Re: pragma GCC diagnostic

[Jim Meyering]

"Manuel López-Ibáñez" <address@hidden> wrote:
> 2008/10/17 Bruno Haible <address@hidden>:
>> "#pragma GCC diagnostic" has a few limitations, which make it unusable to
>> resolve warnings like this one:
>>
>> Jim Meyering wrote in [1]:
>>>     $ cat in.c
>>>     int f (void) __attribute__ ((__warn_unused_result__));
>>>     void g (void) { (void) f (); }
>>>     $ gcc -Werror -c in.c
>>>     cc1: warnings being treated as errors
>>>     in.c: In function 'g':
>>>     in.c:2: error: ignoring return value of 'f', declared with attribute 
>>> warn_unused_result
...
> However, in this particular case, there is an easy workaround:
>
> int f (void) __attribute__ ((__warn_unused_result__));
> void g (void) { int i; i = f (); }
>
> This silences the warning and makes it obvious that you are doing
> something fishy.

Thanks, but I prefer to use the ignore_value function.
Adding a set-but-not-used variable might well provoke
a warning some day, if it doesn't already.