gcc optimization

首先，去掉"-O"。既然不用optimization，“－O0”就像“XX脫褲子”，多餘。其次，GCC有好多OPTIMIZATION OPTIONS，如OPTIMIZED FOR CPU，SIZE，CODE。。。建議你在compile .c/.cpp/.C時, catch the line "gcc ....." and then see what options are turned on. If you need to see the details about each option,

$man gcc

or, check

http://gcc.gnu.org/onlinedocs/

Good luck.