1 files changed, 14 insertions, 0 deletions

diff --git a/contrib/libstdc++/acconfig.h b/contrib/libstdc++/acconfig.h
index aa0dd99cfa9e..777e94a5039a 100644
--- a/contrib/libstdc++/acconfig.h
+++ b/contrib/libstdc++/acconfig.h
@@ -46,6 +46,20 @@
 // Define if you have the copysignf function.
 #undef _GLIBCPP_HAVE_COPYSIGNF
 
+// Define to use symbol versioning in the shared library.
+#undef _GLIBCPP_SYMVER
+
+// Define symbol versioning in assember directives. If symbol
+// versioning is beigng used, and the assembler supports this kind of
+// thing, then use it.
+// NB: _GLIBCPP_AT_AT is a hack to work around quoting issues in m4.
+#if _GLIBCPP_SYMVER
+  #define _GLIBCPP_ASM_SYMVER(cur, old, version) \
+   asm (".symver " #cur "," #old _GLIBCPP_AT_AT #version);
+#else
+  #define _GLIBCPP_ASM_SYMVER(cur, old, version)
+#endif
+
 // Define if mbstate_t exists in wchar.h.
 #undef HAVE_MBSTATE_T