Original patch from gentoo: gentoo/src/patchsets/gcc/4.3.0/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-4.3.0.orig/gcc/builtins.c gcc-4.3.0/gcc/builtins.c

 --- gcc-4.3.0.orig/gcc/builtins.c	2008-02-20 18:27:21.000000000 +0100

 +++ gcc-4.3.0/gcc/builtins.c	2008-06-10 14:44:10.000000000 +0200

 @@ -5659,6 +5659,9 @@

    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-4.3.0.orig/gcc/common.opt gcc-4.3.0/gcc/common.opt

 --- gcc-4.3.0.orig/gcc/common.opt	2008-01-22 15:11:44.000000000 +0100

 +++ gcc-4.3.0/gcc/common.opt	2008-06-10 14:44:10.000000000 +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