[clang] b768b39 - [C++20] [Modules] Skip Writing diagnostic options, header search paths and pragma diagnostic mappings

[Chuanqi Xu via cfe-commits]

Author: Chuanqi Xu
Date: 2023-12-07T16:54:00+08:00
New Revision: b768b393429419d27e3f76518842136bac9d5b25

URL: https://github.com/llvm/llvm-project/commit/b768b393429419d27e3f76518842136bac9d5b25
DIFF: https://github.com/llvm/llvm-project/commit/b768b393429419d27e3f76518842136bac9d5b25.diff

LOG: [C++20] [Modules] Skip Writing diagnostic options, header search paths and pragma diagnostic mappings

It simply wastes of space and time to write diagnostic options, header
search paths and pragma diagnostic mappings for C++20 Named modules.
This patch tries to avoid the unnecessary writings.

Added: 
    

Modified: 
    clang/include/clang/Frontend/FrontendActions.h
    clang/lib/Frontend/FrontendActions.cpp

Removed: 
    


################################################################################
diff  --git a/clang/include/clang/Frontend/FrontendActions.h b/clang/include/clang/Frontend/FrontendActions.h
index 3940e00eeb8db..fcce31ac0590f 100644
--- a/clang/include/clang/Frontend/FrontendActions.h
+++ b/clang/include/clang/Frontend/FrontendActions.h
@@ -151,6 +151,9 @@ class GenerateModuleInterfaceAction : public GenerateModuleAction {
 private:
   bool BeginSourceFileAction(CompilerInstance &CI) override;
 
+  std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
+                                                 StringRef InFile) override;
+
   std::unique_ptr<raw_pwrite_stream>
   CreateOutputFile(CompilerInstance &CI, StringRef InFile) override;
 };

diff  --git a/clang/lib/Frontend/FrontendActions.cpp b/clang/lib/Frontend/FrontendActions.cpp
index 2afcf1cf9f68c..c1d6e71455365 100644
--- a/clang/lib/Frontend/FrontendActions.cpp
+++ b/clang/lib/Frontend/FrontendActions.cpp
@@ -258,6 +258,16 @@ bool GenerateModuleInterfaceAction::BeginSourceFileAction(
   return GenerateModuleAction::BeginSourceFileAction(CI);
 }
 
+std::unique_ptr<ASTConsumer>
+GenerateModuleInterfaceAction::CreateASTConsumer(CompilerInstance &CI,
+                                                 StringRef InFile) {
+  CI.getHeaderSearchOpts().ModulesSkipDiagnosticOptions = true;
+  CI.getHeaderSearchOpts().ModulesSkipHeaderSearchPaths = true;
+  CI.getHeaderSearchOpts().ModulesSkipPragmaDiagnosticMappings = true;
+
+  return GenerateModuleAction::CreateASTConsumer(CI, InFile);
+}
+
 std::unique_ptr<raw_pwrite_stream>
 GenerateModuleInterfaceAction::CreateOutputFile(CompilerInstance &CI,
                                                 StringRef InFile) {