1 /* 2 * This file and its contents are supplied under the terms of the 3 * Common Development and Distribution License ("CDDL"), version 1.0. 4 * You may only use this file in accordance with the terms of version 5 * 1.0 of the CDDL. 6 * 7 * A full copy of the text of the CDDL should have accompanied this 8 * source. A copy of the CDDL is also available via the Internet at 9 * http://www.illumos.org/license/CDDL. 10 */ 11 12 /* 13 * Copyright 2016 Joyent, Inc. 14 * Copyright 2023 Oxide Computer Company 15 */ 16 17 #ifndef _SYS_STDALIGN_H 18 #define _SYS_STDALIGN_H 19 20 /* 21 * ISO/IEC C11 stdalign.h. This header is meant to provide definitions for the 22 * alignas and alignof 'keywords' into the underlying compiler-understood value. 23 * In addition, there are two macros that are meant to define that this process 24 * has happened. C++11 added alignas/alignof as keywords and including this 25 * header is meant to cause us to still have the _is_defined macros, but not 26 * define this overall. 27 * 28 * Unlike other cases we don't use any symbol guards here (other than C++) and 29 * just allow the implementation to either have _Alignas and _Alignof or not 30 * have it and lead to a compiler error for the user. The main justification of 31 * this is that this header is only defined in C11 (and newer). It's not defined 32 * in other standards and just as if you include a non-standard header, in this 33 * case we don't try to stop that (same as if you included something like 34 * libdevinfo.h). 35 */ 36 37 #ifdef __cplusplus 38 extern "C" { 39 #endif 40 41 #ifndef __cplusplus 42 43 #define alignas _Alignas 44 /*CSTYLED*/ 45 #define alignof _Alignof 46 47 #endif /* !__cplusplus */ 48 49 #define __alignas_is_defined 1 50 #define __alignof_is_defined 1 51 52 #ifdef __cplusplus 53 } 54 #endif 55 56 #endif /* _SYS_STDALIGN_H */ 57