* gcov.c (bb_file_time): New static variable.

	* gcov.c (bb_file_time): New static variable.
	(object_directory): May also be object file.
	(preserve_paths): New static variable.
	(print_usage): Adjust.
	(options): Adjust.
	(process_args): Adjust.
	(open_files): Simplify. Cope when OBJECT_DIRECTORY is an object
	file. Find modification date on bb file.
	(read_profile): Don't rewind a NULL file.
	(format_hwint): New static function.
	(function_summary): Use format_hwint.
	(output_data): SOURCE_FILE_NAME is never relative to
	OBJECT_DIRECTORY. Use format_hwint. Adjust gcov file name
	mangling. Adjust output format to make it more machine readable.
	* doc/gcov.texi: Document & clarify semantics.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@56028 138bc75d-0d04-0410-961f-82ee72b054a4