Cmath and math.h Changes in Xcode 2.4

• Subject: Cmath and math.h Changes in Xcode 2.4
• From: Mike Jackson <email@hidden>
• Date: Mon, 28 Aug 2006 22:59:19 -0400
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• Thread-topic: Cmath and math.h Changes in Xcode 2.4
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Was there some change to Xcode (and the entire tool chain) in Xcode 2.4 that
would affect the isnan(x) function?

I have now come across two open source packages that get hung up on
"isnan(x) is undeclared in this context"  type errors.

The projects are OpenSceneGraph (www.openscenegraph.net) and ITK
(www.itk.org).

In ITK's case I had to change a #define to look like the following:

#if defined(__APPLE__)
#if (__GNUC__ >= 4)
  #include <cmath>
  #define isnan(x) std::isnan(x)
#else
  #include <math.h>
  #define isnan(x) __isnand((double)x)
#endif
#endif

Where as it used to be just:
#if defined(__APPLE__)
  #include <math.h>
  #define isnan(x) __isnand((double)x)
#endif

 Just curious....

--
Mike Jackson
imikejackson <at> gmail <dot> com


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