Use __STDC_VERSION__ instead of __ISO_C_VISIBLE to guard _Static_assert.
We need to test what the compiler supports, not what the C library provides. This prevents static_assert from being defined when compiling with the in-tree gcc (4.2.1) which does not support _Static_assert.
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/* $OpenBSD: assert.h,v 1.14 2020/09/05 10:41:31 bentley Exp $ */
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/* $OpenBSD: assert.h,v 1.15 2020/09/06 12:57:25 millert Exp $ */
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/* $NetBSD: assert.h,v 1.6 1994/10/26 00:55:44 cgd Exp $ */
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/*-
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#ifndef _ASSERT_H_
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#define _ASSERT_H_
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#if __ISO_C_VISIBLE >= 2011 && !defined(__cplusplus)
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#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112
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#define static_assert _Static_assert
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#endif
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