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70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/*
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* attribute - control use of attributes in a backward compatible way
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*
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* Copyright (C) 2022 Landon Curt Noll
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*
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* Calc is open software; you can redistribute it and/or modify it under
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* the terms of the version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* Calc is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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* Public License for more details.
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*
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* A copy of version 2.1 of the GNU Lesser General Public License is
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* distributed with calc under the filename COPYING-LGPL. You should have
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* received a copy with calc; if not, write to Free Software Foundation, Inc.
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Under source code control: 2022/01/21 22:51:25
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* File existed as early as: 2022
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*
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* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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*/
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#if !defined(INCLUDE_ATTRIBUTE_H)
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#define INCLUDE_ATTRIBUTE_H
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/*
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* backward compatibility
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*
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* Not all compilers support __attribute__ nor do they suuport __has_builtin.
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* For example, MSVC, TenDRAm and Little C Compiler doesn't support __attribute__.
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* Early gcc does not support __attribute__.
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*
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* Not all compiles have __has_builtin
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*/
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#if !defined(__attribute__) && \
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(defined(__cplusplus) || !defined(__GNUC__) || __GNUC__ == 2 && __GNUC_MINOR__ < 8)
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# define __attribute__(A)
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#endif
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#if !defined __has_builtin
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# define __has_builtin(x) 0
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#endif
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/*
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* not_reached
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*
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* In the old days of lint, one could give lint and friends a hint by
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* placing the token NOTREACHED immediately between opening and closing
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* comments. Modern compilers do not honor such commented tokens
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* and instead rely on features such as __builtin_unreachable
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* and __attribute__((noreturn)).
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*
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* The not_reached will either yield a __builtin_unreachable() feature call,
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* or it will call abort from stdlib.
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*/
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#if __has_builtin(__builtin_unreachable)
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# define not_reached() __builtin_unreachable()
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#else
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# define not_reached() abort()
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#endif /* __has_builtin(__builtin_unreachable) */
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#endif /* !INCLUDE_ATTRIBUTE_H */
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