C - How do you ignore certain code depending on the OS (so one source code to fit all) -


i want make source of program cross-platform, , far good. have couple of functions differ in syntax, checking defines @ start see if windows or linux , setting variable 1 or 0 depending on 1 is. thinking if statement check on variable skip incorrect syntax usage. have realised won't compile because compiler still 'sees' offending code. can you 

 #ifdef

to compartmentalize functions , call them within code? suggestions?

you have enclose entire non cross-platform section between #ifdefs.

for instance:

int gettimeofday(struct timeval *tp, void *tzp) { #ifdef win32      struct _timeb timebuffer;      _ftime(&timebuffer);     tp->tv_sec = timebuffer.time;     tp->tv_usec = timebuffer.millitm * 1000;      return 0;  #else      tp->tv_sec = time(null);     tp->tv_usec = 0;      return 0;  #endif }

like compiler won't see offending code since removed @ preprocessing step.


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