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