fixes for new warnings GCC started emitting

include/neso_particles/external_interfaces/petsc/boundary_interaction/boundary_interaction_2d.hpp

@@ -43,7 +43,7 @@ struct BoundaryNormalMapper {
    * @returns True if the boundary element is found otherwise false.
    */
   inline bool get(const INT global_id, REAL **normal) const {
-    BoundaryInteractionNormalData2D *node;
+    BoundaryInteractionNormalData2D *node = nullptr;
     bool *exists;
     const bool e = root->get_location(global_id, &exists, &node);
     *normal = node->d_normal;

include/neso_particles/external_interfaces/petsc/particle_cell_mapping/dmplex_2d_mapper.hpp

@@ -246,15 +246,15 @@ class DMPlex2DMapper {
           const int overlay_cell =
               k_overlay_mapper.get_linear_cell_index(cell_tuple);
           // Get the number of candidate cells
-          int num_candidates;
+          int num_candidates = 0;
           k_map_sizes->get(overlay_cell, &num_candidates);
-          int *candidates;
+          int *candidates = nullptr;
           k_map_candidates->get(overlay_cell, &candidates);
           // loop over candidates and test if point in cell
           for (int cx = 0; cx < num_candidates; cx++) {
             const int candidate = candidates[cx];
             // Get the cell data for this candidate cell
-            Implementation2DLinear::Linear2DData const *cell_data;
+            Implementation2DLinear::Linear2DData const *cell_data = nullptr;
             k_cell_data->get(candidate, &cell_data);
             // Test if point in candidate cell
             int num_crossings = 0;

test/include/test_neso_particles.hpp

@@ -81,7 +81,7 @@ inline std::filesystem::path get_test_resource(std::string resource_name) {
 #define MAKE_WRAP_METHOD(method_name)                                          \
   template <typename... T> auto wrap_##method_name(T... args) {                \
     return method_name(args...);                                               \
-  };
+  }
 #endif
 
 /**

test/test_petsc_project_evaluate.cpp

@@ -649,7 +649,7 @@ TEST(PETSC, dmplex_project_barycentric_coeffs) {
                                              {0.0, 0.0, 0.0, 0.0}};
 
     for (int px = 0; px < num_particles; px++) {
-      REAL l[4];
+      REAL l[4] = {0.0, 0.0, 0.0, 0.0};
       const REAL x = P->at(px, 0);
       const REAL y = P->at(px, 1);
       lambda_weights(num_vertices, vertices, x, y, &l[0], &l[1], &l[2], &l[3]);