linux-kernel - Re: [kbuild-all] Re: gcc: error: unrecognized command-line option '-mno-space-regs'

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Date:   Mon, 14 Feb 2022 17:15:19 +0800
From:   "Chen, Rong A" <rong.a.chen@...el.com>
To:     Helge Deller <deller@....de>, kernel test robot <lkp@...el.com>,
        Masahiro Yamada <masahiroy@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: [kbuild-all] Re: gcc: error: unrecognized command-line option
 '-mno-space-regs'



On 2/14/2022 6:26 AM, Helge Deller wrote:
> On 2/13/22 11:39, kernel test robot wrote:
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   b81b1829e7e39f6cebdf6e4d5484eacbceda8554
>> commit: 5f6e0fe01b6b33894cf6f61b359ab5a6d2b7674e parisc: Fix compile failure when building 64-bit kernel natively
>> date:   6 months ago
>> config: parisc64-randconfig-r035-20220213 (https://download.01.org/0day-ci/archive/20220213/202202131837.mZeWy9J4-lkp@intel.com/config)
>> compiler: hppa-linux-gcc (GCC) 11.2.0
>> reproduce (this is a W=1 build):
>>          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>          chmod +x ~/bin/make.cross
>>          # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5f6e0fe01b6b33894cf6f61b359ab5a6d2b7674e
>>          git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>          git fetch --no-tags linus master
>>          git checkout 5f6e0fe01b6b33894cf6f61b359ab5a6d2b7674e
>>          # save the config file to linux build tree
>>          mkdir build_dir
>>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=parisc64 prepare
>>
>> 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 >>):
>>
>>     scripts/genksyms/parse.y: warning: 9 shift/reduce conflicts [-Wconflicts-sr]
>>     scripts/genksyms/parse.y: warning: 5 reduce/reduce conflicts [-Wconflicts-rr]
>>>> gcc: error: unrecognized command-line option '-mno-space-regs'
>>>> gcc: error: unrecognized command-line option '-mno-space-regs'
>>>> gcc: error: unrecognized command-line option '-mfast-indirect-calls'; did you mean '-mforce-indirect-call'?
>>>> gcc: error: unrecognized command-line option '-mfast-indirect-calls'; did you mean '-mforce-indirect-call'?
>>>> gcc: error: unrecognized command-line option '-mdisable-fpregs'
>>>> gcc: error: unrecognized command-line option '-mschedule=7200'
> 
> Same issue as the other error.
> Here a 64bit compiler was used to build a 32-bit kernel...

Hi Helge,

Thanks for the explanation, it seems kernel still can be 32-bit if using
make ARCH=parisc64 randconfig, we'll check CONFIG_64BIT config directly
to decide the ARCH value.

Best Regards,
Rong Chen


> 
> I've queued up a patch in for-next which should give a better error message if
> someone uses such a wrong combination:
> https://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux.git/commit/?h=for-next&id=b160628e9ebcdc85d0db9d7f423c26b3c7c179d0
> 
> Helge
> 
>>     make[2]: *** [scripts/Makefile.build:117: scripts/mod/devicetable-offsets.s] Error 1
> 
>>>> gcc: error: unrecognized command-line option '-mdisable-fpregs'
>>>> gcc: error: unrecognized command-line option '-mschedule=7200'
>>     make[2]: *** [scripts/Makefile.build:271: scripts/mod/empty.o] Error 1
>>     make[2]: Target '__build' not remade because of errors.
>>     make[1]: *** [Makefile:1216: prepare0] Error 2
>>     make[1]: Target 'prepare' not remade because of errors.
>>     make: *** [Makefile:220: __sub-make] Error 2
>>     make: Target 'prepare' not remade because of errors.
>>
>> ---
>> 0-DAY CI Kernel Test Service, Intel Corporation
>> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
>>
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