[cctbxbb] Windows icc builds

[Winter, Graeme (DLSLtd,RAL,LSCI)]

HI Folks

Following from a DIALS issue about it being slow on Windows

https://github.com/dials/dials/issues/1666

I have fallen into a rabbit hole and I am trying to build DIALS (and hence cctbx) on Windows with the intel compilers from oneAPI - however I keep stumbling over linking errors with e.g. undefined symbol __floor

Should I abandon hope or has someone done this?

I know this is not a new path to tread as windows_icc was a defined combination on the SConscripts

I had had to hack some bits around a little presumably to accommodate 2021 versions of icc compilers, but this felt like I was going down a bad path

Would welcome input from anyone who can help - currently windows DIALS is a pretty poor relation

It is noteworthy however that parallel operation does now appear to work on Windows with easy mp :-)

In other news - has anyone considered adding clang support with clang coming from conda? Could make for more consistency in the builds… I had a look at how one may go about doing this but rapidly found myself in SCons hell.

Thanks in advance for any help & all the best Graeme

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