add a readme and point out incomplete code generation

crates/cpp/tests/README.md

@@ -0,0 +1,12 @@
+
+This folder contains examples on how to use the caninical ABI without
+a wasm32 target.
+
+The `native_strings` folder contains an example of passing strings, with
+the guest in C++ and Rust, the host in C++, and in the w2c folder an
+example of a wasm component transpiled to C and then executed natively.
+
+Sadly the [w2c2](https://github.com/turbolent/w2c2) bridge code generation isn't yet complete.
+
+The `native_resources` folder shows a more complex example using resources,
+both guest and host defined ones. This doesn't include a wasm2c deployment.

crates/cpp/tests/native_strings/w2c2/Makefile

@@ -28,5 +28,9 @@ valgrind:
 w2c2_guest.c: guest_release.wasm
 	$(W2C2_PATH)/build/w2c2/w2c2 $^ $@
 
-the-world_bridge.c: $(WIT_BINDGEN)
-	$(WIT_BINDGEN) bridge ../wit --instance guestrelease --include w2c2_guest.h
+the-world_bridge.c: the-world_bridge_target.c
+	cp $^ $@
+
+# not yet up to the task
+#the-world_bridge.c: $(WIT_BINDGEN)
+#	$(WIT_BINDGEN) bridge ../wit --instance guestrelease --include w2c2_guest.h