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您好，我想请问这个gdb怎么用啊？为什么我打了那么break一点效果也没用，我已经把所有的优化选项都关闭了啊。。这很奇怪啊。。我一按n就卡死，多按两下程序就执行了。。很不正常，程序是fortran的。。。
