https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81122
--- Comment #19 from Maxim Egorushkin <maxim.yegorushkin at gmail dot com> --- (In reply to Jonathan Wakely from comment #17) > At this time LWG 2381 is still open. Until the proposed fix (or some other > fix) is resolved by making a change to the draft standard, I do not want to > change libstdc++. May be enable hexfloat round-trip if a user defines a macro? The standards often follow existing practice, waiting on the standard may lead to a deadlock.