1# longdouble.m4 serial 1 (gettext-0.12)
2dnl Copyright (C) 2002-2003 Free Software Foundation, Inc.
3dnl This file is free software, distributed under the terms of the GNU
4dnl General Public License.  As a special exception to the GNU General
5dnl Public License, this file may be distributed as part of a program
6dnl that contains a configuration script generated by Autoconf, under
7dnl the same distribution terms as the rest of that program.
8
9dnl From Bruno Haible.
10dnl Test whether the compiler supports the 'long double' type.
11dnl Prerequisite: AC_PROG_CC
12
13AC_DEFUN([gt_TYPE_LONGDOUBLE],
14[
15  AC_CACHE_CHECK([for long double], gt_cv_c_long_double,
16    [if test "$GCC" = yes; then
17       gt_cv_c_long_double=yes
18     else
19       AC_TRY_COMPILE([
20         /* The Stardent Vistra knows sizeof(long double), but does not support it.  */
21         long double foo = 0.0;
22         /* On Ultrix 4.3 cc, long double is 4 and double is 8.  */
23         int array [2*(sizeof(long double) >= sizeof(double)) - 1];
24         ], ,
25         gt_cv_c_long_double=yes, gt_cv_c_long_double=no)
26     fi])
27  if test $gt_cv_c_long_double = yes; then
28    AC_DEFINE(HAVE_LONG_DOUBLE, 1, [Define if you have the 'long double' type.])
29  fi
30])
31