[patch, gfortran] PR48298 DTIO, implement size=

[Jerry DeLisle]

Hi all,

The attached patch enables the size= specifier in a READ statement to work with 
child DTIO procedures. This is accomplished by moving the size_used variable 
from the dtp structure to the gfc_unit structure so that the accumulation of 
bytes during READ is carried across the procedures via the UNIT.

As far as I know, this is the last DTIO patch needed for full implementation and 
will close the PR.

After this patch is committed I plan to prepare a clean up patch to reorganize 
the dtp structure and clear at least one TODO related to stream IO. The 
follow-on patch will bump the major version number of libgfortran to 4.

Regression tested on x86-64-linux. New test case attached.

OK for trunk?

Jerry

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): Likewise. (read_sf): Likewise.
	(read_block_form): Likewise. (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.


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