The Galach programming language. Made for educational purposes to teach myself about building a compiler. The code is pretty macro-heavy, as a lot of this is just experimenting; I didn't do a whole lot of research into how conventional compilers are built, and for the most part I tried figuring it out on my own.

Galach compiles to bytecode and then runs in a virtual machine. Error messages were designed to be useful to the person debugging the compiler, not to the person writing the Galach code (likewise with the VM error messages). A bunch of important features are missing from the language, such as type safety, floating point arithmetic, and a standard library, among other things. The bytecode is unoptimized, and you can view it by running galach with the -d option.

Building the compiler is pretty simple. I tried to keep most of the source in C99.
To build debug, you can build and run with make run. To build the optimized executable, you can build and run with make MODE=prod run