re PR fortran/48298 ([F03] User-Defined Derived-Type IO (DTIO))

2016-10-17  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR fortran/48298
	* io/io.h: Move size_used from dtp to unit structure. Add bool
	has_size to unit structure.
	* read.c (read_x): Use has_size and size_used.
	* transfer.c (read_sf_internal,read_sf,read_block_form,
	read_block_form4): Likewise.
	(data_transfer_init): If parent, initialize the size variables.
	(finalize_transfer): Set the size variable using size_used in
	gfc_unit. (write_block): Delete bogus/dead code.

	* gfortran.dg/dtio_17.f90: New test.

From-SVN: r241294