re PR c++/61811 (Firefox LTO build error due to undefined symbols)

	PR c++/61811
	* decl2.c (maybe_emit_vtables): Return true for -fuse-all-virtuals.

From-SVN: r212576

gcc/cp/ChangeLog

 2014-07-15  Jason Merrill  <jason@redhat.com>
 
+	PR c++/61811
+	* decl2.c (maybe_emit_vtables): Return true for -fuse-all-virtuals.
+
 	PR c++/60848
 	PR c++/61723
 	* call.c (is_std_init_list): Don't check CLASSTYPE_TEMPLATE_INFO.

gcc/cp/decl2.c

@@ -2014,11 +2014,15 @@ maybe_emit_vtables (tree ctype)
       if (DECL_COMDAT (primary_vtbl)
 	  && CLASSTYPE_DEBUG_REQUESTED (ctype))
 	note_debug_info_needed (ctype);
-      if (mark_all_virtuals)
-	/* Make sure virtual functions get instantiated/synthesized so that
-	   they can be inlined after devirtualization even if the vtable is
-	   never emitted.  */
-	mark_vtable_entries (primary_vtbl);
+      if (mark_all_virtuals && !DECL_ODR_USED (primary_vtbl))
+	{
+	  /* Make sure virtual functions get instantiated/synthesized so that
+	     they can be inlined after devirtualization even if the vtable is
+	     never emitted.  */
+	  mark_used (primary_vtbl);
+	  mark_vtable_entries (primary_vtbl);
+	  return true;
+	}
       return false;
     }