https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92860
--- Comment #27 from David Binderman <dcb314 at hotmail dot com> --- (In reply to Martin Liška from comment #25) > Yes, it's definitely related. > Please attach -E file and a command line. Problem stills exists in the g++ compiler dated 20200623, but anything I do to reduce the problem makes it go away ;-< Confirmation sought that the stack backtrace I provided shows that the problem is a bug in the pre-processor. If so, -E isn't going to help.