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Mac OS X version at compile-time

Subject: Mac OS X version at compile-time
From: Peter Lovell <email@hidden>
Date: Wed, 6 Oct 2004 18:23:38 -0400
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Does anyone know of a convenient way to determine at compile-time (C preprocessor time, actually) which version of headers are being used? I know there are macros in "AvailabilityMacros.h" but that's not applicable to the problem I have.

I'm trying to adapt an open-source project for Max OS X. This will then be built by various developers as needed, on varying OSs and versions.

Most of this is OK but I ran into a problem with a change to <sys/socket.h>

In early versions, there is not typedef for "socklen_t". But in OS X 10.2 and later, there is this definition ...

/*
 * Data types.
 */
typedef u_char		sa_family_t;
#ifdef	_BSD_SOCKLEN_T_
typedef	_BSD_SOCKLEN_T_	socklen_t;
#undef	_BSD_SOCKLEN_T_
#endif

So, my code which includes <sys/socket.h> cannot determine whether it is defined or not. I think an easy solution for this would have been to add #define SOCKLEN_T_DEFINED in the block, but that opportunity has passed us by. The only way I can see is to check the version of the headers being used.

So, is there a #define somewhere which I can test?? Or a more appropriate solution?

Thanks.....Peter

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