+cat > conftest.s <<EOF
+${libc_cv_dot_text}
+_sym:
+.type _sym, ${libc_cv_asm_type_prefix}gnu_unique_object
+EOF
+if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
+  libc_cv_asm_unique_object=yes
+else
+  libc_cv_asm_unique_object=no
+fi
+rm -f conftest*])
+if test $libc_cv_asm_unique_object = yes; then
+  AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
+fi
+
 # For the multi-arch option we need support in the assembler.
 if test "$multi_arch" = yes; then
   if test "x$libc_cv_asm_type_prefix" != xno; then
-- 
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