[M] update build script for clean and verbose options

build.sh

@@ -1,9 +1,34 @@
 #!/bin/bash
 
+EXT_CMD=""
+CLEAN_FLAG=false
+
+for i in "$@"; do
+  case $i in
+    -v|--verbose)
+      EXT_CMD="VERBOSE=1"
+      shift
+      ;;
+    -c|--clean)
+      CLEAN_FLAG=true
+      shift
+      ;;
+    -*|--*)
+      echo "Unknown option $i"
+      exit 1
+      ;;
+    *)
+      ;;
+  esac
+done
+
 mkdir -p build
 cd build
 
 cmake ..
 
-make clean
-make -j`nproc` $1
+if [ "$CLEAN_FLAG" = true ]; then
+    make clean
+fi
+
+make -j`nproc` $EXT_CMD