Upgraded warning for invalid crate_type attribute syntax to an error

If the user intended to set the crate_type to "lib" but accidentally used
incorrect syntax such as `#![crate_type(lib)]`, the compilation would fail with
"main function not found". This made it hard to locate the source of the
problem, since the failure would cause the warning about the incorrect
attribute not to be shown.

2 files changed, 16 insertions, 5 deletions

diff --git a/src/librustc_driver/driver.rs b/src/librustc_driver/driver.rs
index 154e0a1f644..a956b173f96 100644
--- a/src/librustc_driver/driver.rs
+++ b/src/librustc_driver/driver.rs
@@ -871,11 +871,8 @@ pub fn collect_crate_types(session: &Session,
                     None
                 }
                 _ => {
-                    session.add_lint(lint::builtin::UNKNOWN_CRATE_TYPES,
-                                     ast::CRATE_NODE_ID,
-                                     a.span,
-                                     "`crate_type` requires a \
-                                      value".to_string());
+                    session.span_err(a.span, "`crate_type` requires a value");
+                    session.note("for example: `#![crate_type=\"lib\"]`");
                     None
                 }
             }
diff --git a/src/test/compile-fail/invalid_crate_type_syntax.rs b/src/test/compile-fail/invalid_crate_type_syntax.rs
new file mode 100644
index 00000000000..6d42515704e
--- /dev/null
+++ b/src/test/compile-fail/invalid_crate_type_syntax.rs
@@ -0,0 +1,14 @@
+// Copyright 2015 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.
+
+// regression test for issue 16974
+#![crate_type(lib)]  //~ ERROR `crate_type` requires a value
+
+fn my_lib_fn() {}