visibility_control_macros.h

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// Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// 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.
 
#ifndef RCUTILS__VISIBILITY_CONTROL_MACROS_H_
#define RCUTILS__VISIBILITY_CONTROL_MACROS_H_
 
 
#if defined(_MSC_VER) || defined(__CYGWIN__)
// Use the Windows syntax when compiling with Microsoft Visual C++.
//
// GCC on Windows also support this syntax. When compiling with cygwin,
// prefer using dllimport/dllexport are the semantic of those flags is closer
// to msvc++ behavior. See GCC documentation:
// https://gcc.gnu.org/onlinedocs/gcc/Microsoft-Windows-Function-Attributes.html
# define RCUTILS_IMPORT __declspec(dllimport)
# define RCUTILS_EXPORT __declspec(dllexport)
# define RCUTILS_LOCAL
#else  // defined(_MSC_VER) || defined(__CYGWIN__)
// On Linux, use the GCC syntax. This syntax is understood by other compilers
// such as clang, icpc, and xlc++.
# define RCUTILS_IMPORT __attribute__ ((visibility("default")))
# define RCUTILS_EXPORT __attribute__ ((visibility("default")))
# define RCUTILS_LOCAL  __attribute__ ((visibility("hidden")))
#endif  // !defined(_MSC_VER) && !defined(__CYGWIN__)
 
#endif  // RCUTILS__VISIBILITY_CONTROL_MACROS_H_