1 # longdouble.m4 serial 1 (gettext-0.12) 2 dnl Copyright (C) 2002-2003 Free Software Foundation, Inc. 3 dnl This file is free software, distributed under the terms of the GNU 4 dnl General Public License. As a special exception to the GNU General 5 dnl Public License, this file may be distributed as part of a program 6 dnl that contains a configuration script generated by Autoconf, under 7 dnl the same distribution terms as the rest of that program. 8 9 dnl From Bruno Haible. 10 dnl Test whether the compiler supports the 'long double' type. 11 dnl Prerequisite: AC_PROG_CC 12 13 AC_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
