linux-kernel - Re: [PATCH 1/3] Makefile: Include arch Makefiles as late as possible

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Date:	Sat, 14 Feb 2009 20:57:02 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Anton Vorontsov <avorontsov@...mvista.com>,
	Steven Rostedt <srostedt@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	linux-rt-users@...r.kernel.org
Subject: Re: [PATCH 1/3] Makefile: Include arch Makefiles as late as possible

On Wed, Feb 04, 2009 at 10:26:12PM +0100, Ingo Molnar wrote:
> 
> * Anton Vorontsov <avorontsov@...mvista.com> wrote:
> 
> > This patch gives arches more freedom on overwriting CFLAGS, specifically
> > on PowerPC we want to remove -fno-omit-frame-pointer flag.
> > 
> > Signed-off-by: Anton Vorontsov <avorontsov@...mvista.com>
> > ---
> >  Makefile |    4 ++--
> >  1 files changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/Makefile b/Makefile
> > index 7715b2c..d1ba93f 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -525,8 +525,6 @@ else
> >  KBUILD_CFLAGS	+= -O2
> >  endif
> >  
> > -include $(srctree)/arch/$(SRCARCH)/Makefile
> > -
> >  ifneq (CONFIG_FRAME_WARN,0)
> >  KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
> >  endif
> > @@ -555,6 +553,8 @@ ifdef CONFIG_DEBUG_SECTION_MISMATCH
> >  KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
> >  endif
> >  
> > +include $(srctree)/arch/$(SRCARCH)/Makefile
> > +
> >  # arch Makefile may override CC so keep this after arch Makefile is included
> >  NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
> >  CHECKFLAGS     += $(NOSTDINC_FLAGS)
> > -- 
> 
> this patch is really for Sam to judge - Cc:-ed him.

If we move the include further down then the following:

    # Force gcc to behave correct even for buggy distributions
    # Arch Makefiles may override this setting
    KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)

will most likely fail.

If popwerpc needs to get rid of "-fno-omit-frame-pointer" then
we need a way to express this at KConfig level and NOT by doing
some tricks with CFLAGS.

	Sam
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