是否有一个gcc标志赶上整数截断？ [英] Is there a gcc flag to catch integer truncation?

问题描述

有一个 GCC 标志信号警告/错误，当我试图把一个双击值成 INT 变量？我目前有 -Wall -Wextra -Werror 设置，但我还是当我（例如）通过没有得到警告说，双击到 INT 参数，即使我失去的信息。

Is there a gcc flag to signal a warning/error when I try to put a double value into an int variable? I currently have -Wall -Wextra -Werror set but I still don't get warned when I (for instance) pass a double to an int parameter, even though I'm losing information.

推荐答案

您可以使用的 -Wconversion 选项。从GCC手册的（重点煤矿）的：

对于警告可能改变的值隐式转换。 这包括
  实数和整数，之间的转换像ABS（X）当x为双;
  之间的转换符号和无符号，就像usigned UI = -1;和
  转换到更小的类型，如sqrtf（M_PI）。不要为警告
  显式转换像ABS（（int）的x）和UI =（无符号）-1，或者如果
  值不被转换象在无水（2.0）的变化。警告
  约之间的转换符号和无符号整数，可以被禁用
  通过使用-Wno符号转换。

Warn for implicit conversions that may alter a value. This includes conversions between real and integer, like abs (x) when x is double; conversions between signed and unsigned, like unsigned ui = -1; and conversions to smaller types, like sqrtf (M_PI). Do not warn for explicit casts like abs ((int) x) and ui = (unsigned) -1, or if the value is not changed by the conversion like in abs (2.0). Warnings about conversions between signed and unsigned integers can be disabled by using -Wno-sign-conversion.

这是uptill GCC 4.8.2的状态，而从GCC 4.9.0，也可以使用的 -Wfloat转换 以相同的。

This is the state uptill GCC 4.8.2, while from GCC 4.9.0 you may also use -Wfloat-conversion for the same.

这篇关于是否有一个gcc标志赶上整数截断？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！