| 1 | /* A C macro for declaring that a function does not return.
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| 2 | Copyright (C) 2011-2021 Free Software Foundation, Inc.
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| 3 |
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| 4 | This program is free software: you can redistribute it and/or modify it
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| 5 | under the terms of the GNU Lesser General Public License as published
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| 6 | by the Free Software Foundation; either version 2 of the License, or
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| 7 | (at your option) any later version.
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| 8 |
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| 9 | This program is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 12 | Lesser General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU Lesser General Public License
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| 15 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 16 |
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| 17 | #ifndef _Noreturn
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| 18 | # if (defined __cplusplus \
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| 19 | && ((201103 <= __cplusplus && !(__GNUC__ == 4 && __GNUC_MINOR__ == 7)) \
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| 20 | || (defined _MSC_VER && 1900 <= _MSC_VER)) \
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| 21 | && 0)
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| 22 | /* [[noreturn]] is not practically usable, because with it the syntax
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| 23 | extern _Noreturn void func (...);
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| 24 | would not be valid; such a declaration would only be valid with 'extern'
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| 25 | and '_Noreturn' swapped, or without the 'extern' keyword. However, some
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| 26 | AIX system header files and several gnulib header files use precisely
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| 27 | this syntax with 'extern'. */
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| 28 | # define _Noreturn [[noreturn]]
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| 29 | # elif ((!defined __cplusplus || defined __clang__) \
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| 30 | && (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) \
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| 31 | || (!defined __STRICT_ANSI__ \
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| 32 | && (__4 < __GNUC__ + (7 <= __GNUC_MINOR__) \
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| 33 | || (defined __apple_build_version__ \
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| 34 | ? 6000000 <= __apple_build_version__ \
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| 35 | : 3 < __clang_major__ + (5 <= __clang_minor__))))))
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| 36 | /* _Noreturn works as-is. */
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| 37 | # elif (2 < __GNUC__ + (8 <= __GNUC_MINOR__) || defined __clang__ \
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| 38 | || 0x5110 <= __SUNPRO_C)
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| 39 | # define _Noreturn __attribute__ ((__noreturn__))
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| 40 | # elif 1200 <= (defined _MSC_VER ? _MSC_VER : 0)
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| 41 | # define _Noreturn __declspec (noreturn)
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| 42 | # else
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| 43 | # define _Noreturn
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| 44 | # endif
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| 45 | #endif
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