[bootstrap-O3] add a default initializer to avoid a warning at -O3

[Jason Merrill]

On Wed, Jan 4, 2017 at 8:13 AM, Alexandre Oliva <aoliva@redhat.com> wrote:
> On Jan  3, 2017, Jason Merrill <jason@redhat.com> wrote:
>
>> Are there bugzillas for these false positive warnings?
>
> I don't think so.
>
> Did you mean in the sense that the patch silences them and thus "fixes"
> them, or in the sense that the underlying cause for the warnings is not
> fixed and someone might want to look into them at a later time?
>
> FWIW, I hadn't considered the latter (it doesn't seem too hard to find
> such warnings anyway; every time I try bootstrap-O3, which is not very
> often, I get a few of those), and the former didn't seem enough of a
> reason to have bug reports created.

The latter; false positive warnings like this are bugs that should be fixed.

Jason