1# ulonglong.m4 serial 6
2dnl Copyright (C) 1999-2006 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 Paul Eggert.
8
9# Define HAVE_UNSIGNED_LONG_LONG_INT if 'unsigned long long int' works.
10# This fixes a bug in Autoconf 2.60, but can be removed once we
11# assume 2.61 everywhere.
12
13# Note: If the type 'unsigned long long int' exists but is only 32 bits
14# large (as on some very old compilers), AC_TYPE_UNSIGNED_LONG_LONG_INT
15# will not be defined. In this case you can treat 'unsigned long long int'
16# like 'unsigned long int'.
17
18AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT],
19[
20  AC_CACHE_CHECK([for unsigned long long int],
21    [ac_cv_type_unsigned_long_long_int],
22    [AC_LINK_IFELSE(
23       [AC_LANG_PROGRAM(
24	  [[unsigned long long int ull = 18446744073709551615ULL;
25	    typedef int a[(18446744073709551615ULL <= (unsigned long long int) -1
26			   ? 1 : -1)];
27	   int i = 63;]],
28	  [[unsigned long long int ullmax = 18446744073709551615ull;
29	    return (ull << 63 | ull >> 63 | ull << i | ull >> i
30		    | ullmax / ull | ullmax % ull);]])],
31       [ac_cv_type_unsigned_long_long_int=yes],
32       [ac_cv_type_unsigned_long_long_int=no])])
33  if test $ac_cv_type_unsigned_long_long_int = yes; then
34    AC_DEFINE([HAVE_UNSIGNED_LONG_LONG_INT], 1,
35      [Define to 1 if the system has the type `unsigned long long int'.])
36  fi
37])
38
39# This macro is obsolescent and should go away soon.
40AC_DEFUN([gl_AC_TYPE_UNSIGNED_LONG_LONG],
41[
42  AC_REQUIRE([AC_TYPE_UNSIGNED_LONG_LONG_INT])
43  ac_cv_type_unsigned_long_long=$ac_cv_type_unsigned_long_long_int
44  if test $ac_cv_type_unsigned_long_long = yes; then
45    AC_DEFINE(HAVE_UNSIGNED_LONG_LONG, 1,
46      [Define if you have the 'unsigned long long' type.])
47  fi
48])
49