A. Sophie Blee-Goldman

Results 2 issues of A. Sophie Blee-Goldman

Currently we believe this fix is only necessary for cleaning up some tests once shared runtimes are fully enabled by default, however the investigation is still open at this point.

Apparently we had "temporarily" disable the `-Werror` flag, which turned out to be over a year ago by now. This PR reenables it and handles all the warnings we have...