• Don Gagne's avatar
    Fix macro redefinition errors · 96fd7a03
    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.
    96fd7a03
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