Fix cargo run uniffi-bindgen when cross compiling (#2476)

Fixes #2461

src/module_writer.rs

@@ -1053,14 +1053,18 @@ fn uniffi_bindgen_command(crate_dir: &Path) -> Result<Command> {
 
     let command = if has_uniffi_bindgen_target {
         let mut command = Command::new("cargo");
-        command.args(["run", "--bin", "uniffi-bindgen", "--manifest-path"]);
-        command.arg(manifest_path);
-        command.current_dir(crate_dir);
+        command
+            .args(["run", "--bin", "uniffi-bindgen", "--manifest-path"])
+            .arg(manifest_path)
+            .current_dir(crate_dir)
+            .env_remove("CARGO_BUILD_TARGET");
         command
     } else if has_uniffi_bindgen_workspace_package {
         let mut command = Command::new("cargo");
-        command.args(["run", "--bin", "uniffi-bindgen"]);
-        command.current_dir(cargo_metadata.workspace_root);
+        command
+            .args(["run", "--bin", "uniffi-bindgen"])
+            .current_dir(cargo_metadata.workspace_root)
+            .env_remove("CARGO_BUILD_TARGET");
         command
     } else {
         let mut command = Command::new("uniffi-bindgen");

tests/common/mod.rs

@@ -85,6 +85,7 @@ pub fn maybe_mock_cargo() {
 }
 
 /// Better error formatting
+#[track_caller]
 pub fn handle_result<T>(result: Result<T>) -> T {
     match result {
         Err(e) => {
@@ -199,6 +200,14 @@ pub fn create_conda_env(name: &str, major: usize, minor: usize) -> Result<(PathB
         .arg("--json")
         .output()
         .expect("Conda not available.");
+    if !output.status.success() {
+        panic!(
+            "Failed to create conda environment: {}\n---stdout:\n{}---stderr:\n{}",
+            output.status,
+            str::from_utf8(&output.stdout)?,
+            str::from_utf8(&output.stderr)?
+        );
+    }
     let result: CondaCreateResult = serde_json::from_slice(&output.stdout)?;
     if !result.success {
         bail!("Failed to create conda environment {}.", name);