Fix unused-function warning with Eigen < 3.2.2.
- CreateBlockJacobian() is only ever used when Eigen >= 3.2.2 is
detected, but was previously defined whenever CERES_USE_EIGEN_SPARSE
was defined with no check on the Eigen version.
- This resulted in an unused-function compile warning that became an
error due to -Werror, preventing compilation when using Eigen < 3.2.2.
Change-Id: I24628ff329f14b087ece66bf2626bdc0de4ba224
diff --git a/internal/ceres/reorder_program.cc b/internal/ceres/reorder_program.cc
index 23f301a..aa3d4ce 100644
--- a/internal/ceres/reorder_program.cc
+++ b/internal/ceres/reorder_program.cc
@@ -78,7 +78,7 @@
return min_parameter_block_position;
}
-#ifdef CERES_USE_EIGEN_SPARSE
+#if EIGEN_VERSION_AT_LEAST(3, 2, 2) && defined(CERES_USE_EIGEN_SPARSE)
Eigen::SparseMatrix<int> CreateBlockJacobian(
const TripletSparseMatrix& block_jacobian_transpose) {
typedef Eigen::SparseMatrix<int> SparseMatrix;
