* config.gcc (i[34567]86-*-darwin*): New configuration.
        * config/darwin.h (TARGET_ENCODE_SECTION_INFO): Undefine before
        defining.
        (TARGET_ENCODE_SECTION_INFO): Ditto.
        (ASM_PREFERRED_EH_DATA_FORMAT): Ditto.
        * config/darwin.c (machopic_indirect_data_reference): Remove
        setting of RTX_UNCHANGING_P.
        (machopic_legitimize_pic_address): Move RTX_UNCHANGING_P up so as
        * config/i386/t-darwin: New file.
        * config/i386/darwin.h: New file.
        * config/i386/i386.h (TARGET_MACHO): Add default definition.
        * config/i386/i386.md (tablejump): Add TARGET_MACHO case.
        * config/i386/i386.c (output_set_got): For Mach-O, output Mach-O
        label and not the GOT add.
        (constant_address_p): For Mach-O, seeing a CONST is enough.
        (legitimate_pic_address_disp_p): Add a Mach-O case.
        (legitimate_address_p): Also test machopic_operand_p if Mach-O.
        (legitimize_pic_address): Use generic Mach-O code to legitimize.
        (output_pic_addr_const): Suppress @PLT if Mach-O, and parens
        if outputting a difference.
        (ix86_output_addr_diff_elt): Add Mach-O case.
        (ix86_expand_move): Similarly.
        (ix86_expand_call): Similarly.
        (current_machopic_label_num): New global.
        (machopic_output_stub): New function.
        (ix86_value_regno): New function.
        (ix86_function_value): Use it instead of VALUE_REGNO.
        (ix86_libcall_value): Ditto.
        * config/i386/unix.h (VALUE_REGNO): Remove.

From-SVN: r55916