linux-kernel - Re: gcc: error: unrecognized command-line option '-mno-space-regs'

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Date:   Sun, 13 Feb 2022 23:26:10 +0100
From:   Helge Deller <deller@....de>
To:     kernel test robot <lkp@...el.com>,
        Masahiro Yamada <masahiroy@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: gcc: error: unrecognized command-line option '-mno-space-regs'

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...

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
>