labath added a comment.

In https://reviews.llvm.org/D32787#745139, @probinson wrote:

> In https://reviews.llvm.org/D32787#745099, @labath wrote:
>
> > Could it be that you just have stale cmake cache?
>
>
> That could easily be true.  Rerunning cmake didn't fix it; short of deleting 
> the entire build directory, is there a way to refresh the cache?


Opening the CMakeCache.txt, and deleting the HAVE_PPOLL line should re-trigger 
the detection. But if that doesn't fix it, I'd certainly recommend nuking the 
build directory before looking for problems elsewhere.


Repository:
  rL LLVM

https://reviews.llvm.org/D32787



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