longdouble.m4 (1215B)
1 # longdouble.m4 serial 2 (gettext-0.15) 2 dnl Copyright (C) 2002-2003, 2006 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 dnl This file is only needed in autoconf <= 2.59. Newer versions of autoconf 12 dnl have a macro AC_TYPE_LONG_DOUBLE with identical semantics. 13 14 AC_DEFUN([gt_TYPE_LONGDOUBLE], 15 [ 16 AC_CACHE_CHECK([for long double], gt_cv_c_long_double, 17 [if test "$GCC" = yes; then 18 gt_cv_c_long_double=yes 19 else 20 AC_TRY_COMPILE([ 21 /* The Stardent Vistra knows sizeof(long double), but does not support it. */ 22 long double foo = 0.0; 23 /* On Ultrix 4.3 cc, long double is 4 and double is 8. */ 24 int array [2*(sizeof(long double) >= sizeof(double)) - 1]; 25 ], , 26 gt_cv_c_long_double=yes, gt_cv_c_long_double=no) 27 fi]) 28 if test $gt_cv_c_long_double = yes; then 29 AC_DEFINE(HAVE_LONG_DOUBLE, 1, [Define if you have the 'long double' type.]) 30 fi 31 ])