[all-commits] [llvm/llvm-project] 3baadf: [CMake] Remove CLANG_DEFAULT_STD_C/CLANG_DEFAULT_S...

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3baadff896eddfa09fcd458d120bac95491992a7
      https://github.com/llvm/llvm-project/commit/3baadff896eddfa09fcd458d120bac95491992a7
  Author: Fangrui Song <i at maskray.me>
  Date:   2022-10-16 (Sun, 16 Oct 2022)

  Changed paths:
    M clang/CMakeLists.txt
    M clang/include/clang/Config/config.h.cmake
    M clang/lib/Basic/LangStandards.cpp
    M clang/test/Preprocessor/lang-std.cpp
    M clang/test/lit.cfg.py
    M clang/test/lit.site.cfg.py.in
    M llvm/utils/gn/secondary/clang/include/clang/Config/BUILD.gn
    M llvm/utils/gn/secondary/clang/test/BUILD.gn
    M utils/bazel/llvm-project-overlay/clang/include/clang/Config/config.h

  Log Message:
  -----------
  [CMake] Remove CLANG_DEFAULT_STD_C/CLANG_DEFAULT_STD_CXX

When Clang is used as a cross compiler, it should respect the target
platform default. Defaulting to a configure-time CLANG_DEFAULT_STD_C/CLANG_DEFAULT_STD_CXX
does not make much sense.

When Clang is used as a single-platform compiler, we should use Clang
configuration file (https://discourse.llvm.org/t/configuration-files/42529
https://clang.llvm.org/docs/UsersManual.html#configuration-files).

The Gentoo needs from D34365 has been satisfied by a configuration file.

Reviewed By: mgorny

Differential Revision: https://reviews.llvm.org/D133375