在产生NaN浮点数时停止调试器 [英] Stopping the debugger when a NaN floating point number is produced

问题描述

我有一个C ++程序。在程序中的某处（难以再现，但可再现），一个caclculation导致浮点beeing设置为NaN。因为涉及NaN的浮点运算产生一个NaN，所以它的传播速度很快。

I have an C++ program. Somewhere in the program (hard to reproduce, but reproduceable) a caclculation results in a float beeing set to a NaN. Since a floating point operation involving a NaN results in a NaN, this spreads fast.

有任何方法可以设置编译器（gcc 4.4）或调试器）在浮点运算导致NaN时停止？这将是非常有用的。

Is there any way I can setup the compiler (gcc 4.4) or the debuger (gdb) to stop when a floating point operation results in a NaN? That would be extremely useful.

谢谢！
Nathan

Thanks! Nathan

PS：可能有问题：我在ubuntu linux 10.10下工作。

PS: It might matter: I am working under ubuntu linux 10.10.

推荐答案

您可以启用浮点异常 - 请参阅 glibc控制函数 - 那么当您的 NaN 价值产生时，您会得到 SIGFPE

You could enable floating point exceptions - see glibc Control Functions - then you'll get a SIGFPE when your NaN value is produced

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