Depend on getopts from crates.io

rustc_session exports it for other crates to avoid mismatching
crate versions.

Author: luca-barbieri

Cargo.lock

@@ -4201,6 +4201,7 @@ dependencies = [
 name = "rustc_session"
 version = "0.0.0"
 dependencies = [
+ "getopts",
  "log",
  "num_cpus",
  "rustc_ast",

src/librustc_driver/lib.rs

@@ -8,7 +8,6 @@
 #![feature(nll)]
 #![recursion_limit = "256"]
 
-pub extern crate getopts;
 #[macro_use]
 extern crate log;
 #[macro_use]
@@ -35,6 +34,7 @@ use rustc_save_analysis::DumpHandler;
 use rustc_serialize::json::{self, ToJson};
 use rustc_session::config::nightly_options;
 use rustc_session::config::{ErrorOutputType, Input, OutputType, PrintRequest};
+use rustc_session::getopts;
 use rustc_session::lint::{Lint, LintId};
 use rustc_session::{config, DiagnosticOutput, Session};
 use rustc_session::{early_error, early_warn};

src/librustc_interface/tests.rs

@@ -1,5 +1,3 @@
-extern crate getopts;
-
 use crate::interface::parse_cfgspecs;
 
 use rustc_data_structures::fx::FxHashSet;
@@ -9,6 +7,7 @@ use rustc_session::config::{build_configuration, build_session_options, to_crate
 use rustc_session::config::{rustc_optgroups, ErrorOutputType, ExternLocation, Options, Passes};
 use rustc_session::config::{ExternEntry, LinkerPluginLto, LtoCli, SwitchWithOptPath};
 use rustc_session::config::{Externs, OutputType, OutputTypes, SymbolManglingVersion};
+use rustc_session::getopts;
 use rustc_session::lint::Level;
 use rustc_session::search_paths::SearchPath;
 use rustc_session::{build_session, Session};

src/librustc_session/Cargo.toml

@@ -9,6 +9,7 @@ name = "rustc_session"
 path = "lib.rs"
 
 [dependencies]
+getopts = "0.2"
 log = "0.4"
 rustc_errors = { path = "../librustc_errors" }
 rustc_feature = { path = "../librustc_feature" }

src/librustc_session/lib.rs

@@ -3,7 +3,6 @@
 
 // Use the test crate here so we depend on getopts through it. This allow tools to link to both
 // librustc_session and libtest.
-extern crate getopts;
 extern crate test as _;
 
 pub mod cgu_reuse_tracker;
@@ -23,3 +22,5 @@ mod session;
 pub use session::*;
 
 pub mod output;
+
+pub use getopts;

src/librustdoc/config.rs

@@ -10,6 +10,7 @@ use rustc_session::config::{
     nightly_options,
 };
 use rustc_session::config::{CodegenOptions, DebuggingOptions, ErrorOutputType, Externs};
+use rustc_session::getopts;
 use rustc_session::lint::Level;
 use rustc_session::search_paths::SearchPath;
 use rustc_span::edition::{Edition, DEFAULT_EDITION};

src/librustdoc/lib.rs

@@ -15,7 +15,6 @@
 #![recursion_limit = "256"]
 
 extern crate env_logger;
-extern crate getopts;
 extern crate rustc_ast;
 extern crate rustc_ast_pretty;
 extern crate rustc_attr;
@@ -51,6 +50,7 @@ use std::panic;
 use std::process;
 
 use rustc_session::config::{make_crate_type_option, ErrorOutputType, RustcOptGroup};
+use rustc_session::getopts;
 use rustc_session::{early_error, early_warn};
 
 #[macro_use]