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
])