--- old/usr/src/uts/common/sys/stdalign.h
          +++ new/usr/src/uts/common/sys/stdalign.h

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

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