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Don Gagne authored
This removes a race condition between both qwt and qt against math.h on windows with _USE_MATH_DEFINES set. If math.h comes after qwt or qt math headers the math defines will be redefined. Really nasty to track down and ordering problems. So instead I just removed using math defines on windows and fall back to asin definition of M_PI_2. This will have some slight perf impact since it calls function instead of using constant. But I doubt on any of today’s machine it really makes a difference.
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