Fix each_linked_rlib when the current crate has 0 crate types

diff --git a/compiler/rustc_codegen_ssa/src/back/link.rs b/compiler/rustc_codegen_ssa/src/back/link.rs
index 71589e9993b7bd679e6493f956c3adef1898ffa1..e7df9cc695a45d11e7760a0eafa26f0f4d257eb7 100644 (file)
--- a/compiler/rustc_codegen_ssa/src/back/link.rs
+++ b/compiler/rustc_codegen_ssa/src/back/link.rs
@@ -230,6 +230,9 @@ pub fn each_linked_rlib(
                 });
             }
         }
+        if info.dependency_formats.is_empty() {
+            return Err(errors::LinkRlibError::MissingFormat);
+        }
         &info.dependency_formats[0].1
     } else {
         let fmts = info