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
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5 // to you under the Apache License, Version 2.0 (the
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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
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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_STATIC
29 #define ARROW_EXPORT
30 #elif defined(ARROW_EXPORTING)
31 #define ARROW_EXPORT __declspec(dllexport)
32 #else
33 #define ARROW_EXPORT __declspec(dllimport)
34 #endif
35 
36 #define ARROW_NO_EXPORT
37 #else // Not Windows
38 #ifndef ARROW_EXPORT
39 #define ARROW_EXPORT __attribute__((visibility("default")))
40 #endif
41 #ifndef ARROW_NO_EXPORT
42 #define ARROW_NO_EXPORT __attribute__((visibility("hidden")))
43 #endif
44 #endif // Non-Windows
45 
46 // gcc and clang disagree about how to handle template visibility when you have
47 // explicit specializations https://llvm.org/bugs/show_bug.cgi?id=24815
48 
49 #if defined(__clang__)
50 #define ARROW_EXTERN_TEMPLATE extern template class ARROW_EXPORT
51 #else
52 #define ARROW_EXTERN_TEMPLATE extern template class
53 #endif
54 
55 // This is a complicated topic, some reading on it:
56 // http://www.codesynthesis.com/~boris/blog/2010/01/18/dll-export-cxx-templates/
57 #if defined(_MSC_VER) || defined(__clang__)
58 #define ARROW_TEMPLATE_EXPORT ARROW_EXPORT
59 #else
60 #define ARROW_TEMPLATE_EXPORT
61 #endif
62 
63 #endif // ARROW_UTIL_VISIBILITY_H