Make CHECK not print messages in official builds

base/check_example.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.
+
+// This file is meant for analyzing the code generated by the CHECK
+// macros in a small executable file that's easy to disassemble.
+
+#include "base/logging.h"
+
+// An official build shouldn't generate code to print out messages for
+// the CHECK* macros, nor should it have the strings in the
+// executable.
+
+void DoCheck(bool b) {
+  CHECK(b) << "DoCheck " << b;
+}
+
+void DoCheckEq(int x, int y) {
+  CHECK_EQ(x, y);
+}
+
+int main(int argc, const char* argv[]) {
+  DoCheck(argc > 1);
+  DoCheckEq(argc, 1);
+}