For those interested in GNU GCC, there is a more recent document been writing here:<p><a href="http:&#x2F;&#x2F;thinkingeek.com&#x2F;gcc-tiny&#x2F;" rel="nofollow">http:&#x2F;&#x2F;thinkingeek.com&#x2F;gcc-tiny&#x2F;</a><p>The author is also writing blog posts about how to code a GCC frontend. Here is the 7º part:<p><a href="http:&#x2F;&#x2F;thinkingeek.com&#x2F;2016&#x2F;01&#x2F;19&#x2F;tiny-gcc-front-part-7&#x2F;" rel="nofollow">http:&#x2F;&#x2F;thinkingeek.com&#x2F;2016&#x2F;01&#x2F;19&#x2F;tiny-gcc-front-part-7&#x2F;</a>