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There's support for cross-compilation, it's even documented:

http://crystal-lang.org/docs/syntax_and_semantics/cross-comp...

But porting stuff to Windows is far from trivial: there's making LLVM work, there's exception handling, string handling (seems it's UTF-16 rather than UTF-8 in some places), etc. It's definitely on our long-term roadmap, it will just take a lot of time and effort.

And ARM is also on our roadmap, hopefully a short/mid term one.

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Good to know that cross-compilation is supported at least.

LLVM is supported on Windows. [1]

Talking to Windows APIs requires UTF-16, but UTF-8 can (and should!) be used in all languages on all platforms internally. It's trivial to add a UTF-8-to-16 conversion step when calling a Windows API (and the other direction on receiving such strings from Windows).

[1] http://llvm.org/docs/GettingStartedVS.html

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