initial commit

third_party/eigen/failtest/sparse_storage_mismatch.cpp

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+#include "../Eigen/Sparse"
+using namespace Eigen;
+
+typedef SparseMatrix<double, ColMajor> Mat1;
+#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
+typedef SparseMatrix<double, RowMajor> Mat2;
+#else
+typedef SparseMatrix<double, ColMajor> Mat2;
+#endif
+
+int main() {
+  Mat1 a(10, 10);
+  Mat2 b(10, 10);
+  a += b;
+}