46 lines
2.1 KiB
C
46 lines
2.1 KiB
C
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/* A C macro for declaring that a function does not return.
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Copyright (C) 2011-2023 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#ifndef _Noreturn
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# if (defined __cplusplus \
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&& ((201103 <= __cplusplus && !(__GNUC__ == 4 && __GNUC_MINOR__ == 7)) \
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|| (defined _MSC_VER && 1900 <= _MSC_VER)) \
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&& 0)
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/* [[noreturn]] is not practically usable, because with it the syntax
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extern _Noreturn void func (...);
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would not be valid; such a declaration would only be valid with 'extern'
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and '_Noreturn' swapped, or without the 'extern' keyword. However, some
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AIX system header files and several gnulib header files use precisely
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this syntax with 'extern'. */
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# define _Noreturn [[noreturn]]
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# elif ((!defined __cplusplus || defined __clang__) \
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&& (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) \
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|| (!defined __STRICT_ANSI__ \
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&& (4 < __GNUC__ + (7 <= __GNUC_MINOR__) \
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|| (defined __apple_build_version__ \
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? 6000000 <= __apple_build_version__ \
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: 3 < __clang_major__ + (5 <= __clang_minor__))))))
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/* _Noreturn works as-is. */
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# elif (2 < __GNUC__ + (8 <= __GNUC_MINOR__) || defined __clang__ \
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|| 0x5110 <= __SUNPRO_C)
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# define _Noreturn __attribute__ ((__noreturn__))
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# elif 1200 <= (defined _MSC_VER ? _MSC_VER : 0)
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# define _Noreturn __declspec (noreturn)
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# else
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# define _Noreturn
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# endif
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#endif
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