rustbuild: Remove the build directory

The organization in rustbuild was a little odd at the moment where the `lib.rs`
was quite small but the binary `main.rs` was much larger. Unfortunately as well
there was a `build/` directory with the implementation of the build system, but
this directory was ignored by GitHub on the file-search prompt which was a
little annoying.

This commit reorganizes rustbuild slightly where all the library files (the
build system) is located directly inside of `src/bootstrap` and all the binaries
now live in `src/bootstrap/bin` (they're small). Hopefully this should allow
GitHub to index and allow navigating all the files while maintaining a
relatively similar layout to the other libraries in `src/`.

src/bootstrap/Cargo.toml

@@ -9,15 +9,15 @@ path = "lib.rs"
 
 [[bin]]
 name = "bootstrap"
-path = "main.rs"
+path = "bin/main.rs"
 
 [[bin]]
 name = "rustc"
-path = "rustc.rs"
+path = "bin/rustc.rs"
 
 [[bin]]
 name = "rustdoc"
-path = "rustdoc.rs"
+path = "bin/rustdoc.rs"
 
 [dependencies]
 build_helper = { path = "../build_helper" }

src/bootstrap/main.rs → src/bootstrap/bin/main.rs

@@ -18,22 +18,10 @@
 #![deny(warnings)]
 
 extern crate bootstrap;
-extern crate build_helper;
-extern crate cmake;
-extern crate filetime;
-extern crate gcc;
-extern crate getopts;
-extern crate libc;
-extern crate num_cpus;
-extern crate rustc_serialize;
-extern crate toml;
-extern crate md5;
 
 use std::env;
 
-use build::{Flags, Config, Build};
-
-mod build;
+use bootstrap::{Flags, Config, Build};
 
 fn main() {
     let args = env::args().skip(1).collect::<Vec<_>>();

src/bootstrap/rustc.rs → src/bootstrap/bin/rustc.rs

@@ -53,13 +53,14 @@ fn main() {
 
     let rustc = env::var_os(rustc).unwrap();
     let libdir = env::var_os(libdir).unwrap();
-    let mut dylib_path = bootstrap::dylib_path();
+    let mut dylib_path = bootstrap::util::dylib_path();
     dylib_path.insert(0, PathBuf::from(libdir));
 
     let mut cmd = Command::new(rustc);
     cmd.args(&args)
        .arg("--cfg").arg(format!("stage{}", stage))
-       .env(bootstrap::dylib_path_var(), env::join_paths(&dylib_path).unwrap());
+       .env(bootstrap::util::dylib_path_var(),
+            env::join_paths(&dylib_path).unwrap());
 
     if let Some(target) = target {
         // The stage0 compiler has a special sysroot distinct from what we

src/bootstrap/rustdoc.rs → src/bootstrap/bin/rustdoc.rs

@@ -23,14 +23,15 @@ fn main() {
     let rustdoc = env::var_os("RUSTDOC_REAL").unwrap();
     let libdir = env::var_os("RUSTC_LIBDIR").unwrap();
 
-    let mut dylib_path = bootstrap::dylib_path();
+    let mut dylib_path = bootstrap::util::dylib_path();
     dylib_path.insert(0, PathBuf::from(libdir));
 
     let mut cmd = Command::new(rustdoc);
     cmd.args(&args)
        .arg("--cfg").arg(format!("stage{}", env::var("RUSTC_STAGE").unwrap()))
        .arg("--cfg").arg("dox")
-       .env(bootstrap::dylib_path_var(), env::join_paths(&dylib_path).unwrap());
+       .env(bootstrap::util::dylib_path_var(),
+            env::join_paths(&dylib_path).unwrap());
     std::process::exit(match cmd.status() {
         Ok(s) => s.code().unwrap_or(1),
         Err(e) => panic!("\n\nfailed to run {:?}: {}\n\n", cmd, e),