benlangmuir wrote:

Right, that's what I meant by "Is it trying to set it too early before the VFS 
is created or something?".  We could make the driver setup the VFS like the 
frontend would and do that before checking the -working-directory; not sure if 
there's a reason we don't do that already.  Or maybe we could ignore the 
failure to set the working directory in the driver and check it in the 
frontend? That might cause some poor diagnostics if the driver is accessing 
relative paths and the working directory wasn't set successfully

https://github.com/llvm/llvm-project/pull/106577
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