typesafe_cb: fix promotable types being incorrectly accepted by cast_if_type.

[ccan] / ccan / typesafe_cb / test / compile_fail-cast_if_type-promotable.c

diff --git a/ccan/typesafe_cb/test/compile_fail-cast_if_type-promotable.c b/ccan/typesafe_cb/test/compile_fail-cast_if_type-promotable.c
new file mode 100644 (file)
index 0000000..a036248
--- /dev/null
+++ b/ccan/typesafe_cb/test/compile_fail-cast_if_type-promotable.c
@@ -0,0 +1,23 @@
+#include <ccan/typesafe_cb/typesafe_cb.h>
+#include <stdbool.h>
+
+static void _set_some_value(void *val)
+{
+}
+
+#define set_some_value(expr)                                           \
+       _set_some_value(cast_if_type(void *, (expr), (expr), int))
+
+int main(int argc, char *argv[])
+{
+#ifdef FAIL
+       bool x = 0;
+#if !HAVE_TYPEOF||!HAVE_BUILTIN_CHOOSE_EXPR||!HAVE_BUILTIN_TYPES_COMPATIBLE_P
+#error "Unfortunately we don't fail if cast_if_type is a noop."
+#endif
+#else
+       int x = 0;
+#endif
+       set_some_value(x);
+       return 0;
+}