To use tprof for micro-profiling, the application must be linked and compiled with the -g debug flag.
要想使用tprof执行微剖析，应用程序在编译和链接时必须使用—g调试标志。
Sendmail checked that "debug flag" values weren't larger than the legal value, but it didn't check if the number was negative.
sendmail会检查“调试标记”是不是比合法的值大，但是它并没有去检查这个值是不是负数。
Unless you are concerned about security, I recommend leaving the debug flag (-g) on all the time even when compiling for production.
除非您非常关注安全性，否则我建议您保留调试标记(- g)，即使在编译产品时也是如此。
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