[gold commit] Add --debug=plugin option to record plugin actions

Cary Coutant ccoutant@gmail.com
Fri Mar 23 17:09:00 GMT 2018

With --debug=plugin, gold will log all plugin actions to a log file,
and make copies of plugin-supplied replacement files in a temporary
directory created under the current working directory.


            * debug.h (DEBUG_PLUGIN): New constant.
            (DEBUG_ALL): Add DEBUG_PLUGIN.
            (debug_string_to_enum): Likewise.
            * plugin.cc (make_sized_plugin_object): Add filename parameter.
            (Plugin_recorder): New class.
            (Plugin_manager::~Plugin_manager): Delete recorder_.
            (Plugin_manager::load_plugins): Create and initialize recorder_.
            (Plugin_manager::claim_file): Record claimed and unclaimed files.
            (Plugin_manager::make_plugin_object): Use object name as name for
            plugin object, if available.
            (Plugin_manager::add_input_file): Record replacement files.
            (Sized_pluginobj::do_add_symbols): Record plugin symbols.
            (Plugin_finish::run): Call Plugin_recorder::finish().
            (make_sized_plugin_object): Add filename parameter and pass to
            Sized_pluginobj constructor.
            * plugin.h (Plugin::filename): New method.
            (Plugin::recorder): New method.
            (Plugin::recorder_): New data member.
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