Sparse can't do this yet.
So, add a testcase for it.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
---
validation/expand/union-cast.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
create mode 100644 validation/expand/union-cast.c
diff --git a/validation/expand/union-cast.c b/validation/expand/union-cast.c
new file mode 100644
index 000000000000..a28d01f22b92
--- /dev/null
+++ b/validation/expand/union-cast.c
@@ -0,0 +1,27 @@
+union u {
+ int i;
+ struct s {
+ int a;
+ } s;
+};
+
+int foo(void)
+{
+ struct s s = { 3 };
+ union u u = (union u)s;
+ return u.s.a;
+}
+
+/*
+ * check-name: union-cast
+ * check-command: test-linearize -Wno-decl -fdump-ir $file
+ * check-known-to-fail
+ *
+ * check-output-ignore
+ * check-output-excludes: load\\.
+ *
+ * check-error-start
+union-cast.c:11:22: warning: cast to non-scalar
+union-cast.c:11:22: warning: cast from non-scalar
+ * check-error-end
+ */
--
2.24.0
