{
if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
return 0;
+ /* pushdecl creates distinct types for TYPE_DECLs by calling
+ build_type_copy, so the above comparison generally fails. We do
+ another test against the TYPE_MAIN_VARIANT of the olddecl, which
+ is equivalent to what this code used to do before the build_type_copy
+ call. The variant type distinction should not matter for traditional
+ code, because it doesn't have type qualifiers. */
+ if (flag_traditional
+ && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
+ return 0;
if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
return 0;
return "redefinition of `%s'";