auto merge of #15319 : alexcrichton/rust/no-crate-id, r=brson

This is an implementation of [RFC 35](https://github.com/rust-lang/rfcs/blob/master/active/0035-remove-crate-id.md).

The summary for this PR is the same as that of the RFC, with one addendum:


* Removes the `#[crate_id]` attribute and knowledge of versions from rustc.
* Added a `#[crate_name]` attribute similar to the old `#[crate_id]` attribute
* Output filenames no longer have versions or hashes
* Symbols no longer have versions (they still have hashes)
* A new flag, `--extern`, is used to override searching for external crates
* A new flag, `-C metadata=foo`, used when hashing symbols
* [added] An old flag, `--crate-name`, was re purposed to specify the crate name from the command line.

I tried to maintain backwards compatibility wherever possible (with warnings being printed). If I missed anywhere, however, please let me know!

[breaking-change]

Closes #14468
Closes #14469
Closes #14470
Closes #14471

6 files changed, 5 insertions, 95 deletions

diff --git a/src/test/compile-fail/bad-crate-id.rs b/src/test/compile-fail/bad-crate-id.rs
index 43956752cd9..883bfd035f4 100644
--- a/src/test/compile-fail/bad-crate-id.rs
+++ b/src/test/compile-fail/bad-crate-id.rs
@@ -8,7 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-extern crate foo = ""; //~ ERROR: malformed crate id
-extern crate bar = "#a"; //~ ERROR: malformed crate id
+extern crate foo = ""; //~ ERROR: crate name must not be empty
 
 fn main() {}
diff --git a/src/test/compile-fail/use-meta.rc b/src/test/compile-fail/bad-crate-id2.rs
index 9cb84c5400a..22e98b61c61 100644
--- a/src/test/compile-fail/use-meta.rc
+++ b/src/test/compile-fail/bad-crate-id2.rs
@@ -1,4 +1,4 @@
-// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //
@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// error-pattern:can't find crate for `std`
+extern crate bar = "#a"; //~ ERROR: invalid character `#` in crate name: `#a`
+
+fn main() {}
 
-extern crate std = "std#bogus";
diff --git a/src/test/compile-fail/crateresolve2.rs b/src/test/compile-fail/crateresolve2.rs
deleted file mode 100644
index c5e9d128152..00000000000
--- a/src/test/compile-fail/crateresolve2.rs
+++ /dev/null
@@ -1,24 +0,0 @@
-// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-// aux-build:crateresolve2-1.rs
-// aux-build:crateresolve2-2.rs
-// aux-build:crateresolve2-3.rs
-// error-pattern:using multiple versions of crate `crateresolve2`
-
-extern crate crateresolve2 = "crateresolve2#0.1";
-
-mod m {
-    pub extern crate crateresolve2 = "crateresolve2#0.2";
-}
-
-fn main() {
-    let x: int = false;
-}
diff --git a/src/test/compile-fail/crateresolve5.rs b/src/test/compile-fail/crateresolve5.rs
deleted file mode 100644
index 8b4801466b9..00000000000
--- a/src/test/compile-fail/crateresolve5.rs
+++ /dev/null
@@ -1,21 +0,0 @@
-// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-// aux-build:crateresolve5-1.rs
-// aux-build:crateresolve5-2.rs
-
-extern crate cr5_1 = "crateresolve5#0.1";
-extern crate cr5_2 = "crateresolve5#0.2";
-
-
-fn main() {
-    // Nominal types from two multiple versions of a crate are different types
-    assert!(cr5_1::nominal() == cr5_2::nominal()); //~ ERROR mismatched types: expected
-}
diff --git a/src/test/compile-fail/issue-11908-1.rs b/src/test/compile-fail/issue-11908-1.rs
deleted file mode 100644
index dbedf355a56..00000000000
--- a/src/test/compile-fail/issue-11908-1.rs
+++ /dev/null
@@ -1,24 +0,0 @@
-// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-// aux-build:issue-11908-1.rs
-// ignore-android this test is incompatible with the android test runner
-// error-pattern: multiple dylib candidates for `url` found
-
-// This test ensures that if you have the same rlib or dylib at two locations
-// in the same path that you don't hit an assertion in the compiler.
-//
-// Note that this relies on `liburl` to be in the path somewhere else,
-// and then our aux-built libraries will collide with liburl (they have
-// the same version listed)
-
-extern crate url;
-
-fn main() {}
diff --git a/src/test/compile-fail/issue-11908-2.rs b/src/test/compile-fail/issue-11908-2.rs
deleted file mode 100644
index 8b916aad653..00000000000
--- a/src/test/compile-fail/issue-11908-2.rs
+++ /dev/null
@@ -1,21 +0,0 @@
-// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-// aux-build:issue-11908-2.rs
-// no-prefer-dynamic
-// ignore-android this test is incompatible with the android test runner
-// error-pattern: multiple rlib candidates for `url` found
-
-// see comments in issue-11908-1 for what's going on here
-
-extern crate url;
-
-fn main() {}
-