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

[redi at gcc dot gnu.org via Gcc-bugs]

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

--- Comment #21 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The abi_check failures are of course expected if you configure with an option
that alters the library ABI.