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[Bug libc/5747] C99: Incorrect PRIu8 and PRIu16 in GNU <inttypes.h>
- From: "ebb9 at byu dot net" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: 15 Feb 2008 20:07:07 -0000
- Subject: [Bug libc/5747] C99: Incorrect PRIu8 and PRIu16 in GNU <inttypes.h>
- References: <20080207202744.5747.jeff.sullivan@intel.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From ebb9 at byu dot net 2008-02-15 20:07 -------
The compiler is technically right in warning, but the 'solution' proposed by the
OP is not correct.
When passed through ..., unsigned char promotes to 'int', not 'unsigned int'.
Likewise for unsigned short, when int is larger than short. If it were to
matter whether va_arg were handed 'int' vs. 'unsigned int', then PRIu8 and
PRIu16 should technically be "d" rather than "u" to match the type of the
argument promotion being used. But for all practical implementations, 'int' and
'unsigned int' are the same width (or put another way, calling printf("%u",int)
works just fine on the platforms that glibc target).
In short, I agree with Ulrich's decision to not change the current code base.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=5747
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