Fortran: Add OpenMP's nothing directive support

Fortran version of commit 5079b7781a2c506dcdfb241347d74c7891268225

gcc/fortran/ChangeLog:

	* match.h (gfc_match_omp_nothing): New.
	* openmp.c (gfc_match_omp_nothing): New.
	* parse.c (decode_omp_directive): Match 'nothing' directive.

gcc/testsuite/ChangeLog:

	* gfortran.dg/nothing-1.f90: New test.
	* gfortran.dg/nothing-2.f90: New test.

3 files changed, 15 insertions, 0 deletions

diff --git a/gcc/fortran/match.h b/gcc/fortran/match.h
index aac16a8..5127b4b 100644
--- a/gcc/fortran/match.h
+++ b/gcc/fortran/match.h
@@ -175,6 +175,7 @@ match gfc_match_omp_masked_taskloop_simd (void);
 match gfc_match_omp_master (void);
 match gfc_match_omp_master_taskloop (void);
 match gfc_match_omp_master_taskloop_simd (void);
+match gfc_match_omp_nothing (void);
 match gfc_match_omp_ordered (void);
 match gfc_match_omp_ordered_depend (void);
 match gfc_match_omp_parallel (void);
diff --git a/gcc/fortran/openmp.c b/gcc/fortran/openmp.c
index 9675b65..fd219dc 100644
--- a/gcc/fortran/openmp.c
+++ b/gcc/fortran/openmp.c
@@ -4797,6 +4797,17 @@ gfc_match_omp_ordered (void)
   return match_omp (EXEC_OMP_ORDERED, OMP_ORDERED_CLAUSES);
 }
 
+match
+gfc_match_omp_nothing (void)
+{
+  if (gfc_match_omp_eos () != MATCH_YES)
+    {
+      gfc_error ("Unexpected junk after $OMP NOTHING statement at %C");
+      return MATCH_ERROR;
+    }
+  /* Will use ST_NONE; therefore, no EXEC_OMP_ is needed.  */
+  return MATCH_YES;
+}
 
 match
 gfc_match_omp_ordered_depend (void)
diff --git a/gcc/fortran/parse.c b/gcc/fortran/parse.c
index 24cc9bf..d004732 100644
--- a/gcc/fortran/parse.c
+++ b/gcc/fortran/parse.c
@@ -1005,6 +1005,9 @@ decode_omp_directive (void)
 	      ST_OMP_MASTER_TASKLOOP);
       matcho ("master", gfc_match_omp_master, ST_OMP_MASTER);
       break;
+    case 'n':
+      matcho ("nothing", gfc_match_omp_nothing, ST_NONE);
+      break;
     case 'l':
       matcho ("loop", gfc_match_omp_loop, ST_OMP_LOOP);
       break;