Documentation

Contains enough information for the native code generator to emit code for this platform.

Architectures that the native code generator knows about. TODO: It might be nice to extend these constructors with information about what instruction set extensions an architecture might support.

Operating systems that the native code generator knows about. Having OSUnknown should produce a sensible default, but no promises.

ARM Instruction Set Architecture and Extensions

This predicates tells us whether the OS supports ELF-like shared libraries.