| 1 | //===-- clang/Support/Compiler.h - Compiler abstraction support -*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file defines explicit visibility macros used to export symbols from |
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| 10 | // clang-cpp |
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| 11 | // |
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| 12 | //===----------------------------------------------------------------------===// |
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| 13 | |
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| 14 | #ifndef CLANG_SUPPORT_COMPILER_H |
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| 15 | #define CLANG_SUPPORT_COMPILER_H |
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| 16 | |
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| 17 | #include "llvm/Support/Compiler.h" |
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| 18 | |
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| 19 | /// CLANG_ABI is the main export/visibility macro to mark something as |
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| 20 | /// explicitly exported when clang is built as a shared library with everything |
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| 21 | /// else that is unannotated having hidden visibility. |
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| 22 | /// |
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| 23 | /// CLANG_EXPORT_TEMPLATE is used on explicit template instantiations in source |
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| 24 | /// files that were declared extern in a header. This macro is only set as a |
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| 25 | /// compiler export attribute on windows, on other platforms it does nothing. |
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| 26 | /// |
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| 27 | /// CLANG_TEMPLATE_ABI is for annotating extern template declarations in headers |
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| 28 | /// for both functions and classes. On windows its turned in to dllimport for |
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| 29 | /// library consumers, for other platforms its a default visibility attribute. |
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| 30 | #ifndef CLANG_ABI_GENERATING_ANNOTATIONS |
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| 31 | // Marker to add to classes or functions in public headers that should not have |
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| 32 | // export macros added to them by the clang tool |
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| 33 | #define CLANG_ABI_NOT_EXPORTED |
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| 34 | // Some libraries like those for tablegen are linked in to tools that used |
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| 35 | // in the build so can't depend on the llvm shared library. If export macros |
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| 36 | // were left enabled when building these we would get duplicate or |
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| 37 | // missing symbol linker errors on windows. |
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| 38 | #if defined(CLANG_BUILD_STATIC) |
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| 39 | #define CLANG_ABI |
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| 40 | #define CLANG_TEMPLATE_ABI |
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| 41 | #define CLANG_EXPORT_TEMPLATE |
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| 42 | #elif defined(_WIN32) && !defined(__MINGW32__) |
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| 43 | #if defined(CLANG_EXPORTS) |
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| 44 | #define CLANG_ABI __declspec(dllexport) |
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| 45 | #define CLANG_TEMPLATE_ABI |
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| 46 | #define CLANG_EXPORT_TEMPLATE __declspec(dllexport) |
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| 47 | #else |
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| 48 | #define CLANG_ABI __declspec(dllimport) |
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| 49 | #define CLANG_TEMPLATE_ABI __declspec(dllimport) |
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| 50 | #define CLANG_EXPORT_TEMPLATE |
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| 51 | #endif |
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| 52 | #elif defined(__ELF__) || defined(__MINGW32__) || defined(_AIX) || \ |
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| 53 | defined(__MVS__) || defined(__CYGWIN__) |
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| 54 | #define CLANG_ABI LLVM_ATTRIBUTE_VISIBILITY_DEFAULT |
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| 55 | #define CLANG_TEMPLATE_ABI LLVM_ATTRIBUTE_VISIBILITY_DEFAULT |
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| 56 | #define CLANG_EXPORT_TEMPLATE |
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| 57 | #elif defined(__MACH__) || defined(__WASM__) || defined(__EMSCRIPTEN__) |
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| 58 | #define CLANG_ABI LLVM_ATTRIBUTE_VISIBILITY_DEFAULT |
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| 59 | #define CLANG_TEMPLATE_ABI |
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| 60 | #define CLANG_EXPORT_TEMPLATE |
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| 61 | #endif |
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| 62 | #endif |
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| 63 | |
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| 64 | #endif |
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| 65 | |
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