openmp: Fix up finish_omp_target_clauses [PR108286]

The comment in the loop says that we shouldn't add a map clause if such
a clause exists already, but the loop was actually using OMP_CLAUSE_DECL
on any clause.  Target construct can have various clauses which don't
have OMP_CLAUSE_DECL at all (e.g. nowait, device or if) or clause
where it means something different (e.g. privatization clauses, allocate,
depend).

So, only check OMP_CLAUSE_DECL on OMP_CLAUSE_MAP clauses.

2023-01-05  Jakub Jelinek  <jakub@redhat.com>

	PR c++/108286
	* semantics.cc (finish_omp_target_clauses): Ignore clauses other than
	OMP_CLAUSE_MAP.

	* testsuite/libgomp.c++/pr108286.C: New test.

1 files changed, 29 insertions, 0 deletions

diff --git a/libgomp/testsuite/libgomp.c++/pr108286.C b/libgomp/testsuite/libgomp.c++/pr108286.C
new file mode 100644
index 0000000..ee88c2f
--- /dev/null
+++ b/libgomp/testsuite/libgomp.c++/pr108286.C
@@ -0,0 +1,29 @@
+// PR c++/108286
+// { dg-do run }
+
+struct S {
+  int
+  foo ()
+  {
+    int res = 0;
+#pragma omp target map(size, ptr[:size], res) nowait
+    res = ptr[size - 1];
+#pragma omp taskwait
+    return res;
+  }
+
+  unsigned size;
+  int *ptr;
+};
+
+int
+main ()
+{
+  S s;
+  int buf[5];
+  s.size = 5;
+  s.ptr = buf;
+  buf[4] = 42;
+  if (s.foo () != 42)
+    __builtin_abort ();
+}