Does anyone know of a way to create a build system that is always active? I’m writing a plugin that uses them, and I’d like to be able to have one whose selector applies to all files without blocking any other build systems from working.

How do you imagine this to work? Have one always active but don’t block others?

Anyway, the selector “source, text” will match everything but everything more specific like “source.python” will have precedence.

Basically, I want to know if there’s a way to have multiple build systems active at the same time, given, of course, that their selectors match the open file.
I imagined that the build system to be used with my plugin would apply to all files (with a selector like “source, text”, like you said) and if another one applied to the open file, it would also be active, but not take precedence over the first, so that both would work. However, I can’t figure out how to get this to work.