[all-commits] [llvm/llvm-project] 04a1a3: [Driver] Add -Wa, options --crel and --allow-exper...

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 04a1a3482ce3ee00b5bbec1ce852e58410e4b6ad
      https://github.com/llvm/llvm-project/commit/04a1a3482ce3ee00b5bbec1ce852e58410e4b6ad
  Author: Fangrui Song <i at maskray.me>
  Date:   2024-07-03 (Wed, 03 Jul 2024)

  Changed paths:
    M clang/include/clang/Basic/CodeGenOptions.def
    M clang/include/clang/Basic/DiagnosticDriverKinds.td
    M clang/include/clang/Driver/Options.td
    M clang/lib/CodeGen/BackendUtil.cpp
    M clang/lib/Driver/ToolChains/Clang.cpp
    M clang/lib/Driver/ToolChains/CommonArgs.cpp
    A clang/test/Driver/crel.c
    A clang/test/Misc/cc1as-crel.s
    M clang/tools/driver/cc1as_main.cpp

  Log Message:
  -----------
  [Driver] Add -Wa, options --crel and --allow-experimental-crel

The two options are discussed in a few comments around
https://github.com/llvm/llvm-project/pull/91280#issuecomment-2099344079

* -Wa,--crel: error "-Wa,--allow-experimental-crel must be specified to use -Wa,--crel..."
* -Wa,--allow-experimental-crel: no-op
* -Wa,--crel,--allow-experimental-crel: enable CREL in the integrated assembler (#91280)

MIPS's little-endian n64 ABI messed up the `r_info` field in
relocations. While this could be fixed with CREL, my intention is to
avoid complication in assembler/linker. The implementation simply
doesn't allow CREL for MIPS.

Link: https://discourse.llvm.org/t/rfc-crel-a-compact-relocation-format-for-elf/77600

Pull Request: https://github.com/llvm/llvm-project/pull/97378



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