# 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_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.

# 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_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.])

  fi

])