如何找出C ++警告的数量 [英] How to find out the number of a C++ warning

问题描述

我已在代码中打开 -Wall 来摆脱所有警告。但是有些我想在代码中允许，所以我在代码中禁用了那些。在常见的警告中，我可以轻松地在Google中找到警告编号并将其禁用，例如：

I have turned on -Wall in my code to get rid of all warnings. Some however I want to allow within the code, so I disable those ones in code. Of the common ones, I can easily find out the warning number in Google and disable them like e.g.:

#pragma warning( disable : 4127 )

但是有些我找不到对应的数字。例如，我要禁用a：

But of some, I can't possibly find the corresponding number. For example, I want to disable a:

warning：数组下标的类型为'char'[-Wchar-subscripts]

如何找到其编号？有可搜索的列表吗？ Microsoft文档不可搜索

How do I find its number? Is there a searchable list? The Microsoft documentation isn't searchable on keyword, only on number.

推荐答案

您没有使用Microsoft编译器，或者至少没有使用Microsoft编译器前端。该警告由Clang前端打印。 （GCC发出了非常类似的警告，也称为 -Wchar-subscripts ，但消息的措词略有不同。）

You are not using a Microsoft compiler, or at least not a Microsoft compiler front end. The warning is printed by the Clang front end. (GCC has a very similar warning, also called -Wchar-subscripts, but the wording of the message is slightly different.)

Clang和GCC不使用数字作为警告，而是使用名称。您可以使用以下编译指示禁用诊断：

Clang and GCC do not use numbers for warnings, but names. You can use these pragmata to disable the diagnostic:

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wchar-subscripts"

随后将在没有警告的情况下进行编译的代码，您可以恢复警告的先前状态（通常启用）：

The code which should be compiled without the warning follows, and with this, you can restore the previous state of the warning (typically enabled):

#pragma GCC diagnostic pop

请注意它说 GCC ，因为该实用程序实际上适用于GCC和Clang。

Note that it says "GCC" because the pragma actually works with GCC and Clang.

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