[m-dev.] turning on --halt-at-warn-if-possible

[Julien Fischer]

On Tue, 31 Jul 2018, Zoltan Somogyi wrote:

> I have a diff that add this new option to the .mgnuc_opts file in each
> directory. I have just committed a diff that fixes the last thing
> that causes gcc warnings during a hlc.gc bootcheck, so it is good to go,
> but I want to wait until (a) everyone has installed a compiler with the
> 9d46463 change I committed yesterday,

FYI, rotd-2018-07-31 (which was just uploaded) contains that commit.

Julien.