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Asked: 2026-06-17T06:35:41+00:00

I was compiling a C++ program that makes use of the C++ keyword override.

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I was compiling a C++ program that makes use of the C++ keyword “override”.

I compiled it successfully in Visual Studio 2010, but now I need to compile it on g++. Only g++ 4.6 is available (and you need g++ 4.7 to support “override”).

The real solution is to install g++ 4.7 (which is happening now), but it got me thinking. Is there a compile-time check to see if a keyword is supported?

I tried:

#ifndef override
    #define override
    #ifdef BUILD_WINDOWS
        #pragma message("The \"override\" keyword is not supported on this compiler!  Ignoring it!")
    #else
        #warning "The \"override\" keyword is not supported on this compiler!  Ignoring it!"
    #endif
#endif

This doesn’t work, since “override” is not a symbol.

I would like something more general than simply checking the compiler version to see if it is one of the ones that supports the keyword. How can this be done, if at all?

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1 Answer

  1. Editorial Team

    I know of no way to check for specific keywords from within the program. The best I can offer is checking special predefined macros for specific compilers / compiler versions or language / language versions.

    For the former, there is

    #if defined __GNUC__ && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))

    For the latter, there is

    #if __cplusplus >= 201103L
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