auto merge of #8976 : alexcrichton/rust/issue-5425, r=pnkfelix

Closes #5425

src/librustc/back/link.rs

@@ -616,6 +616,10 @@ fn crate_meta_name(sess: Session, output: &Path, opt_name: Option<@str>)
                                            || fmt!("output file name `%s` doesn't\
                                                     appear to have a stem",
                                                    output.to_str())).to_managed();
+                if name.is_empty() {
+                    sess.fatal("missing crate link meta `name`, and the \
+                                inferred name is blank");
+                }
                 warn_missing(sess, "name", name);
                 name
             }