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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
--- gcc/gcc/common.opt
+++ gcc/gcc/common.opt
@@ -141,6 +141,10 @@
Common Var(warn_system_headers)
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)
Warn about uninitialized automatic variables
--- gcc/gcc/builtins.c
+++ gcc/gcc/builtins.c
@@ -5224,6 +5224,9 @@
#endif
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;
}
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