linux-kernel - Re: [PATCH 1/3] kbuild: add -fno-PIE

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Date:   Tue, 8 Nov 2016 23:14:37 +0100
From:   Michal Marek <mmarek@...e.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        x86@...nel.org, Al Viro <viro@...IV.linux.org.uk>,
        Ben Hutchings <ben@...adent.org.uk>,
        Sven Joachim <svenjoac@....de>,
        "Austin S. Hemmelgarn" <ahferroin7@...il.com>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 1/3] kbuild: add -fno-PIE

On Fri, Nov 04, 2016 at 07:39:38PM +0100, Sebastian Andrzej Siewior wrote:
> Debian started to build the gcc with -fPIE by default so the kernel
> build ends before it starts properly with:
> |kernel/bounds.c:1:0: error: code model kernel does not support PIC mode
> 
> Also add to KBUILD_AFLAGS due to:
> 
> |gcc -Wp,-MD,arch/x86/entry/vdso/vdso32/.note.o.d … -mfentry -DCC_USING_FENTRY … vdso/vdso32/note.S
> |arch/x86/entry/vdso/vdso32/note.S:1:0: sorry, unimplemented: -mfentry isn’t supported for 32-bit in combination with -fpic
> 
> Tagging it stable so it is possible to compile recent stable kernels as
> well.
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> ---
>  Makefile | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Makefile b/Makefile
> index a2650f9c6a25..d61145ebf498 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -622,6 +622,8 @@ include arch/$(SRCARCH)/Makefile
>  KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
>  KBUILD_CFLAGS	+= $(call cc-disable-warning,maybe-uninitialized,)
>  KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
> +KBUILD_CFLAGS	+= $(call cc-option,-fno-PIE)
> +KBUILD_AFLAGS	+= $(call cc-option,-fno-PIE)

Bad compiler. No pie for you.

I applied this one to kbuild.git. How about 2/3 and 3/3. Will these be
merged via tip.git or shall I apply them as well?

Thanks,
Michal