* clang: error: unsupported argument '-mimplicit-it=always' to option 'Wa,'
@ 2021-09-16 13:45 Naresh Kamboju
2021-09-16 15:20 ` Nathan Chancellor
0 siblings, 1 reply; 2+ messages in thread
From: Naresh Kamboju @ 2021-09-16 13:45 UTC (permalink / raw)
To: open list, Greg Kroah-Hartman, Sasha Levin, clang-built-linux,
lkft-triage, llvm, Linux-Next Mailing List
Cc: Nathan Chancellor, Nick Desaulniers, Stephen Rothwell
Following build warnings/ errors noticed while building linux next-20210916
with clang-10, clang-11 and clang-12 for arm architecture.
- allnoconfig
- tinyconfig
But builds PASS with clang-13.
clang: error: unsupported argument '-mimplicit-it=always' to option 'Wa,'
make[2]: *** [/builds/linux/scripts/Makefile.build:288:
scripts/mod/empty.o] Error 1
make[2]: Target '__build' not remade because of errors.
make[1]: *** [/builds/linux/Makefile:1329: prepare0] Error 2
make[1]: Target '__all' not remade because of errors.
make: *** [Makefile:226: __sub-make] Error 2
make: Target '__all' not remade because of errors.
Build config:
https://builds.tuxbuild.com/1yDgHTBClkDVAW6MLcYwAdsXznO/config
Reported-by: Linux Kernel Functional Testing <lkft@linaro•org>
meta data:
--------------
git_describe: next-20210916
git_ref: master
git_repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
git_sha: 368847b165bbfbdcf0bd4c96b167893dcdb13aba
git_short_log: 368847b165bb (\"Add linux-next specific files for 20210916\")
kconfig: [
allnoconfig
],
kernel_version: 5.14.0
target_arch: arm
toolchain: clang-12
Steps to reproduce:
tuxmake --runtime podman --target-arch arm --toolchain clang-12
--kconfig allnoconfig
--
Linaro LKFT
https://lkft.linaro.org
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: clang: error: unsupported argument '-mimplicit-it=always' to option 'Wa,'
2021-09-16 13:45 clang: error: unsupported argument '-mimplicit-it=always' to option 'Wa,' Naresh Kamboju
@ 2021-09-16 15:20 ` Nathan Chancellor
0 siblings, 0 replies; 2+ messages in thread
From: Nathan Chancellor @ 2021-09-16 15:20 UTC (permalink / raw)
To: Naresh Kamboju, open list, Greg Kroah-Hartman, Sasha Levin,
lkft-triage, llvm, Linux-Next Mailing List
Cc: Nick Desaulniers, Stephen Rothwell
Hi Naresh,
On 9/16/2021 6:45 AM, Naresh Kamboju wrote:
> Following build warnings/ errors noticed while building linux next-20210916
> with clang-10, clang-11 and clang-12 for arm architecture.
> - allnoconfig
> - tinyconfig
>
> But builds PASS with clang-13.
>
> clang: error: unsupported argument '-mimplicit-it=always' to option 'Wa,'
> make[2]: *** [/builds/linux/scripts/Makefile.build:288:
> scripts/mod/empty.o] Error 1
> make[2]: Target '__build' not remade because of errors.
> make[1]: *** [/builds/linux/Makefile:1329: prepare0] Error 2
> make[1]: Target '__all' not remade because of errors.
> make: *** [Makefile:226: __sub-make] Error 2
> make: Target '__all' not remade because of errors.
Thank you for the report. This is caused by the implicit switch to the
integrated assembler in commit f12b034afeb3 ("scripts/Makefile.clang:
default to LLVM_IAS=1").
Prior to LLVM 13, -Wa,-mimplicit-it=... was not properly handled by the
integrated assembler but Nick fixed that:
https://github.com/ClangBuiltLinux/linux/issues/1270
As noted in the above Linux commit, please adjust arm clang-10 through
clang-12 builds with TuxSuite to pass 'LLVM_IAS=0' to make, which you
can do with the 'make_variables' key:
https://github.com/ClangBuiltLinux/continuous-integration2/blob/a998b85bf1d2ce4150005b225f4cde535fe12af5/tuxsuite/android-mainline.tux.yml#L207
Sorry for not giving you guys more of a heads up about that switch.
Cheers,
Nathan
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