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rocksdb/util/gflags_compat.h

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// Copyright (c) 2017-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#pragma once
#include <gflags/gflags.h>
#include <functional>
#ifndef GFLAGS_NAMESPACE
// in case it's not defined in old versions, that's probably because it was
// still google by default.
#define GFLAGS_NAMESPACE google
#endif
#ifndef DEFINE_uint32
// DEFINE_uint32 / DECLARE_uint32 do not appear in older versions of gflags.
// These should be sane definitions for those versions.
#include <cstdint>
#define DEFINE_uint32(name, val, txt) \
namespace gflags_compat { \
DEFINE_int32(name, val, txt); \
} \
uint32_t &FLAGS_##name = \
*reinterpret_cast<uint32_t *>(&gflags_compat::FLAGS_##name);
#define DECLARE_uint32(name) extern uint32_t &FLAGS_##name;
#endif // !DEFINE_uint32