Currently we only make use of this directive when it is associated
with an allocate statement.

gcc/fortran/ChangeLog:

	* dump-parse-tree.cc (show_omp_node): Handle EXEC_OMP_ALLOCATE.
	(show_code_node): Likewise.
	* gfortran.h (enum gfc_statement): Add ST_OMP_ALLOCATE.
	(OMP_LIST_ALLOCATOR): New enum value.
	(enum gfc_exec_op): Add EXEC_OMP_ALLOCATE.
	* match.h (gfc_match_omp_allocate): New function.
	* openmp.cc (enum omp_mask1): Add OMP_CLAUSE_ALLOCATOR.
	(OMP_ALLOCATE_CLAUSES): New define.
	(gfc_match_omp_allocate): New function.
	(resolve_omp_clauses): Add ALLOCATOR in clause_names.
	(omp_code_to_statement): Handle EXEC_OMP_ALLOCATE.
	(EMPTY_VAR_LIST): New define.
	(check_allocate_directive_restrictions): New function.
	(gfc_resolve_omp_allocate): Likewise.
	(gfc_resolve_omp_directive): Handle EXEC_OMP_ALLOCATE.
	* parse.cc (decode_omp_directive): Handle ST_OMP_ALLOCATE.
	(next_statement): Likewise.
	(gfc_ascii_statement): Likewise.
	* resolve.cc (gfc_resolve_code): Handle EXEC_OMP_ALLOCATE.
	* st.cc (gfc_free_statement): Likewise.
	* trans.cc (trans_code): Likewise
---
 gcc/fortran/dump-parse-tree.cc                |   3 +
 gcc/fortran/gfortran.h                        |   4 +-
 gcc/fortran/match.h                           |   1 +
 gcc/fortran/openmp.cc                         | 199 +++++++++++++++++-
 gcc/fortran/parse.cc                          |  10 +-
 gcc/fortran/resolve.cc                        |   1 +
 gcc/fortran/st.cc                             |   1 +
 gcc/fortran/trans.cc                          |   1 +
 gcc/testsuite/gfortran.dg/gomp/allocate-4.f90 | 112 ++++++++++
 gcc/testsuite/gfortran.dg/gomp/allocate-5.f90 |  73 +++++++
 10 files changed, 400 insertions(+), 5 deletions(-)
 create mode 100644 gcc/testsuite/gfortran.dg/gomp/allocate-4.f90
 create mode 100644 gcc/testsuite/gfortran.dg/gomp/allocate-5.f90