Make cargo check work in the top directory

left/Cargo.toml

@@ -9,7 +9,7 @@ edition = "2021"
 path = "../lib"
 package = "tangentbord1-lib"
 
-[dependencies]
+[target.thumbv6m-none-eabi.dependencies]
 cortex-m-rt = "0.7"
 embassy-rp = { version = "0.1.0", features = ["time-driver", "critical-section-impl"] }
 embassy-executor = { version = "0.5.0", features = ["nightly", "executor-thread", "integrated-timers", "arch-cortex-m"] }

left/src/main.rs

@@ -1,9 +1,10 @@
 //! Firmware for Tangentbord1, left half.
 
-#![no_std]
+// NOTE: the order of attributes matters here..
 #![no_main]
+#![cfg(target_os = "none")] // only try to compile this for embedded
+#![no_std]
 #![feature(type_alias_impl_trait)]
-#![cfg(target_arch = "arm")]
 
 extern crate alloc;
 extern crate cortex_m_rt;