1 files changed, 12 insertions, 0 deletions
diff --git a/lib/Sema/Sema.cpp b/lib/Sema/Sema.cpp
index 34f5e26be8104..dc9f977d41ac2 100644
--- a/lib/Sema/Sema.cpp
+++ b/lib/Sema/Sema.cpp
@@ -705,6 +705,18 @@ void Sema::emitAndClearUnusedLocalTypedefWarnings() {
   UnusedLocalTypedefNameCandidates.clear();
 }
 
+/// This is called before the very first declaration in the translation unit
+/// is parsed. Note that the ASTContext may have already injected some
+/// declarations.
+void Sema::ActOnStartOfTranslationUnit() {
+  if (getLangOpts().ModulesTS) {
+    // We start in the global module; all those declarations are implicitly
+    // module-private (though they do not have module linkage).
+    Context.getTranslationUnitDecl()->setModuleOwnershipKind(
+        Decl::ModuleOwnershipKind::ModulePrivate);
+  }
+}
+
 /// ActOnEndOfTranslationUnit - This is called at the very end of the
 /// translation unit when EOF is reached and all but the top-level scope is
 /// popped.