[PATCH] tst-setcontext2: avoid bug from compiler optimization

[Florian Weimer]

On 01/25/2017 01:35 AM, Chris Metcalf wrote:
> Ping!  I will plan to commit this later this week if no one objects; it
> seems like a straightforward bug avoidance.

It's very non-obvious why this should work.

I suspect the real cause is the lack of the returns_twice attribute on 
the getcontext function.  Does the problem go away if you add that?

If yes, this needs a bug report in Bugzilla, referenced from the 
ChangeLog and commit message because it is a user-visible bug.

Thanks,
Florian