[gcc r12-1284] openmp: Fix ICE on depend(source) clause during cdtor cloning [PR100957]

[Jakub Jelinek]

https://gcc.gnu.org/g:8b4641033ab6901c18f68b98843f1038a9a52e03

commit r12-1284-g8b4641033ab6901c18f68b98843f1038a9a52e03
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Jun 8 11:16:41 2021 +0200

    openmp: Fix ICE on depend(source) clause during cdtor cloning [PR100957]
    
    The depend(source) clause has NULL OMP_CLAUSE_DECL, it has just the
    depend kind specified and no arguments.  So copy_tree_body_r shouldn't
    check TREE_CODE on it without checking it is non-NULL.
    
    2021-06-08  Jakub Jelinek  <jakub@redhat.com>
    
            PR c++/100957
            * tree-inline.c (copy_tree_body_r): For OMP_CLAUSE_DEPEND don't
            check TREE_CODE if OMP_CLAUSE_DECL is NULL.
    
            * g++.dg/gomp/doacross-2.C: New test.

Diff:
---
 gcc/testsuite/g++.dg/gomp/doacross-2.C | 16 ++++++++++++++++
 gcc/tree-inline.c                      |  3 ++-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/gcc/testsuite/g++.dg/gomp/doacross-2.C b/gcc/testsuite/g++.dg/gomp/doacross-2.C
new file mode 100644
index 00000000000..1fd63570f4a
--- /dev/null
+++ b/gcc/testsuite/g++.dg/gomp/doacross-2.C
@@ -0,0 +1,16 @@
+// PR c++/100957
+// { dg-do compile }
+
+struct S {
+  S ()
+  {
+  #pragma omp for ordered(2)
+    for (int i = 0; i < 32; ++i)
+      for (int j = 0; j < 32; ++j)
+	{
+	#pragma omp ordered depend(source)
+	  ;
+	#pragma omp ordered depend(sink: i - 1, j - 1)
+	}
+  }
+};
diff --git a/gcc/tree-inline.c b/gcc/tree-inline.c
index 4250fd86487..9eb08d23320 100644
--- a/gcc/tree-inline.c
+++ b/gcc/tree-inline.c
@@ -1458,7 +1458,8 @@ copy_tree_body_r (tree *tp, int *walk_subtrees, void *data)
 		   || OMP_CLAUSE_CODE (*tp) == OMP_CLAUSE_DEPEND))
 	{
 	  tree t = OMP_CLAUSE_DECL (*tp);
-	  if (TREE_CODE (t) == TREE_LIST
+	  if (t
+	      && TREE_CODE (t) == TREE_LIST
 	      && TREE_PURPOSE (t)
 	      && TREE_CODE (TREE_PURPOSE (t)) == TREE_VEC)
 	    {