https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109494
--- Comment #5 from Patrick Palka <ppalka at gcc dot gnu.org> --- (In reply to Patrick Palka from comment #4) > I can't reproduce the linker warning or bad output with GCC 12.2 or trunk on > x86_64-pc-linux-gnu: > > $ g++ -std=c++20 -fext-numeric-literals Main.ii Test.ii > $ ./a.out > /Users/Claire/Dropbox/SourceLoc/Test/Main.cpp > /Users/Claire/Dropbox/SourceLoc/Test/Test.cpp Oops, it was already established this is a darwin-specific issue, sorry for the noise.