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This is needed when building for a target whose ar & ranlib are incompatible with the current build system. For example, building for Windows on a Linux system. Then manually import the automake rule for libigen.a, but tweak the tool variables to use the FOR_BUILD variants.
= OVERVIEW = The Synacor Challenge is a fun programming exercise with a number of puzzles built into it. You can find more details about it here: https://challenge.synacor.com/ The first puzzle is writing an interpreter for their custom ISA. This is a simulator for that custom CPU. The CPU is quite basic: it's 16-bit with only 8 registers and a limited set of instructions. This means the port will never grow new features. See README.arch-spec for more details. Implementing it here ends up being quite useful: it acts as a simple constrained "real world" example for people who want to implement a new simulator for their own architecture. We demonstrate all the basic fundamentals (registers, memory, branches, and tracing) that all ports should have.