Program Listing for File utils_visibility_control.h
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// Copyright 2020 Microsoft Corporation.
//
// 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.
/* This header must be included by all rclcpp headers which declare symbols
* which are defined in the rclcpp library. When not building the rclcpp
* library, i.e. when using the headers in other package's code, the contents
* of this header change the visibility of certain symbols which the rclcpp
* library cannot have, but the consuming code must have inorder to link.
*/
#ifndef GAZEBO_ROS__UTILS_VISIBILITY_CONTROL_H_
#define GAZEBO_ROS__UTILS_VISIBILITY_CONTROL_H_
// This logic was borrowed (then namespaced) from the examples on the gcc wiki:
// https://gcc.gnu.org/wiki/Visibility
#if defined _WIN32 || defined __CYGWIN__
#ifdef __GNUC__
#define GAZEBO_ROS_UTILS_EXPORT __attribute__ ((dllexport))
#define GAZEBO_ROS_UTILS_IMPORT __attribute__ ((dllimport))
#else
#define GAZEBO_ROS_UTILS_EXPORT __declspec(dllexport)
#define GAZEBO_ROS_UTILS_IMPORT __declspec(dllimport)
#endif
#ifdef GAZEBO_ROS_UTILS_BUILDING_DLL
#define GAZEBO_ROS_UTILS_PUBLIC GAZEBO_ROS_UTILS_EXPORT
#else
#define GAZEBO_ROS_UTILS_PUBLIC GAZEBO_ROS_UTILS_IMPORT
#endif
#define GAZEBO_ROS_UTILS_PUBLIC_TYPE GAZEBO_ROS_UTILS_PUBLIC
#define GAZEBO_ROS_UTILS_LOCAL
#else
#define GAZEBO_ROS_UTILS_EXPORT __attribute__ ((visibility("default")))
#define GAZEBO_ROS_UTILS_IMPORT
#if __GNUC__ >= 4
#define GAZEBO_ROS_UTILS_PUBLIC __attribute__ ((visibility("default")))
#define GAZEBO_ROS_UTILS_LOCAL __attribute__ ((visibility("hidden")))
#else
#define GAZEBO_ROS_UTILS_PUBLIC
#define GAZEBO_ROS_UTILS_LOCAL
#endif
#define GAZEBO_ROS_UTILS_PUBLIC_TYPE
#endif
#endif // GAZEBO_ROS__UTILS_VISIBILITY_CONTROL_H_