plugins.texi (Interacting with the GCC Garbage Collector): Mention the plugin mode...

plugins.texi (Interacting with the GCC Garbage Collector): Mention the plugin mode of gengtype.

2009-06-16  Basile Starynkevitch  <basile@starynkevitch.net>

	* gcc/doc/plugins.texi (Interacting with the GCC Garbage Collector):
	Mention the plugin mode of gengtype.
	* gcc/doc/gty.texi (Source Files Containing Type Information):
	Likewise.
	* gcc/gengtype.c: Updated copyright.
	(plugin_files, nb_plugin_files) Added new static variables.
	(measure_input_list) Care about plugin_files.
	(write_rtx_next): Added early return in plugin mode.
	(create_file): Updated copyright year in generated file. Added
	asserts.
	(oprintf): Added early return if NULL outf.
	(get_output_file_with_visibility): Care of plugin_files.
	(get_output_file_name): May return null.
	(write_local): Added early return.
	(put_mangled_filename): Ditto.
	(finish_root_table): Added check for base_files.
	(write_roots): Care about null when plugins.
	(main): Added plugin mode.

From-SVN: r148515