https://bugs.winehq.org/show_bug.cgi?id=50813
--- Comment #10 from Non 19non91@gmail.com --- Latest commit with -O0: no errors. Arch PKGBUILD with -O0: no errors. Latest commit without specifying -O0 or -g: no errors. Latest commit without specifying anything through Arch's PKGBUILD: no errors.
Looks like I can't reproduce.
Also it is funny that I completely forgot about make clean and used git clean -f + git reset --hard instead, which had no effect due to autogenerated .gitignore. It seems that bisection was a time waste due to that.