improve smallest compile option for clang
improve smallest compile option for clang

tboox/xmake,tboox/xmake,waruqi/xmake,tboox/xmake,waruqi/xmake,waruqi/xmake,waruqi/xmake,tboox/xmake,waruqi/xmake,tboox/xmake,waruqi/xmake,tboox/xmake,waruqi/xmake,tboox/xmake