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.

1 files changed, 26 insertions, 0 deletions

diff --git a/configure b/configure
index e30778fd94..4e49f7068b 100755
--- a/configure
+++ b/configure
@@ -5994,6 +5994,32 @@ _ACEOF
 
 fi
 
+{ $as_echo "$as_me:$LINENO: checking for assembler gnu_unique_object symbol type" >&5
+$as_echo_n "checking for assembler gnu_unique_object symbol type... " >&6; }
+if test "${libc_cv_asm_unique_object+set}" = set; then
+  $as_echo_n "(cached) " >&6
+else
+  cat > conftest.s <<EOF
+${libc_cv_dot_text}
+_sym:
+.type _sym, ${libc_cv_asm_type_prefix}gnu_unique_object
+EOF
+if ${CC-cc} -c $ASFLAGS conftest.s 1>&5 2>&5; then
+  libc_cv_asm_unique_object=yes
+else
+  libc_cv_asm_unique_object=no
+fi
+rm -f conftest*
+fi
+{ $as_echo "$as_me:$LINENO: result: $libc_cv_asm_unique_object" >&5
+$as_echo "$libc_cv_asm_unique_object" >&6; }
+if test $libc_cv_asm_unique_object = yes; then
+  cat >>confdefs.h <<\_ACEOF
+#define HAVE_ASM_UNIQUE_OBJECT 1
+_ACEOF
+
+fi
+
 # For the multi-arch option we need support in the assembler.
 if test "$multi_arch" = yes; then
   if test "x$libc_cv_asm_type_prefix" != xno; then