Index: lld/trunk/ELF/Target.cpp
===================================================================
--- lld/trunk/ELF/Target.cpp
+++ lld/trunk/ELF/Target.cpp
@@ -393,7 +393,7 @@
   case R_386_NONE:
     return R_HINT;
   default:
-    error("unknown relocation type: " + toString(Type));
+    error(toString(S.File) + ": unknown relocation type: " + toString(Type));
     return R_HINT;
   }
 }
@@ -674,7 +674,7 @@
   case R_X86_64_NONE:
     return R_HINT;
   default:
-    error("unknown relocation type: " + toString(Type));
+    error(toString(S.File) + ": unknown relocation type: " + toString(Type));
     return R_HINT;
   }
 }
@@ -1627,7 +1627,7 @@
   case R_AMDGPU_GOTPCREL32_HI:
     return R_GOT_PC;
   default:
-    error("unknown relocation type: " + toString(Type));
+    error(toString(S.File) + ": unknown relocation type: " + toString(Type));
     return R_HINT;
   }
 }
Index: lld/trunk/test/ELF/invalid/invalid-relocation-x64.test
===================================================================
--- lld/trunk/test/ELF/invalid/invalid-relocation-x64.test
+++ lld/trunk/test/ELF/invalid/invalid-relocation-x64.test
@@ -26,5 +26,5 @@
         Type:            R_X86_64_NONE
 
 # RUN: not ld.lld %p/Inputs/invalid-relocation-x64.elf -o %t2 2>&1 | FileCheck %s
-# CHECK: unknown relocation type: Unknown (152)
-# CHECK: unknown relocation type: Unknown (153)
+# CHECK: {{.*}}invalid-relocation-x64.elf: unknown relocation type: Unknown (152)
+# CHECK: {{.*}}invalid-relocation-x64.elf: unknown relocation type: Unknown (153)