Firestore C++: compile ExecutorLibdispatch in Objective-C++ mode (#1237)

dispatch_queue_t is defined differently in libdispatch depending on
whether the library header is being include from Objective-C (or
Objective-C++) code, or else from C or C++ code. Make sure that all
source files in Firestore that include executor_libdispatch.h are
compiled in the same mode (Objective-C++) to avoid linker errors.

1 files changed, 41 insertions, 0 deletions

diff --git a/Firestore/core/test/firebase/firestore/util/async_queue_std_test.cc b/Firestore/core/test/firebase/firestore/util/async_queue_std_test.cc
new file mode 100644
index 0000000..9e69ad0
--- /dev/null
+++ b/Firestore/core/test/firebase/firestore/util/async_queue_std_test.cc
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2018 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Firestore/core/test/firebase/firestore/util/async_queue_test.h"
+
+#include "Firestore/core/src/firebase/firestore/util/executor_std.h"
+
+#include "absl/memory/memory.h"
+#include "gtest/gtest.h"
+
+namespace firebase {
+namespace firestore {
+namespace util {
+
+namespace {
+
+std::unique_ptr<internal::Executor> ExecutorFactory() {
+  return absl::make_unique<internal::ExecutorStd>();
+}
+
+}  // namespace
+
+INSTANTIATE_TEST_CASE_P(AsyncQueueStd,
+                        AsyncQueueTest,
+                        ::testing::Values(ExecutorFactory));
+}  // namespace util
+}  // namespace firestore
+}  // namespace firebase