message: Ensure proper quoting of shell variables
diff: @@ -229,7 +229,7 @@ while [ $# -ne 0 ]; do
  CMakeGenerator="$optarg"
  ;;
  --prefix=*)
  - append_cache_entry CMAKE_INSTALL_PREFIX PATH $optarg
  + append_cache_entry CMAKE_INSTALL_PREFIX PATH "$optarg"
  ;;
  --with-runtime-checks)
  append_cache_entry CAF_ENABLE_RUNTIME_CHECKS BOOL yes
  @@ -300,19 +300,19 @@ while [ $# -ne 0 ]; do
  esac
  ;;
  --with-clang=*)
  - clang=$optarg
  + clang="$optarg"
  ;;
  --with-gcc=*)
  - gcc=$optarg
  + gcc="$optarg"
  ;;
  --with-qt-prefix=*)
  append_cache_entry CAF_QT_PREFIX_PATH STRING "$optarg"
  ;;
  --with-openssl=*)
  - append_cache_entry OPENSSL_ROOT_DIR PATH $optarg
  + append_cache_entry OPENSSL_ROOT_DIR PATH "$optarg"
  ;;
  --build-type=*)
  - append_cache_entry CMAKE_BUILD_TYPE STRING $optarg
  + append_cache_entry CMAKE_BUILD_TYPE STRING "$optarg"
  ;;
  --build-dir=*)
  builddir="$optarg"
  