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confuse 2.7

    1: # longlong.m4 serial 8
    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_LONG_LONG_INT if '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 'long long int' exists but is only 32 bits large
   14: # (as on some very old compilers), AC_TYPE_LONG_LONG_INT will not be
   15: # defined. In this case you can treat 'long long int' like 'long int'.
   16: 
   17: AC_DEFUN([AC_TYPE_LONG_LONG_INT],
   18: [
   19:   AC_CACHE_CHECK([for long long int], [ac_cv_type_long_long_int],
   20:     [AC_LINK_IFELSE(
   21:        [AC_LANG_PROGRAM(
   22: 	  [[long long int ll = 9223372036854775807ll;
   23: 	    long long int nll = -9223372036854775807LL;
   24: 	    typedef int a[((-9223372036854775807LL < 0
   25: 			    && 0 < 9223372036854775807ll)
   26: 			   ? 1 : -1)];
   27: 	    int i = 63;]],
   28: 	  [[long long int llmax = 9223372036854775807ll;
   29: 	    return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i)
   30: 		    | (llmax / ll) | (llmax % ll));]])],
   31:        [ac_cv_type_long_long_int=yes],
   32:        [ac_cv_type_long_long_int=no])])
   33:   if test $ac_cv_type_long_long_int = yes; then
   34:     AC_DEFINE([HAVE_LONG_LONG_INT], 1,
   35:       [Define to 1 if the system has the type `long long int'.])
   36:   fi
   37: ])
   38: 
   39: # This macro is obsolescent and should go away soon.
   40: AC_DEFUN([gl_AC_TYPE_LONG_LONG],
   41: [
   42:   AC_REQUIRE([AC_TYPE_LONG_LONG_INT])
   43:   ac_cv_type_long_long=$ac_cv_type_long_long_int
   44:   if test $ac_cv_type_long_long = yes; then
   45:     AC_DEFINE(HAVE_LONG_LONG, 1,
   46:       [Define if you have the 'long long' type.])
   47:   fi
   48: ])