[kbuild:kbuild 14/16] Error: kernelrelease not valid - run 'make prepare' to update it

[kernel test robot]

tree: https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git kbuild
head: 3f482040592dd9aec4578cb49af7664f4a8375d4
commit: b0600f0d9b549348ec6516be2596eb81cd04c55d [14/16] kbuild: check the minimum assembler version in Kconfig
config: x86_64-randconfig-a015-20210329 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 821547cabb5819ed42245376a9afcd11cdee5ddd)
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 x86_64 cross compiling tool for clang build
# apt-get install binutils-x86-64-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git/commit/?id=b0600f0d9b549348ec6516be2596eb81cd04c55d
git remote add kbuild https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git
git fetch --no-tags kbuild kbuild
git checkout b0600f0d9b549348ec6516be2596eb81cd04c55d
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <l...@intel.com>

All errors (new ones prefixed by >>):

>> Error: kernelrelease not valid - run 'make prepare' to update it
--
clang -no-integrated-as --prefix=/usr/bin/ -Werror=unknown-warning-option: unknown assembler invoked
scripts/Kconfig.include:50: Sorry, this assembler is not supported.
make[3]: *** [scripts/kconfig/Makefile:63: syncconfig] Error 1
make[2]: *** [Makefile:617: syncconfig] Error 2
make[1]: *** [Makefile:726: include/config/auto.conf.cmd] Error 2
make[1]: Failed to remake makefile 'include/config/auto.conf.cmd'.
make[1]: Failed to remake makefile 'include/config/auto.conf'.
make[1]: *** [arch/x86/Makefile:283: checkbin] Error 1
>> Error: kernelrelease not valid - run 'make prepare' to update it
make[1]: Target 'prepare' not remade because of errors.
make: *** [Makefile:215: __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/kbuil...@lists.01.org

[Masahiro Yamada]

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I will fix as follows:

Author: Masahiro Yamada <masa...@kernel.org>
Date: Mon Mar 29 08:17:03 2021 +0900

fix

Signed-off-by: Masahiro Yamada <masa...@kernel.org>

diff --git a/scripts/as-version.sh b/scripts/as-version.sh
index 11f1e7b24bff..8b9410e329df 100755
--- a/scripts/as-version.sh
+++ b/scripts/as-version.sh
@@ -45,7 +45,7 @@ orig_args="$@"
# Get the first line of the --version output.
IFS='
'
-set -- $(LC_ALL=C "$@" -Wa,--version -c -x assembler /dev/null -o
/dev/null 2>&1)
+set -- $(LC_ALL=C "$@" -Wa,--version -c -x assembler /dev/null -o
/dev/null 2>/dev/null)

# Split the line on spaces.
IFS=' '


--
Best Regards
Masahiro Yamada