How do I invoke the build-script to build a cross compiler for a certain target?

Development Compiler
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Hi, a more focused question.

How do I invoke the build script to make a cross compiler for a specific target, e.g. MIPS, ARM, AVR, etc.?

I'm compiling on a 2016 MacBook Pro, running Mojave (x86_64, macOS).

My invocation using things like utils/build-script -R only seem to create a simple host compiler, not a cross compiler?

What extra flags do I need to use? I'm finding it a bit confusing and nothing I try works.