linux-kernel - Re: [RFC PATCH] kbuild: add -fno-PIE

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Date:   Sat, 29 Oct 2016 21:21:50 +0200
From:   Tomas Janousek <tomi@...i.cz>
To:     Sven Joachim <svenjoac@....de>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Joe Perches <joe@...ches.com>,
        Adam Borowski <kilobyte@...band.pl>,
        Michal Marek <mmarek@...e.com>, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, ben@...adent.org.uk
Subject: Re: [RFC PATCH] kbuild: add -fno-PIE

On Sat, Oct 29, 2016 at 07:03:30PM +0200, Sven Joachim wrote:
> I cannot reproduce that, FWIW.  Also, arch/x86/entry/vdso/Makefile seems
> to explicitly filter out -mfentry from the compiler flags, but maybe I
> misunderstand something.

Compiler flags, yes; assembler flags, no. Perhaps adding

    KBUILD_AFLAGS_32 := $(filter-out -mfentry,$(KBUILD_AFLAGS_32))

to arch/x86/entry/vdso/Makefile would fix the build as well. I have honestly
no idea which solution is better. :-)

> Could you please show the exact command that's failing with "make V=1"?

gcc -Wp,-MD,arch/x86/entry/vdso/vdso32/.note.o.d  -nostdinc -isystem /usr/lib/gcc/i686-linux-gnu/6/include -I./arch/x86/include -I./arch/x86/include/generated/uapi -I./arch/x86/include/generated  -I./include -I./arch/x86/include/uapi -I./include/uapi -I./include/generated/uapi -include ./include/linux/kconfig.h -D__KERNEL__ -D__ASSEMBLY__ -DCONFIG_X86_X32_ABI -DCONFIG_AS_CFI=1 -DCONFIG_AS_CFI_SIGNAL_FRAME=1 -DCONFIG_AS_CFI_SECTIONS=1 -DCONFIG_AS_FXSAVEQ=1 -DCONFIG_AS_SSSE3=1 -DCONFIG_AS_CRC32=1 -DCONFIG_AS_AVX=1 -DCONFIG_AS_AVX2=1 -DCONFIG_AS_SHA1_NI=1 -DCONFIG_AS_SHA256_NI=1 -Wa,-gdwarf-2 -mfentry -DCC_USING_FENTRY -DCC_HAVE_ASM_GOTO -DBUILD_VDSO -m32   -c -o arch/x86/entry/vdso/vdso32/note.o arch/x86/entry/vdso/vdso32/note.S

Is this file being built with your .config?

-- 
Tomáš Janoušek, a.k.a. Pivník, a.k.a. Liskni_si, http://work.lisk.in/