try to infer linker flavor from linker name and vice versa

src/librustc_codegen_llvm/back/write.rs

@@ -1503,12 +1503,17 @@ fn start_executing_work(tcx: TyCtxt,
 
     let assembler_cmd = if modules_config.no_integrated_as {
         // HACK: currently we use linker (gcc) as our assembler
-        let (name, mut cmd) = get_linker(sess);
-        cmd.args(&sess.target.target.options.asm_args);
-        Some(Arc::new(AssemblerCommand {
-            name,
-            cmd,
-        }))
+        if let Ok((linker, flavor)) = link::linker_and_flavor(sess) {
+            let (name, mut cmd) = get_linker(sess, &linker, flavor);
+            cmd.args(&sess.target.target.options.asm_args);
+            Some(Arc::new(AssemblerCommand {
+                name,
+                cmd,
+            }))
+        } else {
+            sess.abort_if_errors();
+            None
+        }
     } else {
         None
     };