[modules] Don't bother creating a global module fragment when building a

header module.

llvm-svn: 342307

diff --git a/clang/lib/Sema/Sema.cpp b/clang/lib/Sema/Sema.cpp
index 4b0e69c..d777afe 100644 (file)
--- a/clang/lib/Sema/Sema.cpp
+++ b/clang/lib/Sema/Sema.cpp
@@ -827,7 +827,9 @@ void Sema::emitAndClearUnusedLocalTypedefWarnings() {
 /// is parsed. Note that the ASTContext may have already injected some
 /// declarations.
 void Sema::ActOnStartOfTranslationUnit() {
-  if (getLangOpts().ModulesTS) {
+  if (getLangOpts().ModulesTS &&
+      (getLangOpts().getCompilingModule() == LangOptions::CMK_ModuleInterface ||
+       getLangOpts().getCompilingModule() == LangOptions::CMK_None)) {
     SourceLocation StartOfTU =
         SourceMgr.getLocForStartOfFile(SourceMgr.getMainFileID());