lib/Serialization/ASTReader.cpp

490   diag::Severity Ext = Diags.getExtensionHandlingBehavior();
491   if (Ext == diag::Severity::Warning && Diags.getWarningsAsErrors())
493   return Ext >= diag::Severity::Error;
3612           auto Ext = ReadString(Record, I);
3613           OpenCLTypeExtMap[Type].insert(Ext);
3624           auto Ext = ReadString(Record, I);
3625           OpenCLDeclExtMap[Decl].insert(Ext);
6922 #define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
11463   for (const auto &Ext : Extensions) {
11464     auto BlockName = Ext->getExtensionMetadata().BlockName;
11472     ModuleFileExtensions.insert({BlockName, Ext});