Re: [patch] Use inttypes macros for size_t format string

[g4-lisz@xxxxxxxxxxxx]

On 15.01.20 17:32, Andreas Schneider wrote:

> On Wednesday, 15 January 2020 14:35:39 CET Jakub Jelen wrote:
>> On Wed, 2020-01-15 at 13:01 +0100, g4-lisz@xxxxxxxxxxxx wrote:
>>> Hi there, here's a patch for fixing a printf format string issue when
>>> compiling with MinGW (and possibly other "architectures"...).
>>>
>>> A big thanks to Zdenek OGAR Skalak for the hint!
>> Looks good to me. Grepping through the rest of the code shows that
>> there will most probably be more issues like this:
>>
>> $ git grep "PRIdS" | wc -l
>> 10
>> $ git grep "%zu" | wc -l
>> 27
>>
>> Could you check also the other cases to make sure we can address it in
>> the whole codebase?
>>
>> Andreas, what do you suggest to make sure we do not introduce new
>> issues like this?
> %zu is ANSI C99
>
> https://en.cppreference.com/w/c/io/fprintf
>
> That's more than 20 years old now. We had PRIdS because Visual Studio didn't 
> have %zu support for a long time. So we should replace PRIdS with %zu ;-)
>
>
> Till, I'm sorry but you hit a compiler bug, open a bug against MinGW.

It's not really a compiler bug. See here:
https://stackoverflow.com/questions/44382862/how-to-printf-a-size-t-without-warning-in-mingw-w64-gcc-7-1

"The problem is not the compiler but the C library. MinGW uses
Microsoft's "Visual C Runtime" (msvcrt) which only conforms to c89 and
it doesn't support the z format specifier."

If this is still true, I see no other way than using PRIdS/PRIuS to
compile with MinGW ...

Cheers,
Till


>
>
> 	Andreas
>