Fix child-process arg warning

scripts/build-macos-helper.sh

@@ -7,21 +7,48 @@ SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 SWIFT_SOURCE="$SCRIPT_DIR/get-mpv-window-macos.swift"
 OUTPUT_DIR="$SCRIPT_DIR/../dist/scripts"
 OUTPUT_BINARY="$OUTPUT_DIR/get-mpv-window-macos"
+OUTPUT_SOURCE_COPY="$OUTPUT_DIR/get-mpv-window-macos.swift"
+
+fallback_to_source() {
+  echo "Falling back to source fallback: $OUTPUT_SOURCE_COPY"
+  mkdir -p "$OUTPUT_DIR"
+  cp "$SWIFT_SOURCE" "$OUTPUT_SOURCE_COPY"
+}
+
+build_swift_helper() {
+  echo "Compiling macOS window tracking helper..."
+  if ! command -v swiftc >/dev/null 2>&1; then
+    echo "swiftc not found in PATH; skipping compilation."
+    return 1
+  fi
+
+  if ! swiftc -O "$SWIFT_SOURCE" -o "$OUTPUT_BINARY"; then
+    return 1
+  fi
+
+  chmod +x "$OUTPUT_BINARY"
+  echo "✓ Built $OUTPUT_BINARY"
+  return 0
+}
+
+# Optional skip flag for non-macOS CI/dev environments
+if [[ "${SUBMINER_SKIP_MACOS_HELPER_BUILD:-}" == "1" ]]; then
+  echo "Skipping macOS helper build (SUBMINER_SKIP_MACOS_HELPER_BUILD=1)"
+  fallback_to_source
+  exit 0
+fi
 
 # Only build on macOS
 if [[ "$(uname)" != "Darwin" ]]; then
   echo "Skipping macOS helper build (not on macOS)"
+  fallback_to_source
   exit 0
 fi
 
 # Create output directory
 mkdir -p "$OUTPUT_DIR"
 
-# Compile Swift script to binary
-echo "Compiling macOS window tracking helper..."
-swiftc -O "$SWIFT_SOURCE" -o "$OUTPUT_BINARY"
-
-# Make executable
-chmod +x "$OUTPUT_BINARY"
-
-echo "✓ Built $OUTPUT_BINARY"
+# Compile Swift script to binary, fallback to source if unavailable or compilation fails
+if ! build_swift_helper; then
+  fallback_to_source
+fi