1  /* A C macro for declaring that a function does not return.
       2     Copyright (C) 2011-2022 Free Software Foundation, Inc.
       3  
       4     This program is free software: you can redistribute it and/or modify it
       5     under the terms of the GNU Lesser General Public License as published
       6     by the Free Software Foundation; either version 2 of the License, or
       7     (at your option) any later version.
       8  
       9     This program is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public License
      15     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  #ifndef _Noreturn
      18  # if (defined __cplusplus \
      19        && ((201103 <= __cplusplus && !(__GNUC__ == 4 && __GNUC_MINOR__ == 7)) \
      20            || (defined _MSC_VER && 1900 <= _MSC_VER)) \
      21        && 0)
      22      /* [[noreturn]] is not practically usable, because with it the syntax
      23           extern _Noreturn void func (...);
      24         would not be valid; such a declaration would only be valid with 'extern'
      25         and '_Noreturn' swapped, or without the 'extern' keyword.  However, some
      26         AIX system header files and several gnulib header files use precisely
      27         this syntax with 'extern'.  */
      28  #  define _Noreturn [[noreturn]]
      29  # elif ((!defined __cplusplus || defined __clang__) \
      30          && (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) \
      31              || (!defined __STRICT_ANSI__ \
      32                  && (4 < __GNUC__ + (7 <= __GNUC_MINOR__) \
      33                      || (defined __apple_build_version__ \
      34                          ? 6000000 <= __apple_build_version__ \
      35                          : 3 < __clang_major__ + (5 <= __clang_minor__))))))
      36     /* _Noreturn works as-is.  */
      37  # elif (2 < __GNUC__ + (8 <= __GNUC_MINOR__) || defined __clang__ \
      38          || 0x5110 <= __SUNPRO_C)
      39  #  define _Noreturn __attribute__ ((__noreturn__))
      40  # elif 1200 <= (defined _MSC_VER ? _MSC_VER : 0)
      41  #  define _Noreturn __declspec (noreturn)
      42  # else
      43  #  define _Noreturn
      44  # endif
      45  #endif