linux-kernel - Re: llvm-objcopy: error: invalid output format: 'elf64-s390'

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Date:   Sat, 28 May 2022 09:21:55 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Heiko Carstens <hca@...ux.ibm.com>, llvm@...ts.linux.dev,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: llvm-objcopy: error: invalid output format: 'elf64-s390'

On Sun, May 29, 2022 at 12:04:48AM +0800, kernel test robot wrote:
> Hi Heiko,
> 
> FYI, the error/warning still remains.
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   9d004b2f4fea97cde123e7f1939b80e77bf2e695
> commit: adda746629b4a3950f313bc645fa0e54daee871c s390/purgatory: workaround llvm's IAS limitations
> date:   11 days ago
> config: s390-randconfig-c005-20220527 (https://download.01.org/0day-ci/archive/20220529/202205290045.gOvUOkt3-lkp@intel.com/config)
> compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0fbe3f3f486e01448121f7931a4ca29fac1504ab)
> 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
>         # install s390 cross compiling tool for clang build
>         # apt-get install binutils-s390x-linux-gnu
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=adda746629b4a3950f313bc645fa0e54daee871c
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout adda746629b4a3950f313bc645fa0e54daee871c
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>):
> 
> >> llvm-objcopy: error: invalid output format: 'elf64-s390'

This is expected, as llvm-objcopy needs support for s390:
https://github.com/ClangBuiltLinux/linux/issues/1530

Please use GNU objcopy for the time being by explicitly providing
OBJCOPY=${CROSS_COMPILE}objcopy to make.

Cheers,
Nathan