Build fails and there is no error (OSX)

I am experiencing the situation where it all works on Linux, but not on Mac. There’s no error message.

Here is a link to a broken job showing the situation:

Here is a link to the .travis.yml file

There’s no error in the log. There is a warning about doxygen. So, I did another one with the docs turned off and it still happened:

Here it is working in Linux with docs and all turned on:

That fixed it.

remove the set -e