How do I stop roscpp from logging?

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I've not verified whether this works, but according to wiki/rosconsole - Disable all logging:

7.1 With a configuration file

Create a custom rosconsole configuration file with the following content and use it as described above:

log4j.threshold=OFF

There have been users reporting difficulty using it though: #q292112.

It's also discussed in ros/ros_comm#139.

I seem to remember some files will still be created, but I'm not sure about that.

Edit: I believe ros/ros_comm#1425 is meant to fix that. Documented here: wiki/rosout - rosout.log:

rosout node by default logs all messages into rosout.log in the ROS log directory.

New in Melodic This can be disabled by setting environment variable ROSOUT_DISABLE_FILE_LOGGING to True when launching roscore.