root/maint/gnulib/lib/_Noreturn.h

/* */

   1 /* A C macro for declaring that a function does not return.
   2    Copyright (C) 2011-2021 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

/* */