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confuse 2.7

    1: # ulonglong.m4 serial 6
    2: dnl Copyright (C) 1999-2006 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 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: 
   18: AC_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 $ac_cv_type_unsigned_long_long_int = yes; then
   34:     AC_DEFINE([HAVE_UNSIGNED_LONG_LONG_INT], 1,
   35:       [Define to 1 if the system has the type `unsigned long long int'.])
   36:   fi
   37: ])
   38: 
   39: # This macro is obsolescent and should go away soon.
   40: AC_DEFUN([gl_AC_TYPE_UNSIGNED_LONG_LONG],
   41: [
   42:   AC_REQUIRE([AC_TYPE_UNSIGNED_LONG_LONG_INT])
   43:   ac_cv_type_unsigned_long_long=$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: ])