1 files changed, 38 insertions, 15 deletions

diff --git a/m4/ulonglong.m4 b/m4/ulonglong.m4
index 1da8b809..9fae98e3 100644
--- a/m4/ulonglong.m4
+++ b/m4/ulonglong.m4
@@ -1,23 +1,46 @@
-# ulonglong.m4 serial 3
-dnl Copyright (C) 1999-2003 Free Software Foundation, Inc.
-dnl This file is free software, distributed under the terms of the GNU
-dnl General Public License.  As a special exception to the GNU General
-dnl Public License, this file may be distributed as part of a program
-dnl that contains a configuration script generated by Autoconf, under
-dnl the same distribution terms as the rest of that program.
+# ulonglong.m4 serial 6
+dnl Copyright (C) 1999-2006 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 Paul Eggert.
 
-# Define HAVE_UNSIGNED_LONG_LONG if 'unsigned long long' works.
+# Define HAVE_UNSIGNED_LONG_LONG_INT if 'unsigned long long int' works.
+# This fixes a bug in Autoconf 2.60, but can be removed once we
+# assume 2.61 everywhere.
 
-AC_DEFUN([jm_AC_TYPE_UNSIGNED_LONG_LONG],
+# Note: If the type 'unsigned long long int' exists but is only 32 bits
+# large (as on some very old compilers), AC_TYPE_UNSIGNED_LONG_LONG_INT
+# will not be defined. In this case you can treat 'unsigned long long int'
+# like 'unsigned long int'.
+
+AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT],
+[
+  AC_CACHE_CHECK([for unsigned long long int],
+    [ac_cv_type_unsigned_long_long_int],
+    [AC_LINK_IFELSE(
+       [AC_LANG_PROGRAM(
+          [[unsigned long long int ull = 18446744073709551615ULL;
+            typedef int a[(18446744073709551615ULL <= (unsigned long long int) -1
+                           ? 1 : -1)];
+           int i = 63;]],
+          [[unsigned long long int ullmax = 18446744073709551615ull;
+            return (ull << 63 | ull >> 63 | ull << i | ull >> i
+                    | ullmax / ull | ullmax % ull);]])],
+       [ac_cv_type_unsigned_long_long_int=yes],
+       [ac_cv_type_unsigned_long_long_int=no])])
+  if test $ac_cv_type_unsigned_long_long_int = yes; then
+    AC_DEFINE([HAVE_UNSIGNED_LONG_LONG_INT], 1,
+      [Define to 1 if the system has the type `unsigned long long int'.])
+  fi
+])
+
+# This macro is obsolescent and should go away soon.
+AC_DEFUN([gl_AC_TYPE_UNSIGNED_LONG_LONG],
 [
-  AC_CACHE_CHECK([for unsigned long long], ac_cv_type_unsigned_long_long,
-  [AC_TRY_LINK([unsigned long long ull = 1ULL; int i = 63;],
-    [unsigned long long ullmax = (unsigned long long) -1;
-     return ull << i | ull >> i | ullmax / ull | ullmax % ull;],
-    ac_cv_type_unsigned_long_long=yes,
-    ac_cv_type_unsigned_long_long=no)])
+  AC_REQUIRE([AC_TYPE_UNSIGNED_LONG_LONG_INT])
+  ac_cv_type_unsigned_long_long=$ac_cv_type_unsigned_long_long_int
   if test $ac_cv_type_unsigned_long_long = yes; then
     AC_DEFINE(HAVE_UNSIGNED_LONG_LONG, 1,
       [Define if you have the 'unsigned long long' type.])