linux-kernel - Re: [PATCH] jump label: pass kbuild_cflags when checking for asm goto support

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Date:   Mon, 2 Jan 2017 13:51:11 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     David Lin <dtwlin@...gle.com>
Cc:     mmarek@...e.com, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, jbaron@...mai.com,
        will.deacon@....com
Subject: Re: [PATCH] jump label: pass kbuild_cflags when checking for asm
 goto support

On Sun, 1 Jan 2017 15:05:45 -0800
David Lin <dtwlin@...gle.com> wrote:

> +Cc: Steven Rostedt <rostedt@...dmis.org>
> +Cc: Will Deacon <will.deacon@....com>
> 
> On Fri, Dec 9, 2016 at 4:46 PM, David Lin <dtwlin@...gle.com> wrote:
> > Some versions of ARM GCC compiler such as Android toolchain throws
> > in a '-fpic' flag by default. This causes the gcc-goto check script
> > to fail although some config would have '-fno-pic' flag in the
> > KBUILD_CFLAGS.
> >
> > This patch passes the KBUILD_CFLAGS to the check script so that the
> > script does not rely on the default config from different compilers.
> >
> > Signed-off-by: David Lin <dtwlin@...gle.com>

Acked-by: Steven Rostedt <rostedt@...dmis.org.

-- Steve

> > ---
> >  Makefile | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/Makefile b/Makefile
> > index 694111b..f667daa 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -790,7 +790,7 @@ KBUILD_CFLAGS   += $(call
> > cc-option,-Werror=incompatible-pointer-types) KBUILD_ARFLAGS :=
> > $(call ar-option,D)
> >
> >  # check for 'asm goto'
> > -ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh
> > $(CC)), y) +ifeq ($(shell $(CONFIG_SHELL)
> > $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
> > KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO KBUILD_AFLAGS +=
> > -DCC_HAVE_ASM_GOTO endif
> > --
> > 2.10.2
> >