Index: llvm/trunk/lib/MC/MCParser/ELFAsmParser.cpp
===================================================================
--- llvm/trunk/lib/MC/MCParser/ELFAsmParser.cpp
+++ llvm/trunk/lib/MC/MCParser/ELFAsmParser.cpp
@@ -423,8 +423,12 @@
   if (L.isNot(AsmToken::Comma))
     return TokError("expected group name");
   Lex();
-  if (getParser().parseIdentifier(GroupName))
+  if (L.is(AsmToken::Integer)) {
+    GroupName = getTok().getString();
+    Lex();
+  } else if (getParser().parseIdentifier(GroupName)) {
     return true;
+  }
   if (L.is(AsmToken::Comma)) {
     Lex();
     StringRef Linkage;
Index: llvm/trunk/test/MC/ELF/comdat-name-number.s
===================================================================
--- llvm/trunk/test/MC/ELF/comdat-name-number.s
+++ llvm/trunk/test/MC/ELF/comdat-name-number.s
@@ -0,0 +1,28 @@
+// RUN: llvm-mc -triple x86_64-pc-linux-gnu %s -filetype=obj -o %t.o 
+// RUN: llvm-readobj -elf-section-groups %t.o | FileCheck %s
+
+// Test that we can handle numeric COMDAT names.
+
+.section .foo,"G",@progbits,123,comdat
+.section .bar,"G",@progbits,abc,comdat
+
+// CHECK:      Groups {
+// CHECK-NEXT:   Group {
+// CHECK-NEXT:     Name: .group
+// CHECK-NEXT:     Index:
+// CHECK-NEXT:     Type: COMDAT
+// CHECK-NEXT:     Signature: 123
+// CHECK-NEXT:     Section(s) in group [
+// CHECK-NEXT:       .foo
+// CHECK-NEXT:     ]
+// CHECK-NEXT:   }
+// CHECK-NEXT:   Group {
+// CHECK-NEXT:     Name: .group
+// CHECK-NEXT:     Index:
+// CHECK-NEXT:     Type: COMDAT
+// CHECK-NEXT:     Signature: abc
+// CHECK-NEXT:     Section(s) in group [
+// CHECK-NEXT:       .bar
+// CHECK-NEXT:     ]
+// CHECK-NEXT:   }
+// CHECK-NEXT: }