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-rw-r--r--lib/Serialization/ASTReaderDecl.cpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/Serialization/ASTReaderDecl.cpp b/lib/Serialization/ASTReaderDecl.cpp
index abab88a9c6..82f6fae4a0 100644
--- a/lib/Serialization/ASTReaderDecl.cpp
+++ b/lib/Serialization/ASTReaderDecl.cpp
@@ -1512,6 +1512,10 @@ ASTDeclReader::VisitRedeclarable(Redeclarable<T> *D) {
template<typename T>
void ASTDeclReader::mergeRedeclarable(Redeclarable<T> *D,
RedeclarableResult &Redecl) {
+ // If modules are not available, there is no reason to perform this merge.
+ if (!Reader.getContext().getLangOptions().Modules)
+ return;
+
if (FindExistingResult ExistingRes = findExisting(static_cast<T*>(D))) {
if (T *Existing = ExistingRes) {
T *ExistingCanon = Existing->getCanonicalDecl();