openmp: Change the way of building of reduction array type

The PR98597 patch regresses on _Atomic-3.c, as in the C FE building an
array type with qualified elements results in a type incompatible with
when an array type with unqualified elements is qualified afterwards.
This patch adds a workaround for that.

2021-01-15  Jakub Jelinek  <jakub@redhat.com>

	* c-typeck.c (c_finish_omp_clauses): For reduction build array with
	unqualified element type and then call c_build_qualified_type on the
	ARRAY_TYPE.

diff --git a/gcc/c/c-typeck.c b/gcc/c/c-typeck.c
index 67c0080a5efcf2b6ca7d1989385959059af4a5e7..083134a6b34ceebb8d8a7605aa4f73ee97a8727a 100644 (file)
--- a/gcc/c/c-typeck.c
+++ b/gcc/c/c-typeck.c
@@ -13979,7 +13979,9 @@ c_finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
              size = size_binop (MINUS_EXPR, size, size_one_node);
              size = save_expr (size);
              tree index_type = build_index_type (size);
-             tree atype = build_array_type (type, index_type);
+             tree atype = build_array_type (TYPE_MAIN_VARIANT (type),
+                                            index_type);
+             atype = c_build_qualified_type (atype, TYPE_QUALS (type));
              tree ptype = build_pointer_type (type);
              if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
                t = build_fold_addr_expr (t);