rcutils  master
C API providing common utilities and data structures.
visibility_control.h
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1 // Copyright 2015 Open Source Robotics Foundation, Inc.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 #ifndef RCUTILS__VISIBILITY_CONTROL_H_
16 #define RCUTILS__VISIBILITY_CONTROL_H_
17 
18 #if __cplusplus
19 extern "C"
20 {
21 #endif
22 
23 // This logic was borrowed (then namespaced) from the examples on the gcc wiki:
24 // https://gcc.gnu.org/wiki/Visibility
25 
26 #if defined _WIN32 || defined __CYGWIN__
27  #ifdef __GNUC__
28  #define RCUTILS_EXPORT __attribute__ ((dllexport))
29  #define RCUTILS_IMPORT __attribute__ ((dllimport))
30  #else
31  #define RCUTILS_EXPORT __declspec(dllexport)
32  #define RCUTILS_IMPORT __declspec(dllimport)
33  #endif
34  #ifdef RCUTILS_BUILDING_DLL
35  #define RCUTILS_PUBLIC RCUTILS_EXPORT
36  #else
37  #define RCUTILS_PUBLIC RCUTILS_IMPORT
38  #endif
39  #define RCUTILS_PUBLIC_TYPE RCUTILS_PUBLIC
40  #define RCUTILS_LOCAL
41 #else
42  #define RCUTILS_EXPORT __attribute__ ((visibility("default")))
43  #define RCUTILS_IMPORT
44  #if __GNUC__ >= 4
45  #define RCUTILS_PUBLIC __attribute__ ((visibility("default")))
46  #define RCUTILS_LOCAL __attribute__ ((visibility("hidden")))
47  #else
48  #define RCUTILS_PUBLIC
49  #define RCUTILS_LOCAL
50  #endif
51  #define RCUTILS_PUBLIC_TYPE
52 #endif
53 
54 #if __cplusplus
55 }
56 #endif
57 
58 #endif // RCUTILS__VISIBILITY_CONTROL_H_