fix a few remaining warnings
and fix commainitializer unit test with MSVC
diff --git a/test/sparse.h b/test/sparse.h
index d18217e..128b129 100644
--- a/test/sparse.h
+++ b/test/sparse.h
@@ -24,15 +24,20 @@
#ifndef EIGEN_TESTSPARSE_H
-#ifdef __GNUC__
-#include <ext/hash_map>
+#include "main.h"
+
+#if EIGEN_GNUC_AT_LEAST(4,0)
+#include <tr1/unordered_map>
+#define EIGEN_UNORDERED_MAP_SUPPORT
+namespace std {
+ using std::tr1::unordered_map;
+}
#endif
#ifdef EIGEN_GOOGLEHASH_SUPPORT
#include <google/sparse_hash_map>
#endif
-#include "main.h"
#include <Eigen/Cholesky>
#include <Eigen/LU>
#include <Eigen/Sparse>
