Retain cfg-attributes on resources

examples/t-cfg-resources.rs

@@ -0,0 +1,40 @@
+//! [compile-pass] check that `#[cfg]` attributes applied on resources work
+//!
+#![no_main]
+#![no_std]
+
+use panic_halt as _;
+
+#[cfg(rustc_is_nightly)]
+mod example {
+
+    #[rtfm::app(device = lm3s6965)]
+    const APP: () = {
+        struct Resources {
+            // A resource
+            #[init(0)]
+            shared: u32,
+
+            // A conditionally compiled resource behind feature_x
+            #[cfg(feature = "feature_x")]
+            x: u32,
+
+            dummy: (),
+        }
+
+        #[init]
+        fn init(_: init::Context) -> init::LateResources {
+            init::LateResources {
+                // The feature needs to be applied everywhere x is defined or used
+                #[cfg(feature = "feature_x")]
+                x: 0,
+                dummy: () // dummy such that we have at least one late resource
+            }
+        }
+
+        #[idle]
+        fn idle(_cx: idle::Context) -> ! {
+            loop {}
+        }
+    };
+}