[Insight-users] RE: XCode 2.4 and isnan

[Remo Mueller]

I'm currently working on MacOSX 10.4.7 with Xcode 2.4 installed, and  
I'm compiling the code using gcc version 4.0.1 (Apple Computer, Inc.  
build 5363), using CMake 2.4.3.

I ran into the same problem of isnan not being defined in  
vnl_math.cxx, which is located under Utilities/vxl/core/vnl/

I finally got ITK to compile by changing line 66 in vnl_math.cxx from:

	#define isnan(x) __isnand((double)x)

to

	#define isnan(x) __inline_isnand((double)x)

This line is defined in the #if defined (__APPLE__) code block.

I'm not sure if this is correct, but it seems to fix the problem.   
This problem exists in ITK 2.8.1 and the current version of CVS.  Can  
someone who's more knowledgeable about the inner workings of ITK  
verify if this fixes the original problem? Thanks

I hope this helps,
Remo Mueller

Case Western Reserve University
Computer Science BS/MS Program



> This is regarding the following build errors:
>
> http://www.itk.org/Testing/Sites/eno/Darwin-Xcode2.4-rel/
> 20060811-0100-Nightly/BuildError.html
>
> Last week a new version of Xcode was release. It seems to mostly work
> with ITK and CMake. However, there was a minor change to the isnan.
> The internal symbol __isnand is no longer used in the isnan macro,
> instead the marco reference __inline__isnan[fd]? inlined function is
> used. I was not able to figure what was going on in this header file
> and why the isnan macro would not work.
>
> I also suspect that this same problem will occur with a unix make
> file since it it a change to a system header file.
>
> Thanks,
> Brad
>
> ========================================================
> Bradley Lowekamp
> Management Systems Designers Contractor for
> Office of High Performance Computing and Communications
> National Library of Medicine
> blowekamp at mail.nih.gov
>