[Insight-developers] ITK 3.14 cannot build with GCC on non-ix86

[Steve M. Robbins]

Hi,

Has anyone successfully built ITK using GCC on a platform other than
x86 or amd64?

The Debian builds for 3.14 are failing [1] on all platforms (other
than i386 and amd64), mainly with this error:

> /build/buildd-insighttoolkit_3.14.0-1-alpha-pWsSda/insighttoolkit-3.14.0/Utilities/vxl/core/vnl/vnl_math.h: In member function 'virtual void itk::SPSAOptimizer::GenerateDelta(unsigned int)':
> /build/buildd-insighttoolkit_3.14.0-1-alpha-pWsSda/insighttoolkit-3.14.0/Utilities/vxl/core/vnl/vnl_math.h:220: error: unknown register name 'st' in 'asm'
> make[3]: *** [Code/Numerics/CMakeFiles/ITKNumerics.dir/itkSPSAOptimizer.o] Error 1

My first guess is that the assembly code in vnl_math.h (the new
rounding functions) is actually ix86-specific.  Can anyone confirm?  Here is the
failing code, for reference:

inline int vnl_math_rnd_halfinttoeven(double  x)
{
# ifdef VNL_CHECK_FPU_ROUNDING_MODE
  assert(fegetround()==FE_TONEAREST);
# endif
  int r;
  __asm__ __volatile__ ("fistpl %0" : "=m"(r) : "t"(x) : "st");
  return r;
}

Thanks,
-Steve

[1] https://buildd.debian.org/~luk/status/package.php?p=insighttoolkit
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