[LLDB] Initialize ClangImporter with -gmodules

Author: adrian-prantl

lldb/source/Plugins/TypeSystem/Swift/SwiftASTContext.cpp

@@ -3037,6 +3037,7 @@ lldb::TypeSystemSP SwiftASTContext::CreateInstance(
     // perform implicit Clang module imports. They will always use the SDK
     // version as deployment target, even if that is in the future. To
     // avoid building modules twice, match this behavior.
+    auto &ci_args = swift_ast_sp->GetClangImporterOptions().ExtraArgs;
     auto darwin_sdk_info = clang::parseDarwinSDKInfo(
         *llvm::vfs::getRealFileSystem(), swift_ast_sp->GetPlatformSDKPath());
     if (!darwin_sdk_info)
@@ -3045,10 +3046,11 @@ lldb::TypeSystemSP SwiftASTContext::CreateInstance(
       auto sdk_triple = triple;
       sdk_triple.setOSName(std::string(triple.getOSTypeName(triple.getOS())) +
                            (*darwin_sdk_info)->getVersion().getAsString());
-      auto &ci_args = swift_ast_sp->GetClangImporterOptions().ExtraArgs;
       ci_args.push_back("-target");
       ci_args.push_back(sdk_triple.str());
     }
+    ci_args.push_back("-gmodules");
+    ci_args.push_back("-g");
   }
 
   std::vector<swift::PluginSearchOption> plugin_search_options;