MPS: Win64 testers?

[Pip Cet]

Is anyone building the scratch/igc branch for/on win64 systems? I'm trying to 
do that on wine/msys2/mingw64 (not an actual Windows installation), and there 
are a number of issues that need to be fixed, and I'm wondering whether I'm the 
first person to run into them. Quite possibly, they're specific to wine.

- mps doesn't compile with GCC (and, when it does, needs to be told that a 
machine word is unsigned long long, not unsigned long)
- _setjmp_ex assumes 16-byte alignment of jmp_buf to store the XMM registers, 
but we allocate handlers with 8-byte alignment in MPS builds.

Is this a wine bug, or is the MPS build currently non-functional on win64?

Pip