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1# longdouble.m4 serial 2 (gettext-0.15)
2dnl Copyright (C) 2002-2003, 2006 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7dnl From Bruno Haible.
8dnl Test whether the compiler supports the 'long double' type.
9dnl Prerequisite: AC_PROG_CC
10
11dnl This file is only needed in autoconf <= 2.59. Newer versions of autoconf
12dnl have a macro AC_TYPE_LONG_DOUBLE with identical semantics.
13
14AC_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])