ce33a48efd
C89 doesn't have the `restrict` keyword. When in `-std=c89` mode, GNU-compatible compilers require the `__restrict` spelling.
82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
//===-- Common definitions for LLVM-libc public header files --------------===//
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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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#ifndef LLVM_LIBC_COMMON_H
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#define LLVM_LIBC_COMMON_H
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#ifdef __cplusplus
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#undef __BEGIN_C_DECLS
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#define __BEGIN_C_DECLS extern "C" {
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#undef __END_C_DECLS
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#define __END_C_DECLS }
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// Standard C++ doesn't have C99 restrict but GNU C++ has it with __ spelling.
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#undef __restrict
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#ifndef __GNUC__
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#define __restrict
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#endif
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#undef _Noreturn
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#define _Noreturn [[noreturn]]
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#undef _Alignas
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#define _Alignas alignas
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#undef _Static_assert
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#define _Static_assert static_assert
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#undef _Alignof
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#define _Alignof alignof
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#undef _Thread_local
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#define _Thread_local thread_local
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#undef __NOEXCEPT
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#define __NOEXCEPT noexcept
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#else // not __cplusplus
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#undef __BEGIN_C_DECLS
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#define __BEGIN_C_DECLS
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#undef __END_C_DECLS
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#define __END_C_DECLS
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#undef __restrict
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#if __STDC_VERSION__ >= 199901L
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// C99 and above support the restrict keyword.
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#define __restrict restrict
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#elif !defined(__GNUC__)
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// GNU-compatible compilers accept the __ spelling in all modes.
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// Otherwise, omit the qualifier for pure C89 compatibility.
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#define __restrict
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#endif
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#undef _Noreturn
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#if __STDC_VERSION__ >= 201112L
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// In C11 and later, _Noreturn is a keyword.
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#elif defined(__GNUC__)
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// GNU-compatible compilers have an equivalent attribute.
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#define _Noreturn __attribute__((__noreturn__))
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#else
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#define _Noreturn
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#endif
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#undef __NOEXCEPT
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#ifdef __GNUC__
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#define __NOEXCEPT __attribute__((__nothrow__))
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#else
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#define __NOEXCEPT
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#endif
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#endif // __cplusplus
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#endif // LLVM_LIBC_COMMON_H
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