1: # longdouble.m4 serial 2 (gettext-0.15)
2: dnl Copyright (C) 2002-2003, 2006 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: dnl This file is only needed in autoconf <= 2.59. Newer versions of autoconf
12: dnl have a macro AC_TYPE_LONG_DOUBLE with identical semantics.
13:
14: AC_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: ])
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