Allow use of ^blocks, even with the 10.5 SDK, and even with a 10.5 runtime

chrome/browser/mac/closure_blocks_leopard_compat_unittest.cc

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+#include "base/mac/mac_util.h"
+#include "chrome/browser/mac/closure_blocks_leopard_compat.h"
+
+namespace {
+
+// It should be possible to declare a block on OSes as early as Leopard
+// (10.5). This should be buildable with the 10.5 SDK and a 10.5 deployment
+// target, and runnable on 10.5. However, the block itself is not expected to
+// be runnable on 10.5. This test verfies that blocks are buildable on 10.5
+// and runnable on Snow Leopard (10.6) and later.
+TEST(ClosureBlocksLeopardCompatTest, Basic) {
+  bool ran = false;
+
+  void (^test_block)(bool*) = ^(bool* ran_pointer) { *ran_pointer = true; };
+
+  ASSERT_FALSE(ran);
+
+  if (base::mac::IsOSSnowLeopardOrLater()) {
+    test_block(&ran);
+
+    ASSERT_TRUE(ran);
+  }
+}
+
+}  // namespace