SET(EXTRA_CFLAGS "${EXTRA_CFLAGS} -Wall -Werror -fvisibility=hidden")
SET(EXTRA_CXXFLAGS "${EXTRA_CXXFLAGS} -Wall -Werror -fvisibility=hidden -fvisibility-inlines-hidden")
SET(EXTRA_CFLAGS "${EXTRA_CFLAGS} -Wall -Werror -fvisibility=hidden")
SET(EXTRA_CXXFLAGS "${EXTRA_CXXFLAGS} -Wall -Werror -fvisibility=hidden -fvisibility-inlines-hidden")