I think PI should be defined as value M_PI (from #include <math.h>). And *ABI* macros have to stay as macros so they can be used in preprocessing: #if SOMETHING_ABI >= N
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I think PI should be defined as value M_PI (from #include <math.h>). And *ABI* macros have to stay as macros so they can be used in preprocessing:
#if SOMETHING_ABI >= N