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[Clang] Add explicit visibility symbol macros (#108276)
This is part of the effort to support for enabling plugins on windows by adding better support for building llvm and clang as a DLL. These macros are similar to the ones i added in #96630, but are for clang. Added explicit symbol visibility macros definitions that are defined in a new header and will be used to for shared library builds of clang to export symbols. Updated clang cmake to define a macro to enable the symbol visibility macros and explicitly disable them for clang tools that always use static linking. --------- Co-authored-by: Aaron Ballman <[email protected]>
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//===-- clang/Support/Compiler.h - Compiler abstraction support -*- C++ -*-===// | ||
// | ||
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | ||
// See https://llvm.org/LICENSE.txt for license information. | ||
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||
// | ||
//===----------------------------------------------------------------------===// | ||
// | ||
// This file defines explicit visibility macros used to export symbols from | ||
// clang-cpp | ||
// | ||
//===----------------------------------------------------------------------===// | ||
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#ifndef CLANG_SUPPORT_COMPILER_H | ||
#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 | ||
/// explicitly exported when clang is built as a shared library with everything | ||
/// else that is unannotated having hidden visibility. | ||
/// | ||
/// CLANG_EXPORT_TEMPLATE is used on explicit template instantiations in source | ||
/// files that were declared extern in a header. This macro is only set as a | ||
/// compiler export attribute on windows, on other platforms it does nothing. | ||
/// | ||
/// CLANG_TEMPLATE_ABI is for annotating extern template declarations in headers | ||
/// for both functions and classes. On windows its turned in to dllimport for | ||
/// library consumers, for other platforms its a default visibility attribute. | ||
#ifndef CLANG_ABI_GENERATING_ANNOTATIONS | ||
// Marker to add to classes or functions in public headers that should not have | ||
// export macros added to them by the clang tool | ||
#define CLANG_ABI_NOT_EXPORTED | ||
// Some libraries like those for tablegen are linked in to tools that used | ||
// in the build so can't depend on the llvm shared library. If export macros | ||
// were left enabled when building these we would get duplicate or | ||
// missing symbol linker errors on windows. | ||
#if defined(CLANG_BUILD_STATIC) | ||
#define CLANG_ABI | ||
#define CLANG_TEMPLATE_ABI | ||
#define CLANG_EXPORT_TEMPLATE | ||
#elif defined(_WIN32) && !defined(__MINGW32__) | ||
#if defined(CLANG_EXPORTS) | ||
#define CLANG_ABI __declspec(dllexport) | ||
#define CLANG_TEMPLATE_ABI | ||
#define CLANG_EXPORT_TEMPLATE __declspec(dllexport) | ||
#else | ||
#define CLANG_ABI __declspec(dllimport) | ||
#define CLANG_TEMPLATE_ABI __declspec(dllimport) | ||
#define CLANG_EXPORT_TEMPLATE | ||
#endif | ||
#elif defined(__ELF__) || defined(__MINGW32__) || defined(_AIX) | ||
#define CLANG_ABI LLVM_ATTRIBUTE_VISIBILITY_DEFAULT | ||
#define CLANG_TEMPLATE_ABI LLVM_ATTRIBUTE_VISIBILITY_DEFAULT | ||
#define CLANG_EXPORT_TEMPLATE | ||
#elif defined(__MACH__) || defined(__WASM__) | ||
#define CLANG_ABI LLVM_ATTRIBUTE_VISIBILITY_DEFAULT | ||
#define CLANG_TEMPLATE_ABI | ||
#define CLANG_EXPORT_TEMPLATE | ||
#endif | ||
#endif | ||
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#endif |
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