https://bugs.winehq.org/show_bug.cgi?id=53077
--- Comment #5 from Nikolay Sivov bunglehead@gmail.com --- (In reply to Konstantin from comment #4)
(In reply to Nikolay Sivov from comment #3)
Easiest way is to keep using a single make job. Otherwise you'll need patched binutils for mingw-w64, and maybe for the host as well.
*** This bug has been marked as a duplicate of bug 52770 ***
Can you please tell me how to do this? It compiles very slowly on 1 kernel.
Maybe you could ask Arch binutils/mingw-w64 package maintainers to include that binutils fix.