[Bug libstdc++/58938] std::exception_ptr is missing on architectures with incomplete atomic int support

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58938

--- Comment #16 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It should work if you build GCC for ARMv7, i.e. configure --with-arch=armv7-a,
but that changes the instruction set used for all the target libraries.