Index: COFF/Driver.cpp
===================================================================
--- COFF/Driver.cpp
+++ COFF/Driver.cpp
@@ -1236,6 +1236,9 @@
   // Read all input files given via the command line.
   run();
 
+  if (errorCount())
+    return;
+
   // We should have inferred a machine type by now from the input files, but if
   // not we assume x64.
   if (Config->Machine == IMAGE_FILE_MACHINE_UNKNOWN) {
Index: test/COFF/could-not-open.test
===================================================================
--- test/COFF/could-not-open.test
+++ test/COFF/could-not-open.test
@@ -0,0 +1,5 @@
+RUN: not lld-link 01 2>&1 | FileCheck %s
+
+CHECK:     could not open 01
+CHECK-NOT: /machine is not specified
+CHECK-NOT: subsystem must be defined