Workbench building issue

[Matt_SF]

Since a few days I'm trying to build the latest SNEX workbench but I get this weird error from VS19 :

error D8021 numeric argument invalid '/Wno-everything' 

I have no idea why this is happening. I was (almost) always able to build the workbench without any problem...
I spent the last few days online but found no clue on how to resolve it...

And ideas ?

EDIT : oh I just saw Christoph's last post.