yann@552: Original patch from gentoo: gentoo/src/patchsets/gcc/4.3.0/gentoo/00_all_gcc-trampolinewarn.patch
yann@552: 	This trivial patch causes gcc to emit a warning whenever
yann@552: 	it generates a trampoline.  These are otherwise hard to
yann@552: 	locate.  It is rigged to default ON - to have it default
yann@552: 	to OFF remove the text 'Init(1)' from the common.opt
yann@552: 	patch, leaving just 'Common Var(warn_trampolines)'.
yann@552: 	Kevin F. Quinn <kevquinn@gentoo.org> 17 Jan 2006
yann@552: 
yann@552: diff -durN gcc-4.3.0.orig/gcc/builtins.c gcc-4.3.0/gcc/builtins.c
yann@552: --- gcc-4.3.0.orig/gcc/builtins.c	2008-02-20 18:27:21.000000000 +0100
yann@552: +++ gcc-4.3.0/gcc/builtins.c	2008-06-10 14:44:10.000000000 +0200
yann@552: @@ -5659,6 +5659,9 @@
yann@552:    trampolines_created = 1;
yann@552:    INITIALIZE_TRAMPOLINE (r_tramp, r_func, r_chain);
yann@552:  
yann@552: +  if (warn_trampolines)
yann@552: +    warning (OPT_Wtrampolines, "generating trampoline in object (requires executable stack)");
yann@552: +
yann@552:    return const0_rtx;
yann@552:  }
yann@552:  
yann@552: diff -durN gcc-4.3.0.orig/gcc/common.opt gcc-4.3.0/gcc/common.opt
yann@552: --- gcc-4.3.0.orig/gcc/common.opt	2008-01-22 15:11:44.000000000 +0100
yann@552: +++ gcc-4.3.0/gcc/common.opt	2008-06-10 14:44:10.000000000 +0200
yann@552: @@ -182,6 +182,10 @@
yann@552:  Common Var(warn_system_headers) Warning
yann@552:  Do not suppress warnings from system headers
yann@552:  
yann@552: +Wtrampolines
yann@552: +Common Var(warn_trampolines) Init(1)
yann@552: +Warn whenever a trampoline is generated
yann@552: +
yann@552:  Wuninitialized
yann@552:  Common Var(warn_uninitialized) Warning
yann@552:  Warn about uninitialized automatic variables