On 10/24/2014 09:50 AM, Brad King wrote:
> With 3.0 we see the list of headers accumulate.  With 3.1 just the
> first one works and the rest do not.

I bisected it down to:

commit 5abfde6cb8a1ae0b2825797eab6c2e9842eb7c49
Author: Ben Boeckel <ben.boec...@kitware.com>
Date:   Wed Mar 12 14:01:45 2014 -0400

    cmDefinitions: Don't store parent lookups

    When looking up scopes, it is faster to not store the lookup locally to
    keep the maps smaller and avoid extra allocations and rebalancing.

-Brad

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