Merge pull request #18678 from chrysn-pull-requests/rust-update-20221001

rust: Update dependencies, build and test more on stable

.cargo/config.toml

@@ -5,5 +5,5 @@
 # Cargo.toml, copy this file over, or just use the released versions.
 
 [patch.crates-io]
-riot-sys = { git = "https://github.com/RIOT-OS/rust-riot-sys" }
-riot-wrappers = { git = "https://github.com/RIOT-OS/rust-riot-wrappers" }
+#riot-sys = { git = "https://github.com/RIOT-OS/rust-riot-sys" }
+#riot-wrappers = { git = "https://github.com/RIOT-OS/rust-riot-wrappers" }

examples/rust-gcoap/Cargo.toml

@@ -8,6 +8,16 @@ resolver = "2"
 [lib]
 crate-type = ["staticlib"]
 
+[profile.release]
+# Setting the panic mode has little effect on the built code (as Rust on RIOT
+# supports no unwinding), but setting it allows builds on native without using
+# the nightly-only lang_items feature.
+panic = "abort"
+# This is a typical set of options that helps Rust binaries stay small
+lto = true
+codegen-units = 1
+opt-level = "s"
+
 [dependencies]
 riot-wrappers = { version = "^0.7.18", features = [ "set_panic_handler", "panic_handler_format", "with_coap_message", "with_coap_handler" ] }
 

examples/rust-hello-world/Cargo.toml

@@ -8,6 +8,12 @@ resolver = "2"
 [lib]
 crate-type = ["staticlib"]
 
+[profile.release]
+# Setting the panic mode has little effect on the built code (as Rust on RIOT
+# supports no unwinding), but setting it allows builds on native without using
+# the nightly-only lang_items feature.
+panic = "abort"
+
 [dependencies]
 # `default-features = false` can be removed with 0.8, and enables building on stable during the 0.7 series
 riot-wrappers = { version = "0.7", features = [ "set_panic_handler" ], default-features = false }

tests/rust_libs/Makefile

@@ -5,6 +5,10 @@ USEMODULE += shell_democommands
 
 FEATURES_REQUIRED += rust_target
 
+# Testing on stable to ensure that no nightly features are needed when Rust is
+# pulled in through modules.
+CARGO_CHANNEL = stable
+
 # Currently unknown, something related to the LED_PORT definition that doesn't
 # pass C2Rust's transpilation
 BOARD_BLACKLIST := ek-lm4f120xl

tests/rust_minimal/Makefile

@@ -5,9 +5,8 @@ BASELIBS += $(APPLICATION_RUST_MODULE).module
 
 FEATURES_REQUIRED += rust_target
 
-# This example can, on all platforms, be built with a stable version of Rust.
-# For most advanced features (eg. when using CoAP, SAUL or the shell with
-# Rust), this needs to be set to "nightly" for the time being.
+# Testing on stable to ensure that no nightly features are needed for basic
+# Rust usage.
 CARGO_CHANNEL = stable
 
 # Currently unknown, something related to the LED_PORT definition that doesn't