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IOKit: fabs() prototype missing, yet it complies...

Once again I seem to be going crazy.... :) If I put the line:

double x = fabs (3.4);

in a skeleton test kext it compiles and links (did not try kextload).
Yet I cannot find the function prototype anywhere: I searched the entire
kernel.framework and its not there! (Actually I searched the entire
Frameworks dir, and fabs is only in some Carbon header). But if I change
the line to:

double x = fabs (3.4, 5.6);

I get the error "too many args to fn 'double fabs(double)'". So it knows
the correct prototype somehow. I am only #including IOService.h.

How can this be? If fabs() is unavailable (which I suspect) then surely
there should be an error.

Thanks!
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References: 
 >Re: missing IOLog (From: Ed Wynne <email@hidden>)



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