linux-kernel - Re: [linux-next:master 1341/1811] cc1: error: unrecognized command line option "-mstack-alignment=8"

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Date:   Thu, 20 Jul 2017 10:29:33 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     kbuild test robot <fengguang.wu@...el.com>
Cc:     Matthias Kaehlcke <mka@...omium.org>, kbuild-all@...org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [linux-next:master 1341/1811] cc1: error: unrecognized command
 line option "-mstack-alignment=8"


* kbuild test robot <fengguang.wu@...el.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   c981f0b3fb08ee58aacb208fe7f45628af420bba
> commit: 79e6b917e69a34d45e83e72f1e9bb7487d5f5832 [1341/1811] x86/build: Fix stack alignment for CLang
> config: x86_64-randconfig-a0-07200731 (attached as .config)
> compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
> reproduce:
>         git checkout 79e6b917e69a34d45e83e72f1e9bb7487d5f5832
>         # save the attached .config to linux build tree
>         make ARCH=x86_64 
> 
> All errors (new ones prefixed by >>):
> 
>    arch/x86/Makefile:172: Disabling CONFIG_CC_OPTIMIZE_FOR_SIZE.  Your compiler does not have -mfentry so you cannot optimize for size with CONFIG_FUNCTION_GRAPH_TRACER.
> >> cc1: error: unrecognized command line option "-mstack-alignment=8"
>    make[2]: *** [kernel/bounds.s] Error 1
>    make[2]: Target '__build' not remade because of errors.
>    make[1]: *** [prepare0] Error 2
>    make[1]: Target 'prepare' not remade because of errors.
>    make: *** [sub-make] Error 2

Ok, I've removed this commit from x86/urgent for now, pending the resolution of 
this build bug.

Thanks,

	Ingo