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[PATCH] _Unwind_DebugHook fix


GCC 4.5/4.6 currently passes no arguments to _Unwind_DebugHook, as they
aren't referenced in the function.  Even before IPA opts removed the
arguments GCC would e.g. make it silently a regparm calling convention on

The following patch makes sure the arguments are passed and are passed using
the standard calling convention.

2010-04-27  Jakub Jelinek  <>

	* unwind-dw2.c (_Unwind_DebugHook): Add used and noclone attributes.

--- gcc/unwind-dw2.c.jj	2010-04-27 08:47:18.000000000 +0200
+++ gcc/unwind-dw2.c	2010-04-27 09:10:34.000000000 +0200
@@ -1482,7 +1482,8 @@ uw_init_context_1 (struct _Unwind_Contex
   context->ra = __builtin_extract_return_addr (outer_ra);
-static void _Unwind_DebugHook (void *, void *) __attribute__ ((__noinline__));
+static void _Unwind_DebugHook (void *, void *)
+  __attribute__ ((__noinline__, __used__, __noclone__));
 /* This function is called during unwinding.  It is intended as a hook
    for a debugger to intercept exceptions.  CFA is the CFA of the


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