================
@@ -1607,9 +1609,19 @@ void ASTWriter::WriteControlBlock(Preprocessor &PP,
StringRef isysroot) {
AddStringBlob(M.ModuleName, Record, Blob);
Record.push_back(M.StandardCXXModule);
- // We don't want to hard code the information about imported modules
- // in the C++20 named modules.
- if (M.StandardCXXModule) {
+ // We don't want to hard code file information for C++20 Modules
+ // (including explicitly mapped header units).
+ const Module *ImportedModule =
+ PP.getHeaderSearchInfo().getModuleMap().findModule(M.ModuleName);
+ bool IsPrebuiltHeaderUnit =
+ ImportedModule && ImportedModule->isHeaderUnit() &&
+ M.Kind == MK_PrebuiltModule &&
+ HSOpts.PrebuiltModuleFiles.count(M.ModuleName);
+
+ bool HasFileInfo = !M.StandardCXXModule && !IsPrebuiltHeaderUnit;
----------------
ChuanqiXu9 wrote:
The name is not explicit. I prefer something like `IsCXX20ModuleOrHeaderUnit`
https://github.com/llvm/llvm-project/pull/235597
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