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Date: Fri, 31 Oct 2008 09:35:05 -0600
From: Eric Blake <ebb9 AT byu DOT net>
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To: cygwin AT cygwin DOT com
Subject: Re: cygwin g++ strictness
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According to Peter Rosin on 10/31/2008 9:19 AM:
> main(void)
> {
>     int32_t i = 32;
>     printf("%d", i);
>     return 0;
> }
> $ gcc -c -Wall int.c
> int.c: In function `main':
> int.c:6: warning: int format, int32_t arg (arg 2)
> int.c:6: warning: int format, int32_t arg (arg 2)
> 
> What should the format specifier be to not have that warning
> on neither Cygwin nor Linux? (or anywhere for that matter)

http://www.opengroup.org/onlinepubs/009695399/basedefs/inttypes.h.html#tag_13_20

#include <inttypes.h>

int32_t i;
printf("%"PRId32"\n",i);

> If the portable thing to do is casting all printf arguments,
> I'm not sure the remedy is worth the damage. But all those
> warnings are definitely an annoyance...

Those warnings are issued for a reason - int is not guaranteed to be 32
bits.  When using a 32-bit type, you should use the 32-bit type specifier
in printf (PRId32, PRIo32, PRIu32, PRIx32, PRIX32) rather than a the int
type specifier ("d", "o", "u", "x", "X").  Note that the PRI* macros are
string constants, and that C and C++ string concatenation rules are in use
here.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9 AT byu DOT net
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