sys/stdatomic.h: be nicer to c++
Use of stdatomic.h is undefined in C++, even the C++ 2020 standard does not list stdatomic.h as a C library header supported by the language. More, there are some subtle differences between the <atomic> C++ header, and C11+ stdatomic.h provided features. Nonetheless, it is a quality of the implementation aspect, so let mis-users mis-use stdatomic.h as they want, by making a compat shim for _Bool. PR: 262683 Reported by: yuri Reviewed by: dim, emaste Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D34686
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@ -163,6 +163,11 @@ atomic_signal_fence(memory_order __order __unused)
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#endif
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}
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#if defined(__cplusplus) && !defined(_Bool)
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#define _Bool bool
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#define __bool_locally_defined
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#endif
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/*
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* 7.17.5 Lock-free property.
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*/
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@ -408,4 +413,9 @@ atomic_flag_clear(volatile atomic_flag *__object)
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}
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#endif /* !_KERNEL */
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#ifdef __bool_locally_defined
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#undef _Bool
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#undef __bool_locally_defined
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#endif
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#endif /* !_STDATOMIC_H_ */
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