[Bug libstdc++/71856] _GLIBCXX_DEBUG-mode breaks GNU parallel extension

[michael.hamann at kit dot edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71856

--- Comment #2 from Michael Hamann <michael.hamann at kit dot edu> ---
This is not about activating parallel mode, this is about using individual
parallel algorithms by directly including e.g. <parallel/algorithm> and using
the namespace __gnu_parallel explicitly. There I do not get the error you
mention. Is this not supported, too?