[Bug c/52023] [C11] _Alignof (double) yields wrong value on x86

[jbglaw@lug-owl.de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52023

--- Comment #17 from Jan-Benedict Glaw <jbglaw@lug-owl.de> ---
(In reply to Marek Polacek from comment #16)
> >     tree field = build_decl (UNKNOWN_LOCATION, FIELD_DECL, NULL_TREE,
> >          ^
> > cc1plus: all warnings being treated as errors
> 
> Should be fixed now.

No, not yet. The most recent build for powerpc64-darwin done by my build robot
still faces this warning and thus breaks:

http://toolchain.lug-owl.de/buildbot/show_build_details.php?id=89063

-->
http://toolchain.lug-owl.de/buildbot/deliver_artifact.php?mode=view&id=733877

So what shall we do with this? The macro is called with two arguments, of which
one ("field") isn't used. Just mark it as unused or (void)-cast it away?