[PATCH 0/2] RISC-V: Fix CONFIG_AS_HAS_OPTION_ARCH with tip of tree LLVM

[Nathan Chancellor]

Hi all,

Eric reported that builds of LLVM with [1] (close to tip of tree) have
CONFIG_AS_HAS_OPTION_ARCH=n because the test for expected failure on
invalid input has started succeeding.

This Kconfig test was added because '.option arch' only causes an
assembler warning when it is unsupported, rather than a hard error,
which is what users of as-instr expect when something is unsupported.

This can be resolved by turning assembler warnings into errors with
'-Wa,--fatal-warnings' like we do with the compiler with '-Werror',
which is what the first patch does. The second patch removes the invalid
test, as the valid test is good enough with fatal warnings.

I have diffed several configurations for the different architectures
that use as-instr and I have found no issues.

I think this could go in through either the kbuild or RISC-V tree with
sufficient acks but I will let them fight over who takes it :)

[1]: https://github.com/llvm/llvm-project/commit/3ac9fe69f70a2b3541266daedbaaa7dc9c007a2a

---
Nathan Chancellor (2):
      kbuild: Add -Wa,--fatal-warnings to as-instr invocation
      RISC-V: Drop invalid test from CONFIG_AS_HAS_OPTION_ARCH

 arch/riscv/Kconfig        | 1 -
 scripts/Kconfig.include   | 2 +-
 scripts/Makefile.compiler | 2 +-
 3 files changed, 2 insertions(+), 3 deletions(-)
---
base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d
change-id: 20240124-fix-riscv-option-arch-llvm-18-3cbe7b09a216

Best regards,
-- 
Nathan Chancellor <nathan at kernel.org>