| # longdouble.m4 serial 2 (gettext-0.15) |
| dnl Copyright (C) 2002-2003, 2006 Free Software Foundation, Inc. |
| dnl This file is free software; the Free Software Foundation |
| dnl gives unlimited permission to copy and/or distribute it, |
| dnl with or without modifications, as long as this notice is preserved. |
| |
| dnl From Bruno Haible. |
| dnl Test whether the compiler supports the 'long double' type. |
| dnl Prerequisite: AC_PROG_CC |
| |
| dnl This file is only needed in autoconf <= 2.59. Newer versions of autoconf |
| dnl have a macro AC_TYPE_LONG_DOUBLE with identical semantics. |
| |
| AC_DEFUN([gt_TYPE_LONGDOUBLE], |
| [ |
| AC_CACHE_CHECK([for long double], gt_cv_c_long_double, |
| [if test "$GCC" = yes; then |
| gt_cv_c_long_double=yes |
| else |
| AC_TRY_COMPILE([ |
| /* The Stardent Vistra knows sizeof(long double), but does not support it. */ |
| long double foo = 0.0; |
| /* On Ultrix 4.3 cc, long double is 4 and double is 8. */ |
| int array [2*(sizeof(long double) >= sizeof(double)) - 1]; |
| ], , |
| gt_cv_c_long_double=yes, gt_cv_c_long_double=no) |
| fi]) |
| if test $gt_cv_c_long_double = yes; then |
| AC_DEFINE(HAVE_LONG_DOUBLE, 1, [Define if you have the 'long double' type.]) |
| fi |
| ]) |
