-Wno-unused-variable 开关通常可以解决问题.但是，如果您关心项目中的这些事情，这确实是一个非常有用的警告.但是，当 GCC 开始警告您代码中没有的内容时，这会很烦人.

The -Wno-unused-variable switch usually does the trick. However, that is a very useful warning indeed if you care about these things in your project. It becomes annoying when GCC starts to warn you about things not in your code though.

我建议您保持警告，但使用 -isystem 而不是 -I 来包含第三方项目的目录.该标志告诉 GCC 不要就您无法控制的内容向您发出警告.

I would recommend you keeping the warning on, but use -isystem instead of -I for include directories of third-party projects. That flag tells GCC not to warn you about the stuff you have no control over.

例如，使用 -isystem C:\boost_1_52_0 而不是 -IC:\boost_1_52_0.

For example, instead of -IC:\boost_1_52_0, say -isystem C:\boost_1_52_0.

希望有帮助.祝你好运！

Hope it helps. Good Luck!