TIClang's '-Werror' compiler flag maps onto two separate build-options - one that is of string-list type (which is meant to handle the flag with an argument, e.g. '-Werror=type') and one that is of a boolean type (meant to handle just '-Werror' without argument). CCS currently always maps this flag onto the string-list type option, so it is currently impossible to just enable the '-Werror' boolean flag in a .projectspec.