[all-commits] [llvm/llvm-project] 5ecb51: [Driver] Pass -plugin-opt=O2 for -Os -Oz and -plug...

[Fangrui Song via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 5ecb51414637402b0f89a96924ac7b015d23bcfa
      https://github.com/llvm/llvm-project/commit/5ecb51414637402b0f89a96924ac7b015d23bcfa
  Author: Fangrui Song <maskray at google.com>
  Date:   2020-05-14 (Thu, 14 May 2020)

  Changed paths:
    M clang/lib/Driver/ToolChains/CommonArgs.cpp
    M clang/test/Driver/lto.c

  Log Message:
  -----------
  [Driver] Pass -plugin-opt=O2 for -Os -Oz and -plugin-opt=O1 for -Og

Fixes PR42445 (compiler driver options -Os -Oz translate to
-plugin-opt=Os (Oz) which are not recognized by LLVMgold.so or LLD).

The optimization level mapping matches
CompilerInvocation.cpp:getOptimizationLevel() and SpeedLevel of
PassBuilder::OptimizationLevel::O*.

-plugin-opt=O* affects the way we construct regular LTO/ThinLTO pass
manager pipeline.

Reviewed By: pcc

Differential Revision: https://reviews.llvm.org/D79919