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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/builtins.c | 3 +++
gcc/common.opt | 4 ++++
2 files changed, 7 insertions(+)
Index: gcc-4.3.1/gcc/common.opt
===================================================================
--- gcc-4.3.1.orig/gcc/common.opt
+++ gcc-4.3.1/gcc/common.opt
@@ -182,6 +182,10 @@ Wsystem-headers
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
Index: gcc-4.3.1/gcc/builtins.c
===================================================================
--- gcc-4.3.1.orig/gcc/builtins.c
+++ gcc-4.3.1/gcc/builtins.c
@@ -5662,6 +5662,9 @@ expand_builtin_init_trampoline (tree exp
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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