re PR fortran/67177 (MOVE_ALLOC not automatically allocating deferred character arrays in derived types)

2015-10-18  Paul Thomas  <pault@gcc.gnu.org>

	PR fortran/67177
	PR fortran/67977
	* primary.c (match_substring): Add an argument 'deferred' to
	flag that a substring reference with null start and end should
	not be optimized away for deferred length strings.
	(match_string_constant, gfc_match_rvalue): Set the argument.
	* trans-expr.c (alloc_scalar_allocatable_for_assignment): If
	there is a substring reference return.
	* trans-intrinsic.c (conv_intrinsic_move_alloc): For deferred
	characters, assign the 'from' string length to the 'to' string
	length. If the 'from' expression is deferred, set its string
	length to zero. If the 'to' expression has allocatable
	components, deallocate them.

2015-10-18  Paul Thomas  <pault@gcc.gnu.org>

	PR fortran/67177
	* gfortran.dg/move_alloc_15.f90: New test
	* gfortran.dg/move_alloc_16.f90: New test

	PR fortran/67977
	* gfortran.dg/deferred_character_assignment_1.f90: New test

From-SVN: r228940