| dnl Copyright (C) 2015 Free Software Foundation, Inc. |
| dnl This file is free software, distributed under the terms of the GNU |
| dnl General Public License. As a special exception to the GNU General |
| dnl Public License, this file may be distributed as part of a program |
| dnl that contains a configuration script generated by Autoconf, under |
| dnl the same distribution terms as the rest of that program. |
| |
| # Define HAVE_BITFIELD_TYPE_MATTERS if the type of bitfields effects their |
| # alignment. |
| |
| AC_DEFUN([gt_BITFIELD_TYPE_MATTERS], |
| [ |
| AC_CACHE_CHECK([if the type of bitfields matters], gt_cv_bitfield_type_matters, |
| [ |
| AC_TRY_COMPILE( |
| [struct foo1 { char x; char y:1; char z; }; |
| struct foo2 { char x; long long int y:1; char z; }; |
| int foo1test[ sizeof (struct foo1) < sizeof (struct foo2) ? 1 : -1 ]; ], |
| [], gt_cv_bitfield_type_matters=yes, gt_cv_bitfield_type_matters=no) |
| ]) |
| if test $gt_cv_bitfield_type_matters = yes; then |
| AC_DEFINE(HAVE_BITFIELD_TYPE_MATTERS, 1, |
| [Define if the type of bitfields effects alignment.]) |
| fi |
| ]) |
