After the retirement of CONFIG_SCHED_EXIT_KILL_CHILDREN, [1]
the behavior is now effectively controlled by
CONFIG_SCHED_CHILD_STATUS, which is IMO confusing.
(It was even surprising me.)
This commit solves it by making HAVE_GROUP_MEMBERS
a synonym of !CONFIG_DISABLE_PTHREAD. I guess this change aligns
the intention of the CONFIG_SCHED_EXIT_KILL_CHILDREN retirement.
That is, always tries to be similar to the standard behavior.
Another option would be to revive CONFIG_SCHED_EXIT_KILL_CHILDREN
and make the HAVE_GROUP_MEMBERS logic aware of it.
It might be a good idea if we want a finer-grained control of
code to build. (One can argue his application uses pthread
but does never _exit. In that case, it might be a waste to maintain
group membership. I suspect it might not be too rare in embedded
world.)
[1] commit 6982eb35fe
8a972817e0