console for custom_target()This keyword argument conflicts with capture, and is meant for commands that are resource-intensive and take a long time to finish. With the Ninja backend, setting this will add this target to Ninja's console pool, which has special properties such as not buffering stdout and serializing all targets in this pool.
The primary use-case for this is to be able to run external commands that take a long time to exeute. Without setting this, the user does not receive any feedback about what the program is doing.