libc/include/__llvm-libc-common.h

   1 //===-- Common definitions for LLVM-libc public header files --------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef LLVM_LIBC_COMMON_H
  10 #define LLVM_LIBC_COMMON_H
  11
  12 #ifdef __cplusplus
  13
  14 #undef __BEGIN_C_DECLS
  15 #define __BEGIN_C_DECLS extern "C" {
  16
  17 #undef __END_C_DECLS
  18 #define __END_C_DECLS }
  19
  20 // Standard C++ doesn't have C99 restrict but GNU C++ has it with __ spelling.
  21 #undef __restrict
  22 #ifndef __GNUC__
  23 #define __restrict
  24 #endif
  25
  26 #undef _Noreturn
  27 #define _Noreturn [[noreturn]]
  28
  29 #undef _Alignas
  30 #define _Alignas alignas
  31
  32 #undef _Static_assert
  33 #define _Static_assert static_assert
  34
  35 #undef _Alignof
  36 #define _Alignof alignof
  37
  38 #undef _Thread_local
  39 #define _Thread_local thread_local
  40
  41 #undef __NOEXCEPT
  42 #define __NOEXCEPT noexcept
  43
  44 #else // not __cplusplus
  45
  46 #undef __BEGIN_C_DECLS
  47 #define __BEGIN_C_DECLS
  48
  49 #undef __END_C_DECLS
  50 #define __END_C_DECLS
  51
  52 #undef __restrict
  53 #define __restrict restrict // C99 and above support the restrict keyword.
  54
  55 #undef __NOEXCEPT
  56 #define __NOEXCEPT
  57
  58 #endif // __cplusplus
  59
  60 #endif // LLVM_LIBC_COMMON_H