[Bug libstdc++/96817] __cxa_guard_acquire unsafe against dynamically loaded pthread

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96817

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
it's been always that way - but yes, people repeatedly fall into this trap