g++ veresion 3.3.2 on HP-UX IA 11.23 sets STDC_EXT

[Ryan Hadley <rhadley at interlinknetworks dot com>]

Hello,

I'm working on a HP-UX IA box:

$ uname -a
HP-UX t06 B.11.23 U ia64 2438279764 unlimited-user license

With gcc 3.3.2:

$ gcc --version
gcc (GCC) 3.3.2
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is 
NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR 
PURPOSE.

When I try to compile this file:

#include <net/if.h>

int main()
{
}

With gcc, everything works fine.  But if I use g++, not ok:

$ g++ -c test.c -o test 


In file included from test.c:1:
/usr/include/net/if.h:181: error: 'uint64_t' is used as a type, but is 
not defined as a type.

But, if I use g++ with "-U__STDC_EXT__" (or -mlp64, but I need -milp32 
to work), it works:

$ g++ -U__STDC_EXT__ -c test.c -o test 


<command line>:4:1: warning: undefining "__STDC_EXT__"
$

The problem seems to be with a line in net/if.h:

/* Note: The extended flags field "ifru_xflags" is a uint64_t which is not
 * a valid type for strict ANSI C compilation for ILP32. Applications that
 * need access to extended flags field should be compiled in extended ANSI
 * (-Ae) or LP64 mode.
 */

#if defined(__STDC_EXT__) || defined(__LP64__)

Is there a better way to do this than by undefining __STDC_EXT__?  Or is 
it be safe to undefine that?  I've tried searching google and these 
mailing lists with no luck...  Or should I be sending this question to HP?

Thanks-
Ryan