1*16dce513Schristosdnl Copyright (C) 2015 Free Software Foundation, Inc. 2*16dce513Schristosdnl This file is free software, distributed under the terms of the GNU 3*16dce513Schristosdnl General Public License. As a special exception to the GNU General 4*16dce513Schristosdnl Public License, this file may be distributed as part of a program 5*16dce513Schristosdnl that contains a configuration script generated by Autoconf, under 6*16dce513Schristosdnl the same distribution terms as the rest of that program. 7*16dce513Schristos 8*16dce513Schristos# Define HAVE_BITFIELD_TYPE_MATTERS if the type of bitfields effects their 9*16dce513Schristos# alignment. 10*16dce513Schristos 11*16dce513SchristosAC_DEFUN([gt_BITFIELD_TYPE_MATTERS], 12*16dce513Schristos[ 13*16dce513Schristos AC_CACHE_CHECK([if the type of bitfields matters], gt_cv_bitfield_type_matters, 14*16dce513Schristos [ 15*16dce513Schristos AC_TRY_COMPILE( 16*16dce513Schristos [struct foo1 { char x; char y:1; char z; }; 17*16dce513Schristosstruct foo2 { char x; long long int y:1; char z; }; 18*16dce513Schristosint foo1test[ sizeof (struct foo1) < sizeof (struct foo2) ? 1 : -1 ]; ], 19*16dce513Schristos [], gt_cv_bitfield_type_matters=yes, gt_cv_bitfield_type_matters=no) 20*16dce513Schristos ]) 21*16dce513Schristos if test $gt_cv_bitfield_type_matters = yes; then 22*16dce513Schristos AC_DEFINE(HAVE_BITFIELD_TYPE_MATTERS, 1, 23*16dce513Schristos [Define if the type of bitfields effects alignment.]) 24*16dce513Schristos fi 25*16dce513Schristos]) 26