linux-kernel - Re: [PATCH v2] Makefile: enable -Werror=implicit-int and -Werror=strict-prototypes by default

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Date:	Fri, 23 Aug 2013 20:37:49 +0300
From:	Sergei Trofimovich <slyfox@...too.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Michal Marek <mmarek@...e.cz>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2] Makefile: enable -Werror=implicit-int and
 -Werror=strict-prototypes by default

On Fri, 23 Aug 2013 14:18:02 +0200
Geert Uytterhoeven <geert@...ux-m68k.org> wrote:

> On Thu, Aug 15, 2013 at 8:37 PM, Sergei Trofimovich <slyfox@...too.org> wrote:
> > diff --git a/Makefile b/Makefile
> > index 6e48848..53f4776 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -374,6 +374,11 @@ KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
> >                    -Werror-implicit-function-declaration \
> >                    -Wno-format-security \
> >                    -fno-delete-null-pointer-checks
> > +
> > +# not universally available, but nice to have ones
> > +KBUILD_CFLAGS   +=  $(call cc-option,-Werror=implicit-int) \
> > +                   $(call cc-option,-Werror=strict-prototypes)
> > +
> 
> This should be _below_ the line
> 
>     include $(srctree)/arch/$(SRCARCH)/Makefile
> 
> , together with the other users of cc-option, else it detects the features of
> the host compiler instead of the cross-compiler when cross-compiling:
> 
> cc1: error: unrecognized command line option "-Werror=implicit-int"
> cc1: error: unrecognized command line option "-Werror=strict-prototypes"

Oh, it was not obvious.

Does it mean the code right before is buggy as well?

>    ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
>    KBUILD_CFLAGS<->+= -Os $(call cc-disable-warning,maybe-uninitialized,)
    ^^^
>    else
>    KBUILD_CFLAGS<->+= -O2
>    endif
    
    include $(srctree)/arch/$(SRCARCH)/Makefile

Will respin fixed patch in a while.

Thanks!

-- 

  Sergei

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