On Wed, 30 Nov 2022 at 06:04, François Dumont via Libstdc++ <
libstdc++@gcc.gnu.org> wrote:

> Good catch, then we also need this patch.
>

Is it worth printing an error? If we can't show the backtrace because of an
error, we can just print nothing there.

We also need to pass an error handler to the
__glibcxx_backtrace_create_state call in formatter.h.

Now that I look at this code again, why do we need the _M_backtrace_full
member? It's always set to the same thing, why can't we just call that
function directly?

And I think we should use threaded=1 for the
__glibcxx_backtrace_create_state call.

So like the attached patch.