65 lines
2.6 KiB
C++
65 lines
2.6 KiB
C++
//===-- clang/Support/Compiler.h - Compiler abstraction support -*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines explicit visibility macros used to export symbols from
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// clang-cpp
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//
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//===----------------------------------------------------------------------===//
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#ifndef CLANG_SUPPORT_COMPILER_H
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#define CLANG_SUPPORT_COMPILER_H
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#include "llvm/Support/Compiler.h"
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/// CLANG_ABI is the main export/visibility macro to mark something as
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/// explicitly exported when clang is built as a shared library with everything
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/// else that is unannotated having hidden visibility.
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///
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/// CLANG_EXPORT_TEMPLATE is used on explicit template instantiations in source
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/// files that were declared extern in a header. This macro is only set as a
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/// compiler export attribute on windows, on other platforms it does nothing.
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///
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/// CLANG_TEMPLATE_ABI is for annotating extern template declarations in headers
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/// for both functions and classes. On windows its turned in to dllimport for
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/// library consumers, for other platforms its a default visibility attribute.
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#ifndef CLANG_ABI_GENERATING_ANNOTATIONS
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// Marker to add to classes or functions in public headers that should not have
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// export macros added to them by the clang tool
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#define CLANG_ABI_NOT_EXPORTED
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// Some libraries like those for tablegen are linked in to tools that used
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// in the build so can't depend on the llvm shared library. If export macros
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// were left enabled when building these we would get duplicate or
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// missing symbol linker errors on windows.
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#if defined(CLANG_BUILD_STATIC)
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#define CLANG_ABI
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#define CLANG_TEMPLATE_ABI
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#define CLANG_EXPORT_TEMPLATE
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#elif defined(_WIN32) && !defined(__MINGW32__)
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#if defined(CLANG_EXPORTS)
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#define CLANG_ABI __declspec(dllexport)
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#define CLANG_TEMPLATE_ABI
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#define CLANG_EXPORT_TEMPLATE __declspec(dllexport)
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#else
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#define CLANG_ABI __declspec(dllimport)
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#define CLANG_TEMPLATE_ABI __declspec(dllimport)
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#define CLANG_EXPORT_TEMPLATE
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#endif
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#elif defined(__ELF__) || defined(__MINGW32__) || defined(_AIX) || \
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defined(__MVS__) || defined(__CYGWIN__)
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#define CLANG_ABI LLVM_ATTRIBUTE_VISIBILITY_DEFAULT
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#define CLANG_TEMPLATE_ABI LLVM_ATTRIBUTE_VISIBILITY_DEFAULT
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#define CLANG_EXPORT_TEMPLATE
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#elif defined(__MACH__) || defined(__WASM__) || defined(__EMSCRIPTEN__)
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#define CLANG_ABI LLVM_ATTRIBUTE_VISIBILITY_DEFAULT
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#define CLANG_TEMPLATE_ABI
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#define CLANG_EXPORT_TEMPLATE
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#endif
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#endif
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#endif
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