-Os Optimize for size. -Os enables all -O2 optimizations that do not
typically increase code size. It also performs further optimiza-
tions designed to reduce code size.
不是什么O1到O3
这里有用STL?string?
-Os Optimize for size. -Os enables all -O2 optimizations that do not
typically increase code size. It also performs further optimiza-
tions designed to reduce code size.
试试呗。