Building an R package on Travis, how not to treat warnings as errors?

Question

I'm building an R package on Travis to share the integration status with users of the package. I have no errors but 8 warnings and I would like to ignore them for the moment. But travis considered the build a failure and returns the message on the last line of the R CMD check log:

Found warnings, treating as errors (as requested)

How to ignore warnings?

Answer 1

All you need to do is have

warnings_are_errors: false

near the top of your .travis.yml file

Here is an example from one of my R packages.