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
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/a998b85bf1d2...
Sorry for not giving you guys more of a heads up about that switch.
Cheers, Nathan
-
Naresh Kamboju -
Nathan Chancellor