Index: COFF/InputFiles.cpp
===================================================================
--- COFF/InputFiles.cpp
+++ COFF/InputFiles.cpp
@@ -233,6 +233,12 @@
       return Symtab->addRegular(this, Name, Sym.getGeneric(), SC);
     return Symtab->addUndefined(Name, this, false);
   }
+  if (SC == PendingComdat) {
+    StringRef Name;
+    COFFObj->getSymbolName(Sym, Name);
+    log("comdat section " + Name + " without leader and unassociated, discarding");
+    return nullptr;
+  }
   if (SC)
     return make<DefinedRegular>(this, /*Name*/ "", false,
                                 /*IsExternal*/ false, Sym.getGeneric(), SC);
Index: test/COFF/pending-comdat.s
===================================================================
--- /dev/null
+++ test/COFF/pending-comdat.s
@@ -0,0 +1,21 @@
+# REQUIRES: x86
+
+# RUN: llvm-mc -triple=x86_64-windows-gnu %s -filetype=obj -o %t.obj
+
+# RUN: not lld-link -lldmingw -out:%t.exe -entry:main -subsystem:console %t.obj 2>&1 | FileCheck %s
+
+# CHECK: error: undefined symbol: other
+
+# Check that the comdat section without a symbol isn't left pending once we iterate symbols
+# to print source of the undefined symbol.
+
+	.text
+	.globl main
+main:
+	call other
+	ret
+
+	.section	.data$pending,"w"
+	.linkonce	discard
+.Llocal:
+	.byte	0