Messages in this thread Patch in this message | | | Date | Wed, 17 Jun 2009 00:16:30 +0400 | From | Anton Vorontsov <> | Subject | [PATCH RFC 1/2] Makefile: Never use -fno-omit-frame-pointer |
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According to Segher Boessenkool and GCC manual, -fomit-frame-pointer is only the default when optimising on archs/ABIs where it doesn't hinder debugging and -pg. So, we do not get it by default on x86, not at any optimisation level.
On the other hand, *using* -fno-omit-frame-pointer causes gcc to produce buggy code on PowerPC targets.
If Segher and GCC manual are right, this patch should be a no-op for all arches except PowerPC, where the patch fixes gcc issues.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> ---
See this thread for more discussion: http://osdir.com/ml/linux-kernel/2009-05/msg01754.html
p.s. Obviously, I didn't test this patch on anything else but PPC32. ;-)
Segher, do you know if all GCC versions that we support for building Linux are behaving the way that GCC manual describe?
Thanks,
Makefile | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/Makefile b/Makefile index ea63667..70ad1ff 100644 --- a/Makefile +++ b/Makefile @@ -535,7 +535,7 @@ KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector) endif ifdef CONFIG_FRAME_POINTER -KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls +KBUILD_CFLAGS += -fno-optimize-sibling-calls else KBUILD_CFLAGS += -fomit-frame-pointer endif -- 1.6.3.1
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