* rs6000.c (rs6000_override_options, ptt, rs6000_file_start,
        rs6000_float_const, rs6000_replace_regno, debug_stack_info,
        rs6000_output_load_toc_table, output_prolog, output_epilog):
        Const-ify a char*.
        (output_mi_thunk): Likewise.  Mark parameter `thunk_fndecl' with
        ATTRIBUTE_UNUSED.  Hide unused variables `r0', `sp', `toc',
        `schain', `r12', `buf' and `labelno'.
        (output_ascii): Const-ify a char*.
        (rs6000_gen_section_name): Initialize variable `last_period'.
        (rs6000_adjust_priority): Mark parameter `insn' with
        ATTRIBUTE_UNUSED.
        (rs6000_trampoline_template, rs6000_dll_import_ref,
        rs6000_longcall_ref, rs6000_encode_section_info): Const-ify a char*.
        * rs6000.h (offsettable_mem_operand, optimization_options): Add
        prototypes.
        * rs6000.md (movdi, define_split): Cast a value to HOST_WIDE_INT
        when comparing against one.

From-SVN: r26308