[all-commits] [llvm/llvm-project] fd11a2: [AArch64] handle -Wa, -march=

[Jian Cai via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fd11a26d368c5a909fb88548fef2cee7a6c2c931
      https://github.com/llvm/llvm-project/commit/fd11a26d368c5a909fb88548fef2cee7a6c2c931
  Author: Jian Cai <caij2003 at gmail.com>
  Date:   2021-06-07 (Mon, 07 Jun 2021)

  Changed paths:
    M clang/lib/Driver/ToolChains/Arch/AArch64.cpp
    M clang/lib/Driver/ToolChains/Arch/AArch64.h
    M clang/lib/Driver/ToolChains/Clang.cpp
    A clang/test/Driver/aarch64-target-as-march.s

  Log Message:
  -----------
  [AArch64] handle -Wa,-march=

This fixed PR#48894 for AArch64. The issue has been fixed for Arm in
https://reviews.llvm.org/D95872

The following rules apply to -Wa,-march with this change:
  - Only compiler options apply to non assembly files
  - Compiler and assembler options apply to assembly files
  - For assembly files, we prefer the assembler option(s) if we have both kinds of option
  - Of the options that apply (or are preferred), the last value wins (it's not additive)

Reviewed By: DavidSpickett, nickdesaulniers

Differential Revision: https://reviews.llvm.org/D103184