Index: cfe/trunk/lib/Sema/SemaDecl.cpp
===================================================================
--- cfe/trunk/lib/Sema/SemaDecl.cpp
+++ cfe/trunk/lib/Sema/SemaDecl.cpp
@@ -3560,6 +3560,9 @@
 
 void Sema::setTagNameForLinkagePurposes(TagDecl *TagFromDeclSpec,
                                         TypedefNameDecl *NewTD) {
+  if (TagFromDeclSpec->isInvalidDecl())
+    return;
+
   // Do nothing if the tag already has a name for linkage purposes.
   if (TagFromDeclSpec->hasNameForLinkage())
     return;
Index: cfe/trunk/test/Sema/enum.c
===================================================================
--- cfe/trunk/test/Sema/enum.c
+++ cfe/trunk/test/Sema/enum.c
@@ -119,3 +119,7 @@
 
 typedef enum { NegativeShort = (short)-1 } NegativeShortEnum;
 int NegativeShortTest[NegativeShort == -1 ? 1 : -1];
+
+// PR24610
+enum Color { Red, Green, Blue }; // expected-note{{previous use is here}}
+typedef struct Color NewColor; // expected-error {{use of 'Color' with tag type that does not match previous declaration}}