If a template instantation introduces a name into a namespace, we need to write
out a visible update record for that namespace even if it was never declared in
this module.
llvm-svn: 204554
diff --git a/clang/lib/Serialization/ASTWriterDecl.cpp b/clang/lib/Serialization/ASTWriterDecl.cpp
index d83b3ed..3aeb895 100644
--- a/clang/lib/Serialization/ASTWriterDecl.cpp
+++ b/clang/lib/Serialization/ASTWriterDecl.cpp
@@ -176,6 +176,18 @@
Record.push_back(D->getAccess());
Record.push_back(D->isModulePrivate());
Record.push_back(Writer.inferSubmoduleIDFromLocation(D->getLocation()));
+
+ // If this declaration injected a name into a context different from its
+ // lexical context, and that context is an imported namespace, we need to
+ // update its visible declarations to include this name.
+ //
+ // This happens when we instantiate a class with a friend declaration or a
+ // function with a local extern declaration, for instance.
+ if (D->isOutOfLine()) {
+ auto *NS = dyn_cast<NamespaceDecl>(D->getDeclContext()->getRedeclContext());
+ if (NS && NS->isFromASTFile())
+ Writer.AddUpdatedDeclContext(NS);
+ }
}
void ASTDeclWriter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {