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From: "Kevin F. Quinn" <kevquinn@gentoo.org>
Date: Tue, 1 Nov 2011 18:25:08 +0100
Subject: [PATCH] gcc trampolinewarn
Taken from gentoo, original description:
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)'.
Signed-off-by: Robert Schwebel <r.schwebel@pengutronix.de>
---
gcc/builtins.c | 3 +++
gcc/common.opt | 4 ++++
2 files changed, 7 insertions(+)
diff --git a/gcc/builtins.c b/gcc/builtins.c
index 04980cc..fb3c837 100644
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -4535,6 +4535,9 @@ expand_builtin_va_copy (tree exp)
emit_block_move (dstb, srcb, size, BLOCK_OP_NORMAL);
}
+ if (warn_trampolines)
+ warning (OPT_Wtrampolines, "generating trampoline in object (requires executable stack)");
+
return const0_rtx;
}
diff --git a/gcc/common.opt b/gcc/common.opt
index 033fbe0..2946022 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -646,6 +646,10 @@ Wtype-limits
Common Var(warn_type_limits) Init(-1) Warning
Warn if a comparison is always true or always false due to the limited range of the data type
+Wtrampolines
+Common Var(warn_trampolines) Init(1)
+Warn whenever a trampoline is generated
+
Wuninitialized
Common Var(warn_uninitialized) Init(-1) Warning
Warn about uninitialized automatic variables
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