Re: `quad' printf format specifier ?

[Zack Weinberg <zack@rabi.columbia.edu>]

On Sat, 6 Feb 1999 13:31:20 +0100, Marc Espie wrote:
>On Fri, Feb 05, 1999 at 08:55:28PM -0500, Zack Weinberg wrote:
>> If sizeof (long long) == sizeof (long) on openbsd-alpha, it should work
>> anyway - i.e. %ld, %lld, and %qd should be interchangeable.  What problems
>> are you seeing?
>
>Warnings when using __attribute((format(printf,...))
>
>> (Note this is a libc issue, not a compiler issue, unless your problem is
>> with gcc's format checking.)
>
>Precisely...
>I probably wasn't clear enough in my message, wasn't I ?

It makes sense now.  I can make a case for fixing gcc or for changing
your definition of quad_t:

- %qd is defined to print a 64 bit quantity, so if long is 64 bits,
then we shouldn't warn when %qd is used to print something with base
type long.

- but long isn't 64 bits everywhere, so portable code must use int64_t
and/or long long to get 64 bits reliably; therefore %qd and %lld
should warn when given something with base type long.

It really boils down to whether you think `long long' is an
abomination or not.

zw