emacs/lib/_Noreturn.h

/* A C macro for declaring that a function does not return.
   Copyright (C) 2011-2019 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published
   by the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

#ifndef _Noreturn
# if (defined __cplusplus \
      && ((201103 <= __cplusplus && !(__GNUC__ == 4 && __GNUC_MINOR__ == 7)) \
          || (defined _MSC_VER && 1900 <= _MSC_VER)))
#  define _Noreturn [[noreturn]]
# elif ((!defined __cplusplus || defined __clang__)                     \
        && (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0)  \
            || 4 < __GNUC__ + (7 <= __GNUC_MINOR__)))
   /* _Noreturn works as-is.  */
# elif 2 < __GNUC__ + (8 <= __GNUC_MINOR__) || 0x5110 <= __SUNPRO_C
#  define _Noreturn __attribute__ ((__noreturn__))
# elif 1200 <= (defined _MSC_VER ? _MSC_VER : 0)
#  define _Noreturn __declspec (noreturn)
# else
#  define _Noreturn
# endif
#endif