================
@@ -5153,13 +5155,28 @@ ASTReader::ReadASTCore(StringRef FileName,
<< moduleKindForDiagnostic(Type) << FileName << !ErrorStr.empty()
<< ErrorStr;
return Failure;
+ case ModuleManager::ExpectationNotMet:
+ if (!MC.isPCMFinal(FileName)) {
+ // The importer expected a different PCM. We don't know for sure whether
+ // it's this PCM that's out of date, or whether it's the importer and it
+ // therefore has out-of-date expectations.
+ // Let's defensively remove this PCM from the in-memory cache so that we
+ // are able to properly validate a fresh one later on.
+ MC.erasePCM(FileName);
+ }
----------------
jansvoboda11 wrote:
Because `tryToDropPCM()` would bring the state for this PCM to `ToBuild` or
`Final`. To force re-loading fresh one from the disk, the state needs to be
`Unknown`.
https://github.com/llvm/llvm-project/pull/177004
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