[PATCH 03/10] ftrace: allow building without frame pointers
From: Frederic Weisbecker <hidden>
Date: 2010-02-22 18:36:15
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lkml
On Sun, Feb 14, 2010 at 01:18:31AM +0530, Rabin Vincent wrote:
With current gcc, compiling with both -pg and -fomit-frame-pointer is not allowed. However, -pg can be used to build without actually specying -fno-omit-frame-pointer, upon which the defaut behaviour for the target will be used.
Doh!....
On ARM, it is not possible to build a Thumb-2 kernel with -fno-omit-frame-pointer (FRAME_POINTERS depends on !THUMB2_KERNEL). In order to support ftrace for Thumb-2, we need to be able to allow a combination of FUNCTION_TRACER and !FRAME_POINTER. We do this by omitting -fomit-frame-pointer if ftrace is enabled. Signed-off-by: Rabin Vincent <redacted>
I might be missing something subtle on this one, but it looks good to me. Acked-by: Frederic Weisbecker <redacted>
quoted hunk ↗ jump to hunk
--- Makefile | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-)diff --git a/Makefile b/Makefile index 67d6cff..72d90de 100644 --- a/Makefile +++ b/Makefile@@ -546,8 +546,11 @@ endif ifdef CONFIG_FRAME_POINTER KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls else +ifndef CONFIG_FUNCTION_TRACER +# -fomit-frame-pointer is incompatible with -pg KBUILD_CFLAGS += -fomit-frame-pointer endif +endif ifdef CONFIG_DEBUG_INFO KBUILD_CFLAGS += -g-- 1.6.6