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43 lines
2.1 KiB
C
43 lines
2.1 KiB
C
/* A C macro for declaring that a function does not return.
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Copyright (C) 2011-2026 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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/* The _Noreturn keyword of C11.
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Do not use [[noreturn]], 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 be valid only 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'. So even though C23 deprecates _Noreturn,
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it is currently more portable to prefer it to [[noreturn]].
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Also, do not try to work around LLVM bug 59792 (clang 15 or earlier).
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This rare bug can be worked around by compiling with 'clang -D_Noreturn=',
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though the workaround may generate many false-alarm warnings. */
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#ifndef _Noreturn
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# if ((!defined __cplusplus || defined __clang__) \
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&& (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0)))
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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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/* Prefer __attribute__ ((__noreturn__)) to plain _Noreturn even if the
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latter works, as 'gcc -std=gnu99 -Wpedantic' warns about _Noreturn. */
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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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