#warning预处理器指令的可移植性 [英] Portability of #warning preprocessor directive

问题描述

我知道#warning指令不是标准的 C / C ++，但是几个编译器支持它，包括gcc / g ++。但对于那些不支持它，他们会默默忽略它，否则会导致编译失败？换句话说，我可以安全地在我的项目中使用它，而不破坏不支持它的编译器的构建。

I know that the #warning directive is not standard C/C++, but several compilers support it, including gcc/g++. But for those that don't support it, will they silently ignore it or will it result in a compile failure? In other words, can I safely use it in my project without breaking the build for compilers that don't support it?

推荐答案

很可能，如果编译器不支持#warning，那么它会发出错误。与#pragma不同，没有建议预处理器忽略它不能理解的指令。

It is likely that if a compiler doesn't support #warning, then it will issue an error. Unlike #pragma, there is no recommendation that the preprocessor ignore directives it doesn't understand.

我已经使用了编译器在各种不同的平台，他们都支持#warning。

Having said that, I've used compilers on various different (reasonably common) platforms and they have all supported #warning.

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