Original patch from gentoo: gentoo/src/patchsets/gcc/4.3.1/gentoo/00_all_gcc-trampolinewarn.patch

	This trivial patch causes gcc to emit a warning whenever

	it generates a trampoline.  These are otherwise hard to

	locate.  It is rigged to default ON - to have it default

	to OFF remove the text 'Init(1)' from the common.opt

	patch, leaving just 'Common Var(warn_trampolines)'.

	Kevin F. Quinn <kevquinn@gentoo.org> 17 Jan 2006

diff -durN gcc-4.3.1.orig/gcc/builtins.c gcc-4.3.1/gcc/builtins.c

--- gcc-4.3.1.orig/gcc/builtins.c	2008-04-23 00:36:27.000000000 +0200

+++ gcc-4.3.1/gcc/builtins.c	2008-06-10 14:56:54.000000000 +0200

@@ -5662,6 +5662,9 @@

   trampolines_created = 1;

   INITIALIZE_TRAMPOLINE (r_tramp, r_func, r_chain);

+  if (warn_trampolines)

+    warning (OPT_Wtrampolines, "generating trampoline in object (requires executable stack)");

+

   return const0_rtx;

 }

diff -durN gcc-4.3.1.orig/gcc/common.opt gcc-4.3.1/gcc/common.opt

--- gcc-4.3.1.orig/gcc/common.opt	2008-01-22 15:11:44.000000000 +0100

+++ gcc-4.3.1/gcc/common.opt	2008-06-10 14:56:54.000000000 +0200

@@ -182,6 +182,10 @@

 Common Var(warn_system_headers) Warning

 Do not suppress warnings from system headers

+Wtrampolines

+Common Var(warn_trampolines) Init(1)

+Warn whenever a trampoline is generated

+

 Wuninitialized

 Common Var(warn_uninitialized) Warning

 Warn about uninitialized automatic variables