[all-commits] [llvm/llvm-project] f9c0d1: [Driver] Add -f[no-]legacy-pass-manager to superse...

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f9c0d1b0562c4789638a91ce97f1c2d99608005b
      https://github.com/llvm/llvm-project/commit/f9c0d1b0562c4789638a91ce97f1c2d99608005b
  Author: Fangrui Song <i at maskray.me>
  Date:   2020-12-09 (Wed, 09 Dec 2020)

  Changed paths:
    M clang/include/clang/Basic/CodeGenOptions.def
    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
    M clang/lib/Frontend/CompilerInvocation.cpp
    M clang/test/Driver/clang_f_opts.c
    A clang/test/Driver/flegacy-pass-manager.c
    R clang/test/Driver/gold-lto-new-pass-man.c

  Log Message:
  -----------
  [Driver] Add -f[no-]legacy-pass-manager to supersede -f[no-]experimental-new-pass-manager

The new PM is considered stable and many downstream groups have adopted it (some
have adopted it for more than two years). Add -f[no-]legacy-pass-manager to reflect the
fact that it is no longer experimental and the legacy pass manager is something we strive to retire.

In the future, when the legacy PM eventually goes away,
-fno-experimental-new-pass-manager and -flegacy-pass-manager will be removed.

This patch also changes -f[no-]legacy-pass-manager to pass `-plugin-opt={new,legacy}-pass-manager` to the linker (supported by both ld.lld and LLVMgold.so) when -flto/-flto=thin is specified

Reviewed By: aeubanks, rsmith

Differential Revision: https://reviews.llvm.org/D92915