Only parse first build argument as path if it does not start with hyphens

src/command/build.rs

@@ -184,7 +184,15 @@ type BuildStep = fn(&mut Build) -> Result<(), Error>;
 
 impl Build {
     /// Construct a build command from the given options.
-    pub fn try_from_opts(build_opts: BuildOptions) -> Result<Self, Error> {
+    pub fn try_from_opts(mut build_opts: BuildOptions) -> Result<Self, Error> {
+        if let Some(path) = &build_opts.path {
+            if path.to_string_lossy().starts_with("--") {
+                let path = build_opts.path.take().unwrap();
+                build_opts
+                    .extra_options
+                    .insert(0, path.to_string_lossy().into_owned().to_string());
+            }
+        }
         let crate_path = get_crate_path(build_opts.path)?;
         let crate_data = manifest::CrateData::new(&crate_path, build_opts.out_name.clone())?;
         let out_dir = crate_path.join(PathBuf::from(build_opts.out_dir));