27340f9 final minor e03eabc allow win32 git-subtree-dir: subtree/rabit git-subtree-split: 27340f95e43ef6f756f4882844d8c42a10d3b78e
85b7463 change def of reducer to take function ptr fe6366e add engine base a98720e more deps git-subtree-dir: subtree/rabit git-subtree-split: 85b746394e0bed36a22ebb12beb8672616b39047
git-subtree-dir: subtree/rabit git-subtree-split: c7282acb2a92e1d6a32614889ff466fec58937f3