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