feat: added extraCargoArgs argument to RustBuilder (#20)

example/flutter_package/hook/build.dart

@@ -11,6 +11,7 @@ void main(List<String> args) async {
         package: 'flutter_package',
         cratePath: 'rust',
         buildConfig: buildConfig,
+        extraCargoArgs: ['--features=sum'],
       );
       await builder.run(output: output);
     });

example/flutter_package/rust/Cargo.toml

@@ -6,6 +6,9 @@ edition = "2021"
 [lib]
 crate-type = ["cdylib"]
 
+[features]
+sum=[]
+
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]

example/flutter_package/rust/src/lib.rs

@@ -1,12 +1,11 @@
-use std::usize;
-
+#[cfg(feature = "sum")]
 #[no_mangle]
 pub extern "C" fn sum(a: usize, b: usize) -> usize {
     println!("Hello from rust {a} + {b}");
     a + b
 }
 
-#[cfg(test)]
+#[cfg(all(test, feature = "sum"))]
 mod tests {
     use super::*;
 

native_toolchain_rust/lib/src/builder.dart

@@ -107,6 +107,7 @@ class RustBuilder {
     this.toolchain,
     required this.cratePath,
     required this.buildConfig,
+    this.extraCargoArgs = const [],
     this.release = true,
     this.assetName,
     this.useNativeManifest = true,
@@ -140,6 +141,9 @@ class RustBuilder {
   /// dependencies. Default value adds `hook/build.dart` as dependency.
   final List<String> dartBuildFiles;
 
+  /// Extra arguments to pass to `cargo build`.
+  final List<String> extraCargoArgs;
+
   /// Whether to build in release mode. Default is `true` even for debug builds.
   final bool release;
 
@@ -209,6 +213,7 @@ class RustBuilder {
           target.triple,
           '--target-dir',
           outDir.toFilePath(),
+          ...extraCargoArgs,
         ],
         environment: await _buildEnvironment(
           outDir,