source: binutils/vendor/current/config/bitfields.m4@ 1968

Last change on this file since 1968 was 1968, checked in by Silvan Scherrer, 8 years ago

binutils: update vendor to version 2.27. some files are missing, due to a svn bug with @ in the name. But as it's only in the testsuite I don't care atm

File size: 1.0 KB
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1dnl Copyright (C) 2015 Free Software Foundation, Inc.
2dnl This file is free software, distributed under the terms of the GNU
3dnl General Public License. As a special exception to the GNU General
4dnl Public License, this file may be distributed as part of a program
5dnl that contains a configuration script generated by Autoconf, under
6dnl 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
11AC_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; };
17struct foo2 { char x; long long int y:1; char z; };
18int 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])
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