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

[Florian Weimer]

On 01/27/2017 09:34 PM, Chris Metcalf wrote:
> I'd like to commit the one-line patch below that just declares the context
> variables for test-setcontext2 as static.  I think the consensus is that
> this is necessary,

No, I think the test is supposed to work as-is; it is valid.

So if this test is broken, it is a bug in the implementation of the 
context switching functions (as they are visible to applications, i.e. 
the fix might not be in the functions themselves, but adjusting their 
calling conventions, inhibiting GCC optimizations which make incorrect 
assumptions, etc.).

If we do not have a fix right now, it is better to let the test keep 
failing (perhaps XFAIL it), rather than tweaking it so that it tests 
something else.

Thanks,
Florian