Index: lld/trunk/test/ELF/gc-sections-no-undef-error.s
===================================================================
--- lld/trunk/test/ELF/gc-sections-no-undef-error.s
+++ lld/trunk/test/ELF/gc-sections-no-undef-error.s
@@ -0,0 +1,19 @@
+# REQUIRES: x86
+
+# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
+
+# Sanity check that the link will fail with the undefined error without
+# gc-sections.
+# RUN: not ld.lld %t.o -o %t 2>&1 | FileCheck %s
+# CHECK: error: undefined symbol: undefined
+
+# RUN: ld.lld %t.o --gc-sections -o %t
+
+.section .text.unused,"ax",@progbits
+unused:
+  callq undefined
+
+.text
+.global _start
+_start:
+  nop