[all-commits] [llvm/llvm-project] dc5cbb: [clang][modules] Add -Wsystem-headers-in-module=

[Ben Langmuir via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: dc5cbba3196db61d57b7d84118732a6c96d8ee64
      https://github.com/llvm/llvm-project/commit/dc5cbba3196db61d57b7d84118732a6c96d8ee64
  Author: Ben Langmuir <blangmuir at apple.com>
  Date:   2023-08-09 (Wed, 09 Aug 2023)

  Changed paths:
    M clang/include/clang/Basic/DiagnosticOptions.h
    M clang/include/clang/Driver/Options.td
    M clang/lib/Driver/ToolChains/Clang.cpp
    M clang/lib/Frontend/CompilerInstance.cpp
    M clang/lib/Serialization/ASTReader.cpp
    M clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
    A clang/test/ClangScanDeps/Wsystem-headers-in-module.c
    A clang/test/Modules/Wsystem-headers-in-module.c

  Log Message:
  -----------
  [clang][modules] Add -Wsystem-headers-in-module=

Add a way to enable -Wsystem-headers only for a specific module. This is
useful for validating a module that would otherwise not see system
header diagnostics without being flooded by diagnostics for unrelated
headers/modules. It's relatively common for a module to be marked
[system] but still wish to validate itself explicitly.

rdar://113401565

Differential Revision: https://reviews.llvm.org/D156948