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Re: Cmath and math.h Changes in Xcode 2.4

On Aug 28, 2006, at 7:59 PM, Mike Jackson wrote:

Was there some change to Xcode (and the entire tool chain) in Xcode 2.4 that
would affect the isnan(x) function?

There were no changes in the toolchain, but there may have been changes in the headers. I'd suggest asking this question on the perfoptimization-dev list because the folks from the Numerics team who own the math headers are on that list.

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

I'm curious...is there some reason why you can't simply call isnan() and remove that block altogether?

-Eric

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 >Cmath and math.h Changes in Xcode 2.4 (From: Mike Jackson <email@hidden>)



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