1 files changed, 7 insertions, 2 deletions
diff --git a/clang/lib/Frontend/FrontendActions.cpp b/clang/lib/Frontend/FrontendActions.cpp
index 88ff7e0..d83e98f 100644
--- a/clang/lib/Frontend/FrontendActions.cpp
+++ b/clang/lib/Frontend/FrontendActions.cpp
@@ -615,14 +615,19 @@ void DumpModuleInfoAction::ExecuteAction() {
   llvm::raw_ostream &Out = OutFile.get()? *OutFile.get() : llvm::outs();
 
   Out << "Information for module file '" << getCurrentFile() << "':\n";
+  auto &FileMgr = getCompilerInstance().getFileManager();
+  auto Buffer = FileMgr.getBufferForFile(getCurrentFile());
+  StringRef Magic = (*Buffer)->getMemBufferRef().getBuffer();
+  bool IsRaw = (Magic.size() >= 4 && Magic[0] == 'C' && Magic[1] == 'P' &&
+                Magic[2] == 'C' && Magic[3] == 'H');
+  Out << "  Module format: " << (IsRaw ? "raw" : "obj") << "\n";
 
   Preprocessor &PP = getCompilerInstance().getPreprocessor();
   DumpModuleInfoListener Listener(Out);
   HeaderSearchOptions &HSOpts =
       PP.getHeaderSearchInfo().getHeaderSearchOpts();
   ASTReader::readASTFileControlBlock(
-      getCurrentFile(), getCompilerInstance().getFileManager(),
-      getCompilerInstance().getPCHContainerReader(),
+      getCurrentFile(), FileMgr, getCompilerInstance().getPCHContainerReader(),
       /*FindModuleFileExtensions=*/true, Listener,
       HSOpts.ModulesValidateDiagnosticOptions);
 }