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C compiler written in Ruby
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C compiler written in Ruby.

Project Goal

For learning about compiler, for creating hackable C compiler, for creating benchmark target of CRuby.


Add this line to your application's Gemfile:

gem 'rucc'

And then execute:

$ bundle

Or install it yourself as:

$ gem install rucc


rucc compiles c code and generates executable binary. Tested only in Linux (Ubuntu 17.04).

// hello.c

#include "stdio.h"

int main(int argc, char** argv) {
  printf("Hello, World!\n");
$ rucc hello.c
$ ./a.out
Hello, World!

By using -S or -c option, rucc generates assembly source code (*.s) and object file(*.o).

$ rucc -S hello.c
$ ls
hello.c  hello.s
$ rucc -c hello.c
$ ls
hello.c  hello.o


After checking out the repo, run bin/setup to install dependencies. Then, run bin/rspec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to


  • Add PIC support
  • Build CRuby by rucc
  • Refactor
  • Add some CLI options
  • Impl some features
    • Support parentheses around function name


Bug reports and pull requests are welcome on GitHub at


The gem is available as open source under the terms of the MIT License.


This project is highly inspired by 8cc. Thanks to rui314!

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