2016-03-12  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
	    Harold Anlauf  <anlauf@gmx.de>

	PR fortran/69520
	* invoke.texi: Explain use of the 'no-' construct within the
	-fcheck= option.
	* options.c (gfc_handle_runtime_check_option): Enable use of
	'no-' prefix for the various options with -fcheck= to allow
	negating previously enabled check options.

Co-Authored-By: Harald Anlauf <anlauf@gmx.de>

From-SVN: r234167