Hi,

Please take a look at the attached patch and let me know your comments.

Thanks.

Qing

gcc/ChangeLog:

2020-04-03  qing zhao  <qing.zhao@oracle.com>

	* common.opt: Add -flocation-ranges.
	* doc/invoke.texi: Document it.
	* toplev.c (process_options): set line_table->default_range_bits
	to 0 when flag_location_ranges is false.