| Adam Tkac | fc4cd71 | 2009-03-11 11:14:37 +0000 | [diff] [blame] | 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 | ]) |