ardupilot/libraries/AP_HAL_SITL/fenv_polyfill.h

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#pragma once
#if (defined __APPLE__) && (defined(__i386__) || defined(__x86_64__))
#include <fenv.h>
// Public domain polyfill for feenableexcept on OS X
// http://www-personal.umich.edu/~williams/archive/computation/fe-handling-example.c
inline int
feenableexcept (unsigned int excepts)
{
static fenv_t fenv;
unsigned int new_excepts = excepts & FE_ALL_EXCEPT,
old_excepts; // previous masks
if ( fegetenv (&fenv) ) return -1;
old_excepts = fenv.__control & FE_ALL_EXCEPT;
// unmask
fenv.__control &= ~new_excepts;
fenv.__mxcsr &= ~(new_excepts << 7);
return ( fesetenv (&fenv) ? -1 : old_excepts );
}
#endif // APPLE