1 /* A C macro for declaring that a function does not return. 2 Copyright (C) 2011-2020 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 General Public License as published 6 by the Free Software Foundation; either version 3 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 General Public License for more details. 13 14 You should have received a copy of the GNU 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 || 4 < __GNUC__ + (7 <= __GNUC_MINOR__) \ 32 || (defined __apple_build_version__ \ 33 ? 6000000 <= __apple_build_version__ \ 34 : 3 < __clang_major__ + (5 <= __clang_minor__)))) 35 /* _Noreturn works as-is. */ 36 # elif 2 < __GNUC__ + (8 <= __GNUC_MINOR__) || 0x5110 <= __SUNPRO_C 37 # define _Noreturn __attribute__ ((__noreturn__)) 38 # elif 1200 <= (defined _MSC_VER ? _MSC_VER : 0) 39 # define _Noreturn __declspec (noreturn) 40 # else 41 # define _Noreturn 42 # endif 43 #endif 44