https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93876
--- Comment #5 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> --- (In reply to Oleg Endo from comment #4) > the error message is > > unable to find a register to spill in class 'R0_REGS' > > please try to re-build with -mlra Yes, that helps and I just realized that I reported the wrong issue since building webkit2gtk provokes multiple bugs. The one I mentioned in PR91913 affected a different source file.