linux-kernel - Re: [PATCH 3/7] [HACK] pass endianess flag to LTO linker

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAK8P3a1Tnq=FgkqWhK7FKMSLyBrRxLhbQVP7o3hwBVa-Yx7A3w@mail.gmail.com>
Date:   Wed, 21 Feb 2018 10:44:27 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Nicolas Pitre <nicolas.pitre@...aro.org>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/7] [HACK] pass endianess flag to LTO linker

On Wed, Feb 21, 2018 at 4:15 AM, Nicolas Pitre <nicolas.pitre@...aro.org> wrote:
> On Tue, 20 Feb 2018, Arnd Bergmann wrote:
>
>> We need some way to pass -mbig-endian to the linker during the
>> LTO link stage, otherwise we get a waning like
>>
>> arm-linux-gnueabi/bin/ld: arch/arm/lib/clearbit.o: compiled for a big endian system and target is little endian
>>
>> for each file we link in.
>>
>> There is probably a better method of passing that flag, I'm just
>> adding it to a different hack that I added earlier for x86 LTO
>> here.
>
> Didn't the patch below fix it for you already?

I think the problem here is that -mbig-endian is part of KBUILD_CPPFLAGS,
not KBUILD_CFLAGS. We add the latter to the gcc-ld command line, but not
the former.

      Arnd