3 files changed, 6 insertions, 3 deletions
diff --git a/llvm/lib/LTO/LTO.cpp b/llvm/lib/LTO/LTO.cpp
index ed95ac6598c..b599830d092 100644
--- a/llvm/lib/LTO/LTO.cpp
+++ b/llvm/lib/LTO/LTO.cpp
@@ -350,7 +350,8 @@ Error LTO::addRegularLTO(std::unique_ptr<InputFile> Input,
   std::unique_ptr<object::IRObjectFile> Obj = std::move(*ObjOrErr);
 
   Module &M = Obj->getModule();
-  M.materializeMetadata();
+  if (Error Err = M.materializeMetadata())
+    return Err;
   UpgradeDebugInfo(M);
 
   SmallPtrSet<GlobalValue *, 8> Used;
diff --git a/llvm/lib/LTO/LTOBackend.cpp b/llvm/lib/LTO/LTOBackend.cpp
index 0885c0b8484..fb1cfed96bb 100644
--- a/llvm/lib/LTO/LTOBackend.cpp
+++ b/llvm/lib/LTO/LTOBackend.cpp
@@ -359,7 +359,8 @@ Error lto::thinBackend(Config &Conf, unsigned Task, AddStreamFn AddStream,
   };
 
   FunctionImporter Importer(CombinedIndex, ModuleLoader);
-  Importer.importFunctions(Mod, ImportList);
+  if (Error Err = Importer.importFunctions(Mod, ImportList).takeError())
+    return Err;
 
   if (Conf.PostImportModuleHook && !Conf.PostImportModuleHook(Task, Mod))
     return Error();
diff --git a/llvm/lib/LTO/ThinLTOCodeGenerator.cpp b/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
index 2bf4f7a569f..5baecc2bdac 100644
--- a/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
+++ b/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
@@ -152,7 +152,8 @@ crossImportIntoModule(Module &TheModule, const ModuleSummaryIndex &Index,
                       const FunctionImporter::ImportMapTy &ImportList) {
   ModuleLoader Loader(TheModule.getContext(), ModuleMap);
   FunctionImporter Importer(Index, Loader);
-  Importer.importFunctions(TheModule, ImportList);
+  if (!Importer.importFunctions(TheModule, ImportList))
+    report_fatal_error("importFunctions failed");
 }
 
 static void optimizeModule(Module &TheModule, TargetMachine &TM) {