ci: do not tolerate rustc warnings in any job

Previously, only the clippy job was denying warnings. We have many other CI jobs that compile our library in all sorts of configurations. All of them should be free of warnings.

Pull-Request: #4384.

.cargo/config.toml

@@ -1,3 +1,3 @@
 [alias]
 # Temporary solution to have clippy config in a single place until https://github.com/rust-lang/rust-clippy/blob/master/doc/roadmap-2021.md#lintstoml-configuration is shipped.
-custom-clippy = "clippy --workspace --all-features --all-targets -- -A clippy::type_complexity -A clippy::pedantic -W clippy::used_underscore_binding -W unreachable_pub -D warnings"
+custom-clippy = "clippy --workspace --all-features --all-targets -- -A clippy::type_complexity -A clippy::pedantic -W clippy::used_underscore_binding -W unreachable_pub"

.github/workflows/ci.yml

@@ -12,6 +12,7 @@ concurrency:
 
 env:
   SEGMENT_DOWNLOAD_TIMEOUT_MINS: 2 # Fail cache download after 2 minutes.
+  RUSTFLAGS: '-Dwarnings' # Never tolerate warnings.
 
 jobs:
   test:

identity/src/error.rs

@@ -77,11 +77,7 @@ impl DecodingError {
         }
     }
 
-    #[cfg(any(
-        all(feature = "rsa", not(target_arch = "wasm32")),
-        feature = "secp256k1",
-        feature = "ecdsa"
-    ))]
+    #[cfg(all(feature = "rsa", not(target_arch = "wasm32")))]
     pub(crate) fn encoding_unsupported(key_type: &'static str) -> Self {
         Self {
             msg: format!("encoding {key_type} key to Protobuf is unsupported"),
@@ -111,15 +107,15 @@ pub struct SigningError {
 
 /// An error during encoding of key material.
 impl SigningError {
-    #[cfg(any(feature = "secp256k1", feature = "rsa"))]
+    #[cfg(all(feature = "rsa", not(target_arch = "wasm32")))]
     pub(crate) fn new<S: ToString>(msg: S) -> Self {
         Self {
             msg: msg.to_string(),
             source: None,
         }
     }
 
-    #[cfg(feature = "rsa")]
+    #[cfg(all(feature = "rsa", not(target_arch = "wasm32")))]
     pub(crate) fn source(self, source: impl Error + Send + Sync + 'static) -> Self {
         Self {
             source: Some(Box::new(source)),

transports/webrtc/src/lib.rs

@@ -83,6 +83,7 @@
 mod proto {
     #![allow(unreachable_pub)]
     include!("generated/mod.rs");
+    #[cfg(feature = "tokio")]
     pub(crate) use self::webrtc::pb::{mod_Message::Flag, Message};
 }