Some time ago I (and some other CRAN package maintainers) got an email
from Brian Ripley (copied below) regarding compiler warnings under gcc
8.1. In my case this concerns package PropClust
(https://CRAN.R-project.org/package=PropClust). The check with gcc 8.1
(https://www.stats.ox.ac.uk/pub/bdr/gc
Good day,
The problem happens when using the makeCluster function from either parallel or
snow packages. I do not see a dialog box appear regarding Windows Firewall.
Turning off the firewall doesn't resolve the issue. I originally experienced
this issue while using bplapply defined in BiocParal