Comment by sfpotter

Here's one example of when to commit auto-generated code: if you use a tool like Cython and want to distribute sources to an end user, it is frequently recommended to distribute the C sources generated by Cython instead of the Cython code itself. The given reason is that the end user may not have access to Cython, but will likely have access to a C compiler. (This is frequently the case on scientific clusters where users don't have superuser privileges.)