commit cba5e8c2535f5950d1c78a6c35a2f83d549f37dc
Author: Jason Merrill <jason@redhat.com>
Date:   Sat Jan 19 12:08:25 2013 -0500

    	* configure.ac: Check for __cxa_thread_atexit_impl.
    	* libsupc++/atexit_thread.cc (__cxa_thread_atexit): Just forward
    	to it if available.
    	* config.h.in, configure: Regenerate.

diff --git a/libstdc++-v3/config.h.in b/libstdc++-v3/config.h.in
index dd14b91..c14862d 100644
--- a/libstdc++-v3/config.h.in
+++ b/libstdc++-v3/config.h.in
@@ -652,6 +652,9 @@
 /* Define to 1 if you have the `_tanl' function. */
 #undef HAVE__TANL
 
+/* Define to 1 if you have the `__cxa_thread_atexit_impl' function. */
+#undef HAVE___CXA_THREAD_ATEXIT_IMPL
+
 /* Define as const if the declaration of iconv() needs const. */
 #undef ICONV_CONST
 
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index a4cf5c9..f53b9cf 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -26584,6 +26584,18 @@ $as_echo "#define HAVE_TLS 1" >>confdefs.h
 
   fi
 
+  for ac_func in __cxa_thread_atexit_impl
+do :
+  ac_fn_c_check_func "$LINENO" "__cxa_thread_atexit_impl" "ac_cv_func___cxa_thread_atexit_impl"
+if test "x$ac_cv_func___cxa_thread_atexit_impl" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE___CXA_THREAD_ATEXIT_IMPL 1
+_ACEOF
+
+fi
+done
+
+
   # For iconv support.
 
       if test "X$prefix" = "XNONE"; then
diff --git a/libstdc++-v3/configure.ac b/libstdc++-v3/configure.ac
index 66164a2..a64fee2 100644
--- a/libstdc++-v3/configure.ac
+++ b/libstdc++-v3/configure.ac
@@ -235,6 +235,8 @@ if $GLIBCXX_IS_NATIVE; then
   # For TLS support.
   GCC_CHECK_TLS
 
+  AC_CHECK_FUNCS(__cxa_thread_atexit_impl)
+
   # For iconv support.
   AM_ICONV
 
diff --git a/libstdc++-v3/libsupc++/atexit_thread.cc b/libstdc++-v3/libsupc++/atexit_thread.cc
index 95bdcf0..ce26717 100644
--- a/libstdc++-v3/libsupc++/atexit_thread.cc
+++ b/libstdc++-v3/libsupc++/atexit_thread.cc
@@ -26,6 +26,20 @@
 #include <new>
 #include "bits/gthr.h"
 
+#if HAVE___CXA_THREAD_ATEXIT_IMPL
+
+extern "C" int __cxa_thread_atexit_impl (void (*func) (void *),
+					 void *arg, void *d);
+extern "C" int
+__cxxabiv1::__cxa_thread_atexit (void (*dtor)(void *),
+				 void *obj, void *dso_handle)
+  _GLIBCXX_NOTHROW
+{
+  return __cxa_thread_atexit_impl (dtor, obj, dso_handle);
+}
+
+#else /* HAVE___CXA_THREAD_ATEXIT_IMPL */
+
 namespace {
   // One element in a singly-linked stack of cleanups.
   struct elt
@@ -116,3 +130,5 @@ __cxxabiv1::__cxa_thread_atexit (void (*dtor)(void *), void *obj, void */*dso_ha
 
   return 0;
 }
+
+#endif /* HAVE___CXA_THREAD_ATEXIT_IMPL */