[MRE] cant resolve static variable offset for templated class

Author: Vipul-Cariappa

lib/CppInterOp/CppInterOp.cpp

@@ -1492,7 +1492,8 @@ intptr_t GetVariableOffset(compat::Interpreter& I, Decl* D,
 #ifdef CPPINTEROP_USE_CLING
         cling::Interpreter::PushTransactionRAII RAII(&getInterp());
 #endif // CPPINTEROP_USE_CLING
-        getSema().InstantiateVariableDefinition(SourceLocation(), VD);
+        getSema().InstantiateVariableDefinition(SourceLocation(), VD, true,
+                                                true);
       }
       if (VD->hasInit() &&
           (VD->isConstexpr() || VD->getType().isConstQualified())) {

unittests/CppInterOp/VariableReflectionTest.cpp

@@ -318,6 +318,28 @@ TEST(VariableReflectionTest, GetVariableOffset) {
   EXPECT_EQ(Cpp::GetVariableOffset(datamembers[0]), offsetof(K, x));
   EXPECT_EQ(Cpp::GetVariableOffset(datamembers[1]), offsetof(K, y));
   EXPECT_EQ(Cpp::GetVariableOffset(datamembers[2]), offsetof(K, z));
+
+  Cpp::Declare(R"(
+    template <typename T> struct ClassWithStatic {
+      static T const ref_value;
+    };
+    template <typename T> T constexpr ClassWithStatic<T>::ref_value = 42;
+  )");
+
+  Cpp::TCppScope_t klass = Cpp::GetNamed("ClassWithStatic");
+  EXPECT_TRUE(klass);
+
+  ASTContext& C = Interp->getCI()->getASTContext();
+  std::vector<Cpp::TemplateArgInfo> template_args = {
+      {C.IntTy.getAsOpaquePtr()}};
+  Cpp::TCppScope_t klass_instantiated = Cpp::InstantiateTemplate(
+      klass, template_args.data(), template_args.size());
+  EXPECT_TRUE(klass_instantiated);
+
+  Cpp::TCppScope_t var = Cpp::GetNamed("ref_value", klass_instantiated);
+  EXPECT_TRUE(var);
+
+  EXPECT_TRUE(Cpp::GetVariableOffset(var));
 }
 
 #define CODE                                                                   \