Pass flycheck extra args when running build scripts

crates/project-model/src/build_scripts.rs

@@ -67,6 +67,7 @@ impl WorkspaceBuildScripts {
                 let mut cmd = Command::new(toolchain::cargo());
 
                 cmd.args(["check", "--quiet", "--workspace", "--message-format=json"]);
+                cmd.args(&config.extra_args);
 
                 // --all-targets includes tests, benches and examples in addition to the
                 // default lib and bins. This is an independent concept from the --target

crates/project-model/src/cargo_workspace.rs

@@ -105,6 +105,8 @@ pub struct CargoConfig {
     pub wrap_rustc_in_build_scripts: bool,
     /// The command to run instead of `cargo check` for building build scripts.
     pub run_build_script_command: Option<Vec<String>>,
+    /// Extra args to pass to the cargo command.
+    pub extra_args: Vec<String>,
     /// Extra env vars to set when invoking the cargo command
     pub extra_env: FxHashMap<String, String>,
     pub invocation_strategy: InvocationStrategy,

crates/rust-analyzer/src/config.rs

@@ -1157,6 +1157,7 @@ impl Config {
                 InvocationLocation::Workspace => project_model::InvocationLocation::Workspace,
             },
             run_build_script_command: self.data.cargo_buildScripts_overrideCommand.clone(),
+            extra_args: self.data.check_extraArgs.clone(),
             extra_env: self.data.cargo_extraEnv.clone(),
         }
     }