diff --git a/build_arch.sh b/build_arch.sh
new file mode 100755
index 0000000..277df64
--- /dev/null
+++ b/build_arch.sh
@@ -0,0 +1,85 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+BUILD_SH="${ROOT_DIR}/build.sh"
+
+usage() {
+  cat <<'EOF'
+Usage:
+  ./build_arch.sh <arch> [--le|--be] [-- <extra build.sh args>]
+
+Examples:
+  ./build_arch.sh mips
+  ./build_arch.sh mips.le
+  ./build_arch.sh mips --be
+  ./build_arch.sh riscv64
+  ./build_arch.sh sparc.be -- --skip-fetch -d
+
+Notes:
+  - If <arch> has no endian suffix, default is ".le"
+  - Use "--le" or "--be" to force endianness
+  - Everything after "--" is passed to build.sh
+EOF
+}
+
+if [[ $# -lt 1 ]]; then
+  usage
+  exit 1
+fi
+
+arch="$1"; shift || true
+
+force_endian=""
+extra_args=()
+
+# Parse flags until optional "--"
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --le|--be)
+      force_endian="${1#--}"
+      shift
+      ;;
+    -h|--help)
+      usage
+      exit 0
+      ;;
+    --)
+      shift
+      extra_args+=("$@")
+      break
+      ;;
+    *)
+      # unknown flag -> treat as extra args (or enforce strict if you want)
+      extra_args+=("$1")
+      shift
+      ;;
+  esac
+done
+
+# Normalize arch -> ensure it matches CORES entries like "mips.le", "mips.be", "mips64.le", etc.
+if [[ "$arch" == *.* ]]; then
+  # Already has suffix (e.g. mips.le)
+  normalized="$arch"
+else
+  # No suffix: apply forced endian or default to le
+  if [[ -n "$force_endian" ]]; then
+    normalized="${arch}.${force_endian}"
+  else
+    normalized="${arch}.le"
+  fi
+fi
+
+# If user provided both "mips.le" and "--be", --be wins (optional behavior)
+if [[ -n "$force_endian" ]]; then
+  base="${normalized%%.*}"
+  normalized="${base}.${force_endian}"
+fi
+
+if [[ ! -x "$BUILD_SH" ]]; then
+  echo "Error: build.sh not found or not executable at: $BUILD_SH" >&2
+  exit 1
+fi
+
+exec "$BUILD_SH" --external-lib-arch "$normalized" "${extra_args[@]}"
+