blob: 25590f4704d6a1905e47deef9bda479349d8b625 [file] [log] [blame]
# 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_CACHE_CHECK([for long double], gt_cv_c_long_double,
[if test "$GCC" = yes; then
/* 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)
if test $gt_cv_c_long_double = yes; then
AC_DEFINE(HAVE_LONG_DOUBLE, 1, [Define if you have the 'long double' type.])