Inconsistent printf format warnings for macro in system headers

Olivier Blin olivier.blin@softathome.com
Thu Oct 22 17:15:00 GMT 2015


Le 21/10/2015 19:34, Martin Sebor a écrit :
> On 10/16/2015 08:40 AM, Olivier Blin wrote:
>> Hello,
>>
>> In gcc versions starting from 4.8, it seems that printf format warnings
>> in macros are inconsistent, depending on whether the header defining the
>> macro is included as a system header or not, and on the build mode (C or
>> C++).
>>
>> With gcc < 4.8 (tried gcc 4.6.3 and 4.7.2), there are printf format
>> warnings for both C and C++ languages, when the macro is in a system
>> header or not.
>>
>> With gcc >= 4.8 (tried 4.8.2 and 5.2.1 snapshot), there are no printf
>> format warnings when the build mode is C++ *and* when the macro is in a
>> system header.
>> If the build mode is C or if the macro is in a non-system header, the
>> printf format warnings are emitted.
>
> I'm inclined to say it's a bug. I recommend opening it in Bugzilla.
Hello Martin,

Thanks for your answser and details.
I have opened a bug in bugzilla:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68052

It would probably be useful to add your comments in there.

Cheers

-- 
Olivier Blin - SoftAtHome



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