PR21909: Don't try (and crash) to generate debug info for explicit instantiations...

llvm-svn: 224394

diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 87bd955..25aaa30 100644 (file)
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -3283,7 +3283,8 @@ void CodeGenModule::EmitTopLevelDecl(Decl *D) {
   case Decl::ClassTemplateSpecialization: {
     const auto *Spec = cast<ClassTemplateSpecializationDecl>(D);
     if (DebugInfo &&
-        Spec->getSpecializationKind() == TSK_ExplicitInstantiationDefinition)
+        Spec->getSpecializationKind() == TSK_ExplicitInstantiationDefinition &&
+        Spec->hasDefinition())
       DebugInfo->completeTemplateDefinition(*Spec);
     break;
   }

diff --git a/clang/test/CodeGenCXX/debug-info-template-explicit-specialization.cpp b/clang/test/CodeGenCXX/debug-info-template-explicit-specialization.cpp
index 506c0d5..4613038 100644 (file)
--- a/clang/test/CodeGenCXX/debug-info-template-explicit-specialization.cpp
+++ b/clang/test/CodeGenCXX/debug-info-template-explicit-specialization.cpp
@@ -91,3 +91,11 @@ struct j {
 extern template class j<int>;
 j<int> jj;
 // CHECK: ; [ DW_TAG_structure_type ] [j<int, int>]
+
+template <typename T>
+struct k {
+};
+template <>
+struct k<int>;
+template struct k<int>;
+// CHECK-NOT: ; [ DW_TAG_structure_type ] [k<int>]