Request for suppressing "warn_unused_result" warnings

["Lavrentiev, Anton (NIH/NLM/NCBI) [C]" <lavr at ncbi dot nlm dot nih dot gov>]

Dear GCC developers,

Would you please consider suppressing (relatively new) warnings like this one:

ignoring return value of 'int chdir(const char*)', declared with attribute warn_unused_result

in cases when the source code explicitly casts the result to (void).  Like in

(void) chdir("/");

There is no check necessary in this rare case, yet the compiler seems to ignore the
explicit cast (which tells the developer's intention exactly: there is nothing to check),
and keeps issuing the warning, regardless.

Making dummy assignment and/or check around such a chdir call (just to satisfy the
"unused result" requirement) will not help make the code any cleaner.

There are always a subtle number of cases for almost any "__wur" call that do not
need any result consumption.  Yet the warning in general is very helpful in
catching the situation where the result is not consumed *explicitly*.

We're lagging behind the GCC development here and perhaps the newest version of the
compiler does already implement this suggestion -- so let me apologize for the noise then.

Thanks for considering this suggestion,

Anton Lavrentiev
Contractor NIH/NLM/NCBI