Re: 64 bit printf() format prefix compatibility problem

Hi Alan,

At 13.14 10/08/2003, Alan Barrett wrote:

>On Sun, 10 Aug 2003, Serassio Guido wrote:
> > gcc uses "ll" as 64 bit formatting prefix for printf, where MSVC uses
> "I64".
>
>In C++, as Robert said, using operator<< would be better.
>
>In standard C (C99), the way to handle this is to include <inttypes.h>
>to get definitions of PRId64 and friends. Then you do stuff like this:
>
> int64_t foo;
> printf("foo=%"PRId64"\n", foo);
>
>If your compiler or system library doesn't supply the PRIxxx macros that
>are supposed to be in <inttypes.h>, then you could define them somewhere
>conditional on the compiler or system.

This seems to me a very good approach.

FYI:

On MinGW inttypes.h is present and correctly defines all 64 bit formats
according to MS proprietary MSVCRT.
On MSVC is missing (as usual ...), but this is not a problem.
On Cygwin inttypes.h seems to be missing, and this is very strange.
On my Debian Woody it's present (of course ... ).

Robert: There is some related stuff in autoconf ?

Regards

Guido

-
========================================================
Guido Serassio
Acme Consulting S.r.l.
Via Gorizia, 69 10136 - Torino - ITALY
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Email: guido.serassio@acmeconsulting.it
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Received on Sun Aug 10 2003 - 06:02:28 MDT