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