lib/stdalign.in.h

   1 /* A substitute for ISO C11 <stdalign.h>.
   2
   3    Copyright 2011-2024 Free Software Foundation, Inc.
   4
   5    This file is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9
  10    This file is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 /* Written by Paul Eggert and Bruno Haible.  */
  19
  20 /* Define two obsolescent C11 macros, assuming alignas and alignof are
  21    either keywords or alignasof-defined macros.  */
  22
  23 #ifndef _@GUARD_PREFIX@_STDALIGN_H
  24
  25 #if __GNUC__ >= 3
  26 @PRAGMA_SYSTEM_HEADER@
  27 #endif
  28 @PRAGMA_COLUMNS@
  29
  30 /* We need to include the system's <stdalign.h> when it exists, because it might
  31    define 'alignof' as a macro when it's not a keyword or compiler built-in.  */
  32 #if @HAVE_STDALIGN_H@
  33 /* The include_next requires a split double-inclusion guard.  */
  34 # @INCLUDE_NEXT@ @NEXT_STDALIGN_H@
  35 #endif
  36
  37 #ifndef _@GUARD_PREFIX@_STDALIGN_H
  38 #define _@GUARD_PREFIX@_STDALIGN_H
  39
  40 #if (defined alignas \
  41      || (defined __STDC_VERSION__ && 202311 <= __STDC_VERSION__) \
  42      || (defined __cplusplus && (201103 <= __cplusplus || defined _MSC_VER)))
  43 # define __alignas_is_defined 1
  44 #endif
  45
  46 #define __alignof_is_defined 1
  47
  48 #endif /* _@GUARD_PREFIX@_STDALIGN_H */
  49 #endif /* _@GUARD_PREFIX@_STDALIGN_H */