c-parser.c (c_parser_oacc_declare): Don't scan for GOMP_MAP_POINTER.

gcc/c/
	* c-parser.c (c_parser_oacc_declare): Don't scan for
	GOMP_MAP_POINTER.
	* c-typeck.c (handle_omp_array_sections): Mark data clauses with
	GOMP_MAP_FORCE_{PRESENT,TO,FROM,TOFROM} as potentially having
	zero-length subarrays.

	gcc/cp/
	* parser.c (cp_parser_oacc_declare): Don't scan for
	GOMP_MAP_POINTER.
	* semantics.c (handle_omp_array_sections): Mark data clauses with
	GOMP_MAP_FORCE_{PRESENT,TO,FROM,TOFROM} as potentially having
	zero-length subarrays.

	gcc/
	* omp-low.c (lower_omp_target): Mark data clauses with
	GOMP_MAP_FORCE_{PRESENT,TO,FROM,TOFROM} as potentially having
	zero-length subarrays.

	libgomp/
	* testsuite/libgomp.oacc-c-c++-common/zero_length_subarrays.c: New
	test.

From-SVN: r238376

gcc/ChangeLog

@@ -1,3 +1,9 @@
+2016-07-15  Cesar Philippidis  <cesar@codesourcery.com>
+
+	* omp-low.c (lower_omp_target): Mark data clauses with
+	GOMP_MAP_FORCE_{PRESENT,TO,FROM,TOFROM} as potentially having
+	zero-length subarrays.
+
 2016-07-15  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/71881

gcc/c/ChangeLog

@@ -1,3 +1,11 @@
+2016-07-15  Cesar Philippidis  <cesar@codesourcery.com>
+
+	* c-parser.c (c_parser_oacc_declare): Don't scan for
+	GOMP_MAP_POINTER.
+	* c-typeck.c (handle_omp_array_sections): Mark data clauses with
+	GOMP_MAP_FORCE_{PRESENT,TO,FROM,TOFROM} as potentially having
+	zero-length subarrays.
+
 2016-07-15  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c/71858

gcc/c/c-parser.c

@@ -13664,11 +13664,6 @@ c_parser_oacc_declare (c_parser *parser)
 	case GOMP_MAP_DEVICE_RESIDENT:
 	  break;
 
-	case GOMP_MAP_POINTER:
-	  /* Generated by c_finish_omp_clauses from array sections;
-	     avoid spurious diagnostics.  */
-	  break;
-
 	case GOMP_MAP_LINK:
 	  if (!global_bindings_p ()
 	      && (TREE_STATIC (decl)

gcc/c/c-typeck.c

@@ -12505,6 +12505,10 @@ handle_omp_array_sections (tree c, enum c_omp_region_type ort)
 	  case GOMP_MAP_ALWAYS_TOFROM:
 	  case GOMP_MAP_RELEASE:
 	  case GOMP_MAP_DELETE:
+	  case GOMP_MAP_FORCE_TO:
+	  case GOMP_MAP_FORCE_FROM:
+	  case GOMP_MAP_FORCE_TOFROM:
+	  case GOMP_MAP_FORCE_PRESENT:
 	    OMP_CLAUSE_MAP_MAYBE_ZERO_LENGTH_ARRAY_SECTION (c) = 1;
 	    break;
 	  default:

gcc/cp/ChangeLog

@@ -1,3 +1,11 @@
+2016-07-15  Cesar Philippidis  <cesar@codesourcery.com>
+
+	* parser.c (cp_parser_oacc_declare): Don't scan for
+	GOMP_MAP_POINTER.
+	* semantics.c (handle_omp_array_sections): Mark data clauses with
+	GOMP_MAP_FORCE_{PRESENT,TO,FROM,TOFROM} as potentially having
+	zero-length subarrays.
+
 2016-07-11  Jason Merrill  <jason@redhat.com>
 
 	* decl.c (store_parm_decls): Remove check for void parm.

gcc/cp/parser.c

@@ -35258,11 +35258,6 @@ cp_parser_oacc_declare (cp_parser *parser, cp_token *pragma_tok)
 	case GOMP_MAP_DEVICE_RESIDENT:
 	  break;
 
-	case GOMP_MAP_POINTER:
-	  /* Generated by c_finish_omp_clauses from array sections;
-	     avoid spurious diagnostics.  */
-	  break;
-
 	case GOMP_MAP_LINK:
 	  if (!global_bindings_p ()
 	      && (TREE_STATIC (decl)

gcc/cp/semantics.c

@@ -5002,6 +5002,10 @@ handle_omp_array_sections (tree c, enum c_omp_region_type ort)
 	      case GOMP_MAP_ALWAYS_TOFROM:
 	      case GOMP_MAP_RELEASE:
 	      case GOMP_MAP_DELETE:
+	      case GOMP_MAP_FORCE_TO:
+	      case GOMP_MAP_FORCE_FROM:
+	      case GOMP_MAP_FORCE_TOFROM:
+	      case GOMP_MAP_FORCE_PRESENT:
 		OMP_CLAUSE_MAP_MAYBE_ZERO_LENGTH_ARRAY_SECTION (c) = 1;
 		break;
 	      default:

gcc/omp-low.c

@@ -16210,6 +16210,10 @@ lower_omp_target (gimple_stmt_iterator *gsi_p, omp_context *ctx)
 		    case GOMP_MAP_ALWAYS_FROM:
 		    case GOMP_MAP_ALWAYS_TOFROM:
 		    case GOMP_MAP_RELEASE:
+		    case GOMP_MAP_FORCE_TO:
+		    case GOMP_MAP_FORCE_FROM:
+		    case GOMP_MAP_FORCE_TOFROM:
+		    case GOMP_MAP_FORCE_PRESENT:
 		      tkind_zero = GOMP_MAP_ZERO_LEN_ARRAY_SECTION;
 		      break;
 		    case GOMP_MAP_DELETE:

libgomp/ChangeLog

@@ -1,3 +1,8 @@
+2016-07-15  Cesar Philippidis  <cesar@codesourcery.com>
+
+	* testsuite/libgomp.oacc-c-c++-common/zero_length_subarrays.c: New
+	test.
+
 2016-07-03  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR middle-end/71734

libgomp/testsuite/libgomp.oacc-c-c++-common/zero_length_subarrays.c

@@ -0,0 +1,45 @@
+/* Exercise zero-length sub-arrays.  */
+
+const int n = 10;
+
+void
+subzero_present (int *a, int n)
+{
+#pragma acc data present (a[0:n])
+  ;
+#pragma acc data pcopy (a[0:n])
+  ;
+#pragma acc data pcopyin (a[0:n])
+  ;
+#pragma acc data pcopyout (a[0:n])
+  ;
+
+}
+
+void
+subzero (int *a, int n)
+{
+#pragma acc data create (a[0:n])
+  ;
+#pragma acc data copy (a[0:n])
+  ;
+#pragma acc data copyin (a[0:n])
+  ;
+#pragma acc data copyout (a[0:n])
+  ;
+}
+
+int
+main ()
+{
+  int a[n];
+
+#pragma acc data copy (a[0:n])
+  {
+    subzero_present (a, 0);
+  }
+
+  subzero (a, 0);
+
+  return 0;
+}