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/* A C macro for declaring that a function does not return.
Copyright (C) 2011-2025 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* The _Noreturn keyword of C11.
Do not use [[noreturn]], because with it the syntax
extern _Noreturn void func (...);
would not be valid; such a declaration would be valid only with 'extern'
and '_Noreturn' swapped, or without the 'extern' keyword. However, some
AIX system header files and several gnulib header files use precisely
this syntax with 'extern'. So even though C23 deprecates _Noreturn,
it is currently more portable to prefer it to [[noreturn]].
Also, do not try to work around LLVM bug 59792 (clang 15 or earlier).
This rare bug can be worked around by compiling with 'clang -D_Noreturn=',
though the workaround may generate many false-alarm warnings. */
#ifndef _Noreturn
# if ((!defined __cplusplus || defined __clang__) \
&& (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0)))
/* _Noreturn works as-is. */
# elif (2 < __GNUC__ + (8 <= __GNUC_MINOR__) || defined __clang__ \
|| 0x5110 <= __SUNPRO_C)
/* Prefer __attribute__ ((__noreturn__)) to plain _Noreturn even if the
latter works, as 'gcc -std=gnu99 -Wpedantic' warns about _Noreturn. */
# define _Noreturn __attribute__ ((__noreturn__))
# elif 1200 <= (defined _MSC_VER ? _MSC_VER : 0)
# define _Noreturn __declspec (noreturn)
# else
# define _Noreturn
# endif
#endif
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