Re: inconsistent printf() warning printing size_t

[Joel Sherrill <joel dot sherrill at oarcorp dot com>]

Thanks. I am trying to whittle down the remaining warnings
in the RTEMS source base and now are down to the ones
folks (including myself) have ignored because they are
only showing up on a subset of targets.

Hopefully this will explain more of the printf() format
warnings.

--joel

On 3/13/2015 1:20 PM, Craig Howland wrote:
> On 03/13/2015 02:12 PM, Joel Sherrill wrote:
>> Hi
>>
>> This code gives a warning on some targets and not on others.
>> Specifically, it gives a warning where size_t is long unsigned int
>> but not unsigned int. If you use %ld, it inverts when the warning
>> occurs. Any suggestions on how to portably print a size_t and
>> not get a warning?
>>
>> ==============
>> #include <stdio.h>
>>
>> void f( size_t x)
>> {
>>    printf( "%d\n", x );
> printf("%zd\n", x);
> The 'z' length modifier means the conversion specifier applies to a size_t.
>> }
>> ===============
>>
>> This script is used to do the analysis:
>>
>> ===================
>> for t in arm-rtems4.11 avr-rtems4.11 bfin-rtems4.11 h8300-rtems4.11 \
>>    i386-rtems4.11 lm32-rtems4.11 m32c-rtems4.11 m32r-rtems4.11 \
>>    m68k-rtems4.11 mips-rtems4.11 nios2-rtems4.11 \
>>    powerpc-rtems4.11 sh-rtems4.11 sparc64-rtems4.11 sparc-rtems4.11 \
>>    v850-rtems4.11
>> do
>>    echo === ${t}
>>    ${t}-gcc -dM -E - </dev/null | grep UINTPTR_TYPE
>>    ${t}-gcc -Wall -Wextra -c f.c
>> done
>> ===================
>>

-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel.sherrill@OARcorp.com        On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
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