[Bug c/66425] (void) cast doesn't suppress __attribute__((warn_unused_result))

["romato.san1337 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66425

--- Comment #57 from Roman Krotov <romato.san1337 at gmail dot com> ---
(In reply to Ed Catmur from comment #55)
> So this problem will resolve itself, over time.

But I don't see any reasons not to implement the switch right now...
Late is better than never.

> we can expect that attribute to be adopted where people intend that behavior
> as opposed to the
> warning not suppressible by cast to void

I see your point and I partially agree with it, but what about the projects
what don't agree with the distinction of these 2 attributes? Or just want to be
more compatible with clang?
Or they just may not agree with the choice of a library, that decided to put
wur instead of nodiscard for a specific function.
Something like -Wno-void-unused would still be better for them than
-Wno-unused-result, for the reasons in my previous comment.

(In reply to Martin Uecker from comment #56)
> works as expected and is supported for older language modes

Even if one day projects, that will prefer to stay on C99 or C11 and use
-Wpedantic (which warns about [[]] right now), will be able to use [[syntax]]
without any warning, they may still not like it. Even if gcc will include
nodiscard into the __attribute__ syntax, there, for sure, will be the libraries
that won't prefer to update or use the new attribute.
For these situations, or even if they **will** use the new attribute, see my
previous paragraph.