[PATCH] D155326: [Clang][lld][RISCV] Passing 'mattr' to lld/llvmgold

[Yingwei Zheng via Phabricator via cfe-commits]

dtcxzyw created this revision.
dtcxzyw added reviewers: MaskRay, jrtc27, kito-cheng, craig.topper.
dtcxzyw added projects: lld, clang.
Herald added subscribers: jobnoorman, VincentWu, vkmr, luismarques, sameer.abuasal, s.egerton, Jim, benna, psnobl, PkmX, rogfer01, shiva0217, simoncook, arichardson, emaste.
Herald added a project: All.
dtcxzyw requested review of this revision.
Herald added subscribers: llvm-commits, cfe-commits, wangpc, eopXD.
Herald added a project: LLVM.

When building applications with LTO/ThinLTO, lld and llvmgold emit wrong `.riscv.attributes` sections due to the lack of sub-target features (`codegen::getMAttrs()` returns empty).
This patch adds a new plugin option `mattr` for lld and llvmgold, to get right module-level sub-target features for temporary ELF objects generated from llvm bitcode.

I think it is a better solution than merging func-level sub-target features like D142191 <https://reviews.llvm.org/D142191>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D155326

Files:
  clang/lib/Driver/ToolChains/Arch/CSKY.cpp
  clang/lib/Driver/ToolChains/Arch/CSKY.h
  clang/lib/Driver/ToolChains/CommonArgs.cpp
  lld/ELF/Driver.cpp
  lld/ELF/Options.td
  llvm/tools/gold/gold-plugin.cpp

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