2019-02-19  Chung-Lin Tang <cltang@codesourcery.com>

	PR c/87924
	gcc/c/
	* c-parser.c (c_parser_oacc_clause_wait): Add representation of wait
	clause without argument as 'wait (GOMP_ASYNC_NOVAL)', adjust comments.

	gcc/cp/
	* parser.c (cp_parser_oacc_clause_wait): Add representation of wait
	clause without argument as 'wait (GOMP_ASYNC_NOVAL)', adjust comments.

	gcc/fortran/
	* openmp.c (gfc_match_omp_clauses): Add representation of wait clause
	without argument as 'wait (GOMP_ASYNC_NOVAL)'.

	libgomp/
	* oacc-parallel.c (GOACC_parallel_keyed): Remove condition on call to
	goacc_wait().
	(goacc_wait): Handle ACC_ASYNC_NOVAL case, remove goacc_thread() call
	and related adjustment.

	Reviewed-by: Thomas Schwinge  <thomas@codesourcery.com>

From-SVN: r269016