First off, building MicroPython with MSVC and the ports/windows/micropython.vcxproj was exceptionally easy. Good job!

But when trying to add support for LwIP with:

• -DMICROPY_PY_LWIP=1
• -DMICROPY_ENABLE_SCHEDULER=1
• Add extmod/modlwip.c and lib/netutils/netutils.c.

And trying to figure out where to add that in the .vcxproj files was not so easy. So I hacked up my own GNU-makefile.
And then getting to the link stage, I got this error:

lwip32.lib(sys_arch.obj) : error LNK2005: _sys_arch_protect already defined in MicroPython.lib(modlwip.obj)
lwip32.lib(sys_arch.obj) : error LNK2005: _sys_arch_unprotect already defined in MicroPython.lib(modlwip.obj)

Is there another define that should be set to avoid this? Adding -DNO_SYS=1 did not help.

Or are we supposed to link with a dynamic LwIP import-library? Since that works.