xcode 项目 was compiled with optimization -stepping may behave oddly ;variable may not be available
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遇到问题：在xcode中，debug无法单步调试，单步运行执行步骤不按照语句顺序来。且无法查看到局部变量的值。
控制台显示：项目was compiled with optimization -stepping may behave oddly ;variable may not be available 
分析：有地方设置来编译选项为-ON N=1，2，3。。。
解决：
1.查看是否为debug模式 
2.项目的优化级别设置 
3.有无额外的编译c++ flag
本文遇到的问题就是第三种情况，多写了个-O2
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