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
