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authorUlrich Drepper <drepper@redhat.com>2009-07-09 23:52:22 -0700
committerUlrich Drepper <drepper@redhat.com>2009-07-09 23:52:22 -0700
commit415ac3df9b10ae426d4f71f9d48003f6a3c7bd8d (patch)
treeffdd1aed425688539db80ff7b9daf6f6ddbcbfff /configure.in
parentDefine STB_GNU_UNIQUE. (diff)
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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.
Diffstat (limited to 'configure.in')
-rw-r--r--configure.in17
1 files changed, 17 insertions, 0 deletions
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