Built directories can't be moved across filesystems

[valeth]

Issue

If the CRYSTAL_BUILD_CACHE_PATH is set to a location outside of the filesystem where CRENV_ROOT is located the move will fail.

Apparently the rename function doesn't support moves between filesystems.

Potential fix

Other options seem to be the File::Copy::Recursive module.
I would try and fix it myself, but I don't know anything about Perl.

Error message

With CRYSTAL_BUILD_CACHE_PATH set to /tmp/crystal-build

...
Moving the Crystal directory ...faild to move the Crystal directory Invalid cross-device link

[taylorthurlow]

I'm going to close this one because it's just not going to get fixed in this project. There's a ticket open in the rewrite repo for supporting the CRYSTAL_BUILD_CACHE_PATH variable, and once that's implemented we can evaluate whether or not this is still an issue, but I don't expect Crystal's filesystem libraries to not support cross-filesystem transfers. I've left myself a note in the linked issue to check cross-filesystem support.