================
@@ -3349,10 +3351,29 @@ ASTReader::ReadControlBlock(ModuleFile &F,
.getModuleCache()
.getInMemoryModuleCache()
.isPCMFinal(F.FileName);
- if (isDiagnosedResult(Result, Capabilities) || recompilingFinalized)
+ if (isDiagnosedResult(Result, Capabilities) || recompilingFinalized) {
Diag(diag::note_module_file_imported_by)
<< F.FileName << !F.ModuleName.empty() << F.ModuleName;
+ // When a Filemap is used, the ImportedFile may be different than what
+ // was encoded as a dependency in StoredFile.
+ // When this happens, look up both files when reporting that they
+ // differ. If either file does not exist, fall back to a string path
+ // check.
+ if (UseFilemap && !F.ModuleName.empty() && !StoredFile.empty()) {
+ auto ImportedFileRef =
+ PP.getFileManager().getOptionalFileRef(ImportedFile);
+ auto StoredFileRef =
+ PP.getFileManager().getOptionalFileRef(StoredFile);
+ const bool MissingFiles = !ImportedFileRef || !StoredFileRef;
+ if ((MissingFiles && (StoredFile != ImportedFile)) ||
----------------
jansvoboda11 wrote:
> `StoredFile` is never checked for existence anywhere else
That makes sense.
> & this code path can only happen if `ImportedFile` existed at the time of
> `lookupModuleFile`.
Then `FileManager` will never report it as missing after that point, unless I'm
missing something.
> It would be nice to reuse the FileEntry created by the ModuleManager, but it
> goes out of scope by the time this check happens.
Does it? It seems like it gets stored as `ModuleFile::File`.
https://github.com/llvm/llvm-project/pull/136612
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