Portability of #warning preprocessor directive

Question

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 t

Answer 1

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.

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