Restore compatibility with eckit 1.17.1

Author: wdeconinck

src/atlas/interpolation/AssembleGlobalMatrix.cc

@@ -139,7 +139,13 @@ linalg::SparseMatrixStorage assemble_global_matrix(const Interpolation& interpol
                 max_gidx = std::max(max_gidx, global_index(i));
             }
         }
+#if ATLAS_ECKIT_VERSION_AT_LEAST(1, 22, 2)
+        // eckit::mpi::Comm::reduceInPlace() was only added in eckit 1.22.2
         mpi_comm.reduceInPlace(max_gidx, eckit::mpi::max(), mpi_root);
+#else
+        mpi_comm.allReduceInPlace(max_gidx, eckit::mpi::max());
+        (void)mpi_root; // to silence unused lambda capture warning
+#endif
         return max_gidx;
     };
 

src/sandbox/interpolation/atlas-global-matrix.cc

@@ -256,7 +256,11 @@ int AtlasGlobalMatrix::execute(const AtlasTool::Args& args) {
             auto tgt = eckit::linalg::Vector(tgt_data.data(), tgt_data.size());
             auto eckit_matrix = atlas::linalg::make_non_owning_eckit_sparse_matrix(matrix);
             timers.global_matrix_exe.start();
+#if ATLAS_ECKIT_VERSION_AT_LEAST(1, 19, 0)
             eckit::linalg::LinearAlgebraSparse::backend().spmv(eckit_matrix, src, tgt);
+#else
+            eckit::linalg::LinearAlgebra::backend().spmv(eckit_matrix, src, tgt);
+#endif
             timers.global_matrix_exe.stop();
             Log::info() << "Global matrix-multiply timer  \t: " << 1000.*timers.global_matrix_exe.elapsed()  << " [ms]" << std::endl;
             Log::info() << "Global matrix non-zero entries\t: " << matrix.nnz() << std::endl;

src/tests/interpolation/test_interpolation_global_matrix.cc

@@ -165,7 +165,11 @@ using SparseMatrixStorage = atlas::linalg::SparseMatrixStorage;
               auto src = eckit::linalg::Vector(src_data.data(), src_data.size());
               auto tgt = eckit::linalg::Vector(tgt_data.data(), tgt_data.size());
               auto eckit_matrix = atlas::linalg::make_non_owning_eckit_sparse_matrix(matrix);
+#if ATLAS_ECKIT_VERSION_AT_LEAST(1, 19, 0)
               eckit::linalg::LinearAlgebraSparse::backend().spmv(eckit_matrix, src, tgt);
+#else
+              eckit::linalg::LinearAlgebra::backend().spmv(eckit_matrix, src, tgt);
+#endif
             }
             auto tfield_global_v = array::make_view<double,1>(tgt_field_global);
             for (gidx_t i = 0; i < tgt_data.size(); ++i) {
@@ -207,7 +211,11 @@ using SparseMatrixStorage = atlas::linalg::SparseMatrixStorage;
                 }
                 auto tgt = eckit::linalg::Vector(tgt_data.data(), tgt_data.size());
                 auto eckit_matrix = atlas::linalg::make_non_owning_eckit_sparse_matrix(gmatrix);
+#if ATLAS_ECKIT_VERSION_AT_LEAST(1, 19, 0)
                 eckit::linalg::LinearAlgebraSparse::backend().spmv(eckit_matrix, src, tgt);
+#else
+                eckit::linalg::LinearAlgebra::backend().spmv(eckit_matrix, src, tgt);
+#endif
             }
         }