Check for casts to an incomplete type in C. Improves diagnostics for cast to
incomplete union (PR5692) and incomplete enum, and fixes obscure
accepts-invalid on cast to incomplete struct.
llvm-svn: 108630
diff --git a/clang/test/Sema/cast-incomplete.c b/clang/test/Sema/cast-incomplete.c
new file mode 100644
index 0000000..dd10e00
--- /dev/null
+++ b/clang/test/Sema/cast-incomplete.c
@@ -0,0 +1,14 @@
+// RUN: %clang_cc1 -fsyntax-only %s -verify
+// PR5692
+
+enum x; // expected-note {{forward declaration}}
+extern struct y a; // expected-note {{forward declaration}}
+extern union z b; // expected-note 2 {{forward declaration}}
+
+void foo() {
+ (enum x)1; // expected-error {{cast to incomplete type}}
+ (struct y)a; // expected-error {{cast to incomplete type}}
+ (union z)b; // expected-error {{cast to incomplete type}}
+ (union z)1; // expected-error {{cast to incomplete type}}
+}
+