https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120653
--- Comment #19 from H.J. Lu <hjl.tools at gmail dot com> --- I opened a glibc bug: https://sourceware.org/bugzilla/show_bug.cgi?id=33088 and attached a patch: https://sourceware.org/bugzilla/attachment.cgi?id=16138