我经常听到有人说,在编译C和c++程序时,我应该“总是启用编译器警告”。为什么这是必要的?我怎么做呢?

有时我也听到我应该“把警告当作错误”。我应该吗?我怎么做呢?


当前回答

其他的回答都很好,我不想重复他们说过的话。

One other aspect to "why enable warnings" that hasn't properly been touched on is that they help enormously with code maintenance. When you write a program of significant size, it becomes impossible to keep the whole thing in your head at once. You typically have a function or three that you're actively writing and thinking about, and perhaps a file or three on your screen that you can refer to, but the bulk of the program exists in the background somewhere and you have to trust that it keeps working.

如果你改变的某些东西给你看不见的东西带来了麻烦,你就会提醒自己。

例如Clang警告-Wswitch-enum。如果您在枚举上使用开关而漏掉了一个可能的枚举值,则会触发警告。您可能认为这是一个不太可能犯的错误:在编写switch语句时,您可能至少查看了枚举值列表。您甚至可能有一个IDE为您生成开关选项,不为人为错误留下任何空间。

六个月后,当您向枚举中添加另一个可能的条目时,这个警告才真正发挥作用。同样,如果您正在考虑所讨论的代码,那么您可能不会有问题。但是如果这个枚举用于多个不同的目的,并且它是用于您需要额外选项的其中一个目的,那么很容易忘记更新您六个月没有接触过的文件中的开关。

You can think of warnings in the same way as you'd think of automated test cases: they help you make sure that the code is sensible and doing what you need when you first write it, but they help even more to make sure that it keeps doing what you need while you prod at it. The difference is that test cases work very narrowly to the requirements of your code and you have to write them, while warnings work broadly to sensible standards for almost all code, and they're very generously supplied by the boffins who make the compilers.

其他回答

别着急:你不必这么做,也没有必要。-Wall和-Werror是由代码重构狂人为自己设计的:它是由编译器开发人员发明的,目的是避免在用户端编译器或编程语言更新后破坏现有的构建。特性本身并不是什么,而是关于是否破坏构建的决定。

使用与否完全取决于您的喜好。我一直在用它,因为它能帮我改正错误。

其他的回答都很好,我不想重复他们说过的话。

One other aspect to "why enable warnings" that hasn't properly been touched on is that they help enormously with code maintenance. When you write a program of significant size, it becomes impossible to keep the whole thing in your head at once. You typically have a function or three that you're actively writing and thinking about, and perhaps a file or three on your screen that you can refer to, but the bulk of the program exists in the background somewhere and you have to trust that it keeps working.

如果你改变的某些东西给你看不见的东西带来了麻烦,你就会提醒自己。

例如Clang警告-Wswitch-enum。如果您在枚举上使用开关而漏掉了一个可能的枚举值,则会触发警告。您可能认为这是一个不太可能犯的错误:在编写switch语句时,您可能至少查看了枚举值列表。您甚至可能有一个IDE为您生成开关选项,不为人为错误留下任何空间。

六个月后,当您向枚举中添加另一个可能的条目时,这个警告才真正发挥作用。同样,如果您正在考虑所讨论的代码,那么您可能不会有问题。但是如果这个枚举用于多个不同的目的,并且它是用于您需要额外选项的其中一个目的,那么很容易忘记更新您六个月没有接触过的文件中的开关。

You can think of warnings in the same way as you'd think of automated test cases: they help you make sure that the code is sensible and doing what you need when you first write it, but they help even more to make sure that it keeps doing what you need while you prod at it. The difference is that test cases work very narrowly to the requirements of your code and you have to write them, while warnings work broadly to sensible standards for almost all code, and they're very generously supplied by the boffins who make the compilers.

一些警告可能意味着代码中可能出现语义错误或可能出现UB。例如;if()之后,一个未使用的变量,一个被局部变量掩盖的全局变量,或者有符号和无符号的比较。许多警告与编译器中的静态代码分析器或在编译时检测到的违反ISO标准有关,这“需要诊断”。虽然在特定情况下,这些事件可能是合法的,但大多数情况下,它们是设计问题的结果。

一些编译器,例如GCC,有一个命令行选项来激活“警告为错误”模式。这是一个很好的工具,如果残酷,教育新手。

由于某些原因,c++中的编译器警告非常有用。

它可以告诉你,你可能在哪里犯了一个错误,这可能会影响你的操作的最终结果。例如,如果你没有初始化一个变量,或者如果你使用“=”而不是“==”(这只是例子) 它还允许向你展示你的代码不符合c++标准的地方。这很有用,因为如果代码符合实际标准,那么将很容易将代码移到其他平台。

一般来说,警告是非常有用的,可以告诉您代码中哪里有错误,这些错误可能会影响算法的结果,或者在用户使用您的程序时防止出现某些错误。

处理警告不仅能写出更好的代码,还能让你成为更好的程序员。警告会告诉你一些今天对你来说微不足道的事情,但总有一天坏习惯会回来咬你的头。

使用正确的类型,返回该值,计算该返回值。花点时间思考“在这种情况下,这真的是正确的类型吗?”“我需要把这个还回去吗?”最重要的是;“这个代码在未来10年里还能移植吗?”

首先要养成编写无警告代码的习惯。