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

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Date:   Sat, 29 Oct 2016 12:10:08 +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

Hi Sven,

On Mon, Oct 24, 2016 at 07:32:30PM +0200, Sven Joachim wrote:
> The attached patch works for me with Debian's gcc-6 package.

I tried your patch when building 4.8.5 on an up-to-date Debian testing and
still got this:

  AS      arch/x86/entry/vdso/vdso32/note.o
arch/x86/entry/vdso/vdso32/note.S:1:0: sorry, unimplemented: -mfentry isn’t supported for 32-bit in combination with -fpic

Adding KBUILD_AFLAGS += $(call cc-option,-fno-pie,) helps.
(Maybe that should be as-option instead. Don't know. There are lots of
AFLAGS=$(call cc-option, ...) in the Makefiles, anyway.)

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