[PATCH][GOLD] Fix some issues in building ARM Linux kernel with gold.

[=?big5?b?RG91ZyBLd2FuICjD9q62vHcp?= <dougkwan at google dot com>]

Hi Ian,


    This patch fixes some issues I encountered when I was attempting
to build the ARM Linux kernel.  It adds new options -EL, -EB,
--no-warn-mismatch and -p.  The -p option really does nothing and is
provided for compatibility with ld.  The --no-warn-mismatch options is
used to suppress warnings in attributes and processor-specific flags.
That could have done differently by changing the Error class and
providing a derived class that drops all warnings but I think my patch
is simpler.

-Doug

2010-03-29  Doug Kwan  <dougkwan@google.com>

        * arm.cc (Arm_relobj::Arm_relobj): Initialize
        merge_flags_and_attribures.
        (Arm_relobj::merge_flags_and_attributes): New method.
        (Arm_relobj::merge_flags_and_attributes_): New data member.
        (Arm_exidx_cantunwind::do_fixed_endian_write): Fix formatting.
        (Arm_relobj::scan_sections_for_stubs): Ditto.
        (Arm_relobj::do_read_symbols): Check to see if we really want to
        merge processor-specific flags and attributes.  Exit early if
        an object is empty except for section names and the undefined symbol.
        (Target_arm::do_finalize_sections): Move check for ELF format to
        Arm_relobj::do_read_symbols.  Merge processor specific flags and
        attributes from a regular object only when we have determined that
        it is aapropriate.  Do not create an .ARM.attributes section in
        output if there is no regular input object.
        (Target_arm::merge_processor_specific_flags): Check
        --warn-mismatch before printing any error.
        (Target_arm::merge_object_attributes): Ditto.
        * gold.cc (queue_middle_tasks): Handle the case in which there is
        no regular object in input.
        * options.cc (General_options::parse_EB): New method.
        (General_options::parse_EL): Same.
        (General_options::General_options): Initialize endianity_.
        * options.h (-EB, -EL, -p, --warn-mismatch): New options.
        (General_options::Endianity): New enum.
        (General_options::endianity): New method.
        (General_options::endianity_): New data member.
        * parameters.cc (Parameters::set_options): Check target endianity.
        (Parameters::set_target_once): Ditto.
        (Parameters::check_target_endianity): New method.
        (parameters_force_valid_target): If either -EL or -EB is specified,
        use it to define endianity of default target.
        * parameters.h (Parameters::check_target_endianity): New method
        declaration.

Attachment: patch-kernel.txt
Description: Text document