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; the Free Software Foundation 4 dnl gives unlimited permission to copy and/or distribute it, 5 dnl with or without modifications, as long as this notice is preserved. 6 7 dnl From Bruno Haible. 8 dnl Test whether the compiler supports the 'long double' type. 9 dnl Prerequisite: AC_PROG_CC 10 11 AC_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
