1# longdouble.m4 serial 1 (gettext-0.12)
2dnl Copyright (C) 2002-2003 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7dnl From Bruno Haible.
8dnl Test whether the compiler supports the 'long double' type.
9dnl Prerequisite: AC_PROG_CC
10
11AC_DEFUN([gt_TYPE_LONGDOUBLE],
12[
13  AC_CACHE_CHECK([for long double], gt_cv_c_long_double,
14    [if test "$GCC" = yes; then
15       gt_cv_c_long_double=yes
16     else
17       AC_TRY_COMPILE([
18         /* The Stardent Vistra knows sizeof(long double), but does not support it.  */
19         long double foo = 0.0;
20         /* On Ultrix 4.3 cc, long double is 4 and double is 8.  */
21         int array [2*(sizeof(long double) >= sizeof(double)) - 1];
22         ], ,
23         gt_cv_c_long_double=yes, gt_cv_c_long_double=no)
24     fi])
25  if test $gt_cv_c_long_double = yes; then
26    AC_DEFINE(HAVE_LONG_DOUBLE, 1, [Define if you have the 'long double' type.])
27  fi
28])
29