Add swig binding and/or C-compiler-fe-based bindings generator

[graydon]

Start work on a "C library bindings" generator. This can take the form of a swig language binding, a gcc dehydra script, a clang plugin, or anything along these lines.

[brson]

@erickt has started building clang bindings git://github.com/erickt/rust-clang.git

[jckarter]

Just a heads up: it looks like @erickt's bindings are for libclang 3.0, which when I tried it, wasn't adequate for generating bindings. I submitted a patch a while back which is in 3.1svn that adds some necessary cursor types and entry points.

[erickt]

Great! I'm happy to update clang once our llvm fork can be updated too. Which revision did you add? I'm developing against r145776. I may be able to backport some of the changes into my helper library.

@brson, any luck getting the llvm patch upstreamed?

[brson]

Our llvm patches have been reviewed. I expect that we'll be back on llvm trunk this week.

[jckarter]

@erickt My patch was clang r145972. It applies fairly cleanly to vanilla 3.0 if you want to cherry-pick.

[graydon]

This has long since been "done" in the sense of bindgen existing. There's a bug on adopting it (#2045) so closing this.