All tools should be libraries

[brson]

I want to be able to access cargo and rustdoc as libraries. We should just get in the habit of making everything a library.

Here is what I would like:

• src/rustc becomes src/librustc - It's already a library, but is structured oddly.
• src/cargo -> src/libcargo
• src/rustdoc -> src/librustdoc
• src/fuzzer -> src/libfuzzer
• Add driver/driver.rs

driver.rs looks like this

#[cfg(rustc)]
extern mod self = rustc(vers = "0.4");

#[cfg(rustdoc)]
extern mod self = rustdoc(vers = "0.4");

...

fn main() { self::main() }

We may also want some way to include the appropriate per-application crate attributes.

[graydon]

Works for me.

[catamorphism]

ff07e68 addresses all points except the first. Does the first point involve anything more than renaming the directory?

[brson]

Yeah, there's a little more to do. the rustc executable is actually built from rustc/driver/rustc.rs. The contents of this file should be folded into librustc and rustc's driver built using driver.rs.

[brson]

Fixed