Index: calls.c
===================================================================
--- calls.c	(revision 234098)
+++ calls.c	(working copy)
@@ -3852,7 +3852,7 @@ emit_library_call_value_1 (int retval, r
   reg_parm_stack_space = REG_PARM_STACK_SPACE ((tree) 0);
 #endif
 
-  /* By default, library functions can not throw.  */
+  /* By default, library functions cannot throw.  */
   flags = ECF_NOTHROW;
 
   switch (fn_type)
@@ -3869,7 +3869,7 @@ emit_library_call_value_1 (int retval, r
       flags |= ECF_NORETURN;
       break;
     case LCT_THROW:
-      flags = ECF_NORETURN;
+      flags &= ~ECF_NOTHROW;
       break;
     case LCT_RETURNS_TWICE:
       flags = ECF_RETURNS_TWICE;
Index: explow.c
===================================================================
--- explow.c	(revision 234098)
+++ explow.c	(working copy)
@@ -1566,7 +1566,7 @@ probe_stack_range (HOST_WIDE_INT first,
 					         stack_pointer_rtx,
 					         plus_constant (Pmode,
 								size, first)));
-      emit_library_call (stack_check_libfunc, LCT_NORMAL, VOIDmode, 1, addr,
+      emit_library_call (stack_check_libfunc, LCT_THROW, VOIDmode, 1, addr,
 			 Pmode);
     }