Warning patches:

Warning patches:

        * Makefile.in (lex.o): Depend on output.h.
        * call.c (add_function_candidate): Remove unused variable `cand'.
        (add_conv_candidate): Likewise.
        (build_builtin_candidate): Likewise.
        * cp-tree.h: Add prototype for `types_overlap_p'.
        * decl.c (signal_catch): Mark parameter `sig' with ATTRIBUTE_UNUSED.
        * decl2.c (merge_functions): Remove unused variables `tmp' and
        `tempn'.
        * error.c (expr_as_string): Mark parameter `v' with ATTRIBUTE_UNUSED.
        (code_as_string): Likewise.
        (language_as_string): Likewise.
        (parm_as_string): Likewise.
        (op_as_string): Likewise.
        (assop_as_string): Likewise.
        (cv_as_string): Likewise.
        * lex.c: Include output.h.
        * pt.c (type_unification): Cast first argument of `bzero' to a char*.
        * search.c (dfs_no_overlap_yet): Mark parameter `t' with
        ATTRIBUTE_UNUSED.
        * tinfo.cc (__class_type_info::dcast): Change the type of variable
        `i' from int to size_t.
        * typeck.c (language_lvalue_valid): Mark parameter `exp' with
        ATTRIBUTE_UNUSED.

From-SVN: r19707