re PR fortran/51976 ([F2003] Support deferred-length character components of derived...

re PR fortran/51976 ([F2003] Support deferred-length character components of derived types (allocatable string length))

2014-03-06  Paul Thomas  <pault@gcc.gnu.org>
	    Janus Weil  <janus@gcc.gnu.org>

	PR fortran/51976
	* gfortran.h (symbol_attribute): Add deferred_parameter attribute.
	* primary.c (build_actual_constructor): It is not an error if
	a missing component has the deferred_parameter attribute;
	equally, if one is given a value, it is an error.
	* resolve.c (resolve_fl_derived0): Remove error for deferred
	character length components.  Add the hidden string length
	field to the structure. Give it the deferred_parameter
	attribute.
	* trans-array.c (duplicate_allocatable): Add a strlen field
	which is used as the element size if it is non-null.
	(gfc_duplicate_allocatable, gfc_copy_allocatable_data): Pass a
	NULL to the new argument in duplicate_allocatable.
	(structure_alloc_comps): Set the hidden string length as
	appropriate. Use it in calls to duplicate_allocatable.
	(gfc_alloc_allocatable_for_assignment): When a deferred length
	backend declaration is variable, use that; otherwise use the
	string length from the expression evaluation.
	* trans-expr.c (gfc_conv_component_ref): If this is a deferred
	character length component, the string length should have the
	value of the hidden string length field.
	(gfc_trans_subcomponent_assign): Set the hidden string length
	field for deferred character length components.  Allocate the
	necessary memory for the string.
	(alloc_scalar_allocatable_for_assignment): Same change as in
	gfc_alloc_allocatable_for_assignment above.
	* trans-stmt.c (gfc_trans_allocate): Likewise.
	* trans-intrinsic (size_of_string_in_bytes): Make non-static.
	* trans-types.c (gfc_get_derived_type): Set the tree type for
	a deferred character length component.
	* trans.c (gfc_deferred_strlen): New function.
	* trans.h (size_of_string_in_bytes,gfc_deferred_strlen): New prototypes.

2014-03-06  Paul Thomas  <pault@gcc.gnu.org>
	    Janus Weil  <janus@gcc.gnu.org>

	PR fortran/51976
	* gfortran.dg/deferred_type_component_1.f90 : New test.
	* gfortran.dg/deferred_type_component_2.f90 : New test.

Co-Authored-By: Janus Weil <janus@gcc.gnu.org>
From-SVN: r208386