https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104832
--- Comment #7 from Toolybird <toolybird at tuta dot io> --- I just stumbled across this openSUSE bug report which may or may not be related: https://bugzilla.opensuse.org/show_bug.cgi?id=1188621 Interesting that it mentions filesystem readdir which I hadn't considered as a possible factor. For the record, I'm building on ext4.