Re: linux libio status

[Peter Seebach <seebs@monolith.solon.com>]

In message < 19971015095211.03621@renaissance.loria.fr >, Olivier Galibert writes
:
>On Tue, Oct 14, 1997 at 11:23:49PM -0700, Joe Buck wrote:
>> We need to silence these warnings.  For the NULL, I suggest a global
>> s/NULL/0/ in the C++ iostreams headers.  There is no reason to write
>> NULL, it is just a source of problems like this (*especially* since
>> we have changed C++ to be strict about void*).

>Don't use '0' but '0L'. This way you will be OK with NULL in stdargs
>when int=32b and pointer=64b.

Assuming, of course, that 0L is 64 bits.  Rumor has it that some
implementations chose to make int and long 32, pointer 64, and
(cough) "long long" 64.

Further, what of an implementation where long is *larger* than a
pointer, but int is the same size?  Then you need 0, not 0L...

The only correct way to pass null pointers to stdarg functions
is with a cast to the type of pointer the function will be looking
for.  Probably a misfeature, but history doesn't always favor
elegance.

It would have been a little easier if C89 had ruled that NULL must
actually have pointer type, then you could just use it for anything
that would be taking arguments as (void *), and, if you're feeling
courageous and not-quite-perfectly-portable, you could just use it
for all the pointers...

-s