[MacPorts] #66978: LegacySupport messes up isnan with GCC (and isinfinity): error: 'isnan' was not declared in this scope; did you mean 'std::isnan' (was: ImageMagick headers conflict with LegacySupport? magick-type.h: error: 'isnan' was not declared in this scope; did you mean 'std::isnan'?)

[MacPorts]

#66978: LegacySupport messes up isnan with GCC (and isinfinity): error: 'isnan' was
not declared in this scope; did you mean 'std::isnan'
----------------------------+------------------------
  Reporter:  barracuda156   |      Owner:  ryandesign
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.8.1
Resolution:                 |   Keywords:
      Port:  legacysupport  |
----------------------------+------------------------
Changes (by barracuda156):

 * port:  ImageMagick => legacysupport


Comment:

 Okay, I am pretty sure it is `LegacySupport` messing up something. See:
 https://stackoverflow.com/questions/39130040/cmath-hides-isnan-in-
 math-h-in-c14-c11

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Ticket URL: <https://trac.macports.org/ticket/66978#comment:1>
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