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Asked: 2026-05-24T17:14:18+00:00

I noticed that in MacOS X (Lion), the macro __unix__ is not defined. Since

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I noticed that in MacOS X (Lion), the macro __unix__ is not defined.
Since MacOS has its roots in BSD UNIX, shouldn’t that be the case?

Is it possible to let the compiler/preprocessor know that I want it to be considered a UNIX system?

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1 Answer

  1. Editorial Team

    The predefined macros site suggests using:

    #if defined(unix) || defined(__unix__) || defined(__unix)
# define PREDEF_PLATFORM_UNIX
#endif

    To distinguish UNIX systems. They also have warning notes about a number of compilers that don’t set any of these. Depending on why you care about what the platform is you might be better off looking at configure time (in configure.ac or whatever build system you’re using).

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