Apache Arrow (C++)
A columnar in-memory analytics layer designed to accelerate big data.
visibility.h
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1 // Licensed to the Apache Software Foundation (ASF) under one
2 // or more contributor license agreements. See the NOTICE file
3 // distributed with this work for additional information
4 // regarding copyright ownership. The ASF licenses this file
5 // to you under the Apache License, Version 2.0 (the
6 // "License"); you may not use this file except in compliance
7 // with the License. You may obtain a copy of the License at
8 //
9 // http://www.apache.org/licenses/LICENSE-2.0
10 //
11 // Unless required by applicable law or agreed to in writing,
12 // software distributed under the License is distributed on an
13 // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14 // KIND, either express or implied. See the License for the
15 // specific language governing permissions and limitations
16 // under the License.
17 
18 #ifndef ARROW_UTIL_VISIBILITY_H
19 #define ARROW_UTIL_VISIBILITY_H
20 
21 #if defined(_WIN32) || defined(__CYGWIN__)
22 #if defined(_MSC_VER)
23 #pragma warning(disable : 4251)
24 #else
25 #pragma GCC diagnostic ignored "-Wattributes"
26 #endif
27 
28 #ifdef ARROW_EXPORTING
29 #define ARROW_EXPORT __declspec(dllexport)
30 #else
31 #define ARROW_EXPORT __declspec(dllimport)
32 #endif
33 
34 #define ARROW_NO_EXPORT
35 #else // Not Windows
36 #ifndef ARROW_EXPORT
37 #define ARROW_EXPORT __attribute__((visibility("default")))
38 #endif
39 #ifndef ARROW_NO_EXPORT
40 #define ARROW_NO_EXPORT __attribute__((visibility("hidden")))
41 #endif
42 #endif // Non-Windows
43 
44 // gcc and clang disagree about how to handle template visibility when you have
45 // explicit specializations https://llvm.org/bugs/show_bug.cgi?id=24815
46 
47 #if defined(__clang__)
48 #define ARROW_EXTERN_TEMPLATE extern template class ARROW_EXPORT
49 #else
50 #define ARROW_EXTERN_TEMPLATE extern template class
51 #endif
52 
53 // This is a complicated topic, some reading on it:
54 // http://www.codesynthesis.com/~boris/blog/2010/01/18/dll-export-cxx-templates/
55 #if defined(_MSC_VER) || defined(__clang__)
56 #define ARROW_TEMPLATE_EXPORT ARROW_EXPORT
57 #else
58 #define ARROW_TEMPLATE_EXPORT
59 #endif
60 
61 #endif // ARROW_UTIL_VISIBILITY_H