bitfields.m4 revision 1.1.1.1
1 1.1 mrg dnl Copyright (C) 2015 Free Software Foundation, Inc. 2 1.1 mrg dnl This file is free software, distributed under the terms of the GNU 3 1.1 mrg dnl General Public License. As a special exception to the GNU General 4 1.1 mrg dnl Public License, this file may be distributed as part of a program 5 1.1 mrg dnl that contains a configuration script generated by Autoconf, under 6 1.1 mrg dnl the same distribution terms as the rest of that program. 7 1.1 mrg 8 1.1 mrg # Define HAVE_BITFIELD_TYPE_MATTERS if the type of bitfields effects their 9 1.1 mrg # alignment. 10 1.1 mrg 11 1.1 mrg AC_DEFUN([gt_BITFIELD_TYPE_MATTERS], 12 1.1 mrg [ 13 1.1 mrg AC_CACHE_CHECK([if the type of bitfields matters], gt_cv_bitfield_type_matters, 14 1.1 mrg [ 15 1.1 mrg AC_TRY_COMPILE( 16 1.1 mrg [struct foo1 { char x; char y:1; char z; }; 17 1.1 mrg struct foo2 { char x; long long int y:1; char z; }; 18 1.1 mrg int foo1test[ sizeof (struct foo1) < sizeof (struct foo2) ? 1 : -1 ]; ], 19 1.1 mrg [], gt_cv_bitfield_type_matters=yes, gt_cv_bitfield_type_matters=no) 20 1.1 mrg ]) 21 1.1 mrg if test $gt_cv_bitfield_type_matters = yes; then 22 1.1 mrg AC_DEFINE(HAVE_BITFIELD_TYPE_MATTERS, 1, 23 1.1 mrg [Define if the type of bitfields effects alignment.]) 24 1.1 mrg fi 25 1.1 mrg ]) 26
Indexes created Mon Jun 29 00:24:49 UTC 2026