linux-kernel - Re: gcc-5: error: -gz is not supported in this configuration

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Message-ID: <20200609174954.cckelwl6etwztmhv@google.com>
Date:   Tue, 9 Jun 2020 10:49:54 -0700
From:   Fangrui Song <maskray@...gle.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     kernel test robot <lkp@...el.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        kbuild-all@...ts.01.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: gcc-5: error: -gz is not supported in this configuration

On 2020-06-09, Nick Desaulniers wrote:
>On Tue, Jun 9, 2020 at 6:12 AM kernel test robot <lkp@...el.com> wrote:
>>
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   abfbb29297c27e3f101f348dc9e467b0fe70f919
>> commit: 10e68b02c861ccf2b3adb59d3f0c10dc6b5e3ace Makefile: support compressed debug info
>> date:   12 days ago
>> config: x86_64-randconfig-r032-20200609 (attached as .config)
>> compiler: gcc-5 (Ubuntu 5.5.0-12ubuntu1) 5.5.0 20171010
>> reproduce (this is a W=1 build):
>>         git checkout 10e68b02c861ccf2b3adb59d3f0c10dc6b5e3ace
>>         # save the attached .config to linux build tree
>>         make W=1 ARCH=x86_64
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kernel test robot <lkp@...el.com>
>>
>> All errors (new ones prefixed by >>, old ones prefixed by <<):
>>
>> >> gcc-5: error: -gz is not supported in this configuration
>
>Hmm...I wonder if the feature detection is incomplete?  I suspect it's
>possible to not depend on zlib.
>
>> make[2]: *** [scripts/Makefile.build:277: scripts/mod/empty.o] Error 1
>> make[2]: Target '__build' not remade because of errors.
>> make[1]: *** [Makefile:1169: prepare0] Error 2
>> make[1]: Target 'prepare' not remade because of errors.
>> make: *** [Makefile:185: __sub-make] Error 2

The output of gcc-5 -v --version on that machine may help.  The
convoluted gcc_cv_ld_compress_de logic in gcc/configure.ac may be
related, but I can't find any mistake that our
CONFIG_DEBUG_INFO_COMPRESSED conditions may make.