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