--- a/src/gcc/config/i386/gnu.h.orig	2014-01-05 20:58:22.000000000 +0100
+++ b/src/gcc/config/i386/gnu.h	2014-04-07 11:21:00.000000000 +0200
@@ -36,12 +36,14 @@
 #endif
 
 #ifdef TARGET_LIBC_PROVIDES_SSP
+/* i386 glibc provides __stack_chk_guard in %gs:0x14.  */
+#define TARGET_THREAD_SSP_OFFSET	0x14
 
-/* Not supported yet.  */
-# undef TARGET_THREAD_SSP_OFFSET
-
-/* Not supported yet.  */
-# undef TARGET_CAN_SPLIT_STACK
-# undef TARGET_THREAD_SPLIT_STACK_OFFSET
-
+/* We only build the -fsplit-stack support in libgcc if the
+   assembler has full support for the CFI directives.  */
+#if HAVE_GAS_CFI_PERSONALITY_DIRECTIVE
+#define TARGET_CAN_SPLIT_STACK
+#endif
+/* We steal the last transactional memory word.  */
+#define TARGET_THREAD_SPLIT_STACK_OFFSET 0x30
 #endif