1 dnl Copyright (C) 2015 Free Software Foundation, Inc. 2 dnl This file is free software, distributed under the terms of the GNU 3 dnl General Public License. As a special exception to the GNU General 4 dnl Public License, this file may be distributed as part of a program 5 dnl that contains a configuration script generated by Autoconf, under 6 dnl the same distribution terms as the rest of that program. 7 8 # Define HAVE_BITFIELD_TYPE_MATTERS if the type of bitfields effects their 9 # alignment. 10 11 AC_DEFUN([gt_BITFIELD_TYPE_MATTERS], 12 [ 13 AC_CACHE_CHECK([if the type of bitfields matters], gt_cv_bitfield_type_matters, 14 [ 15 AC_TRY_COMPILE( 16 [struct foo1 { char x; char y:1; char z; }; 17 struct foo2 { char x; long long int y:1; char z; }; 18 int foo1test[ sizeof (struct foo1) < sizeof (struct foo2) ? 1 : -1 ]; ], 19 [], gt_cv_bitfield_type_matters=yes, gt_cv_bitfield_type_matters=no) 20 ]) 21 if test $gt_cv_bitfield_type_matters = yes; then 22 AC_DEFINE(HAVE_BITFIELD_TYPE_MATTERS, 1, 23 [Define if the type of bitfields effects alignment.]) 24 fi 25 ]) 26
Indexes created Fri Jun 19 00:25:02 UTC 2026