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编译优化问题, 各代表什么意思? 一般选用哪级?
不同的优化等级代表 编译器采用不同的程序优化方式
优化等级越高，越能减少代码量，但同时造成编译出错的可能性更高
一般建议选择None，能降低报错风险
具体不同等级优化细节，可见如下链接
http://downloads.ti.com/docs/esd/SPRU514/index.html#SPRU514J_HTML/optimizing_your_code.html#3_Optimizing_Your_Code%3FTocPath%3D3%2520Optimizing%2520Your%2520Code%7C_____0
谢谢,很有参考价值
