[Insight-developers] vnl_math::pi coming up undefined with vectoroptimization turned on?

[kent williams]

Check this out -- I'm not alone

http://www.cdash.org/CDash/iphone/buildsummary.php?buildid=362106#_projects


On 10/22/09 3:05 PM, "kent williams" <norman-k-williams at uiowa.edu> wrote:

> I'm trying to build ITK on OS X with the "-O3" flag. I've never had trouble
> with "-O2" but now I get an undefined external for vnl_math::pi.
> 
> The main reason to go with "-O3" is to turn on vector SIMD optimizations --
> in one application we're trying to optimize, the biggest share of CPU is
> used in the ImageToImageMetric, and Shark is suggesting that the loops in
> the hot routines would benefit from vector optimizations.
> 
> I don't know why or from whence the problem originates, but what it looks
> like is that the vnl_math:: constants don't get declared as variables if
> VCL_STATIC_CONST_INIT_FLOAT_NO_DEFN is defined.
> 
> Now I'm no VXL library hacker,so I'm pretty much baffled by this thing.
> 
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