[all-commits] [llvm/llvm-project] 6f2983: Reland: "[Frontend][PCH]-Add support for ignoring ...

[Ying Yi via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6f2983765983b9403ae40430da8034d2d1b6e8a4
      https://github.com/llvm/llvm-project/commit/6f2983765983b9403ae40430da8034d2d1b6e8a4
  Author: Ying Yi <ying.yi at sony.com>
  Date:   2025-06-17 (Tue, 17 Jun 2025)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/docs/UsersManual.rst
    M clang/include/clang/Driver/Options.td
    M clang/lib/Driver/Driver.cpp
    M clang/lib/Driver/ToolChains/Clang.cpp
    A clang/test/Driver/ignored-pch.cpp
    A clang/test/PCH/Inputs/ignored-pch.h
    A clang/test/PCH/ignored-pch.c

  Log Message:
  -----------
  Reland: "[Frontend][PCH]-Add support for ignoring PCH options (-ignore-pch). (#142409)" (#143614)

Visual Studio has an argument to ignore all PCH related switches.
clang-cl has also support option /Y-. Having the same option in clang
would be helpful. This commit is to add support for ignoring PCH options
(-ignore-pch).

The commit includes:
  1. Implement -ignore-pch as a Driver option.
  2. Add a Driver test and a PCH test.
  3. Add a section of -ignore-pch to user manual.
  4. Add a release note for the new option '-ignore-pch'.

The change since the original landing:
  1. preprocessing-only mode doesn't imply that -include-pch is disabled.

Co-authored-by: Matheus Izvekov <mizvekov at gmail.com>



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