Fix warnings:

⚠️ ../src/libslic3r/SLA/SupportIslands/SampleIslandUtils.cpp:1495:68: warning: lambda capture 'tiny_done' is not used [-Wunused-lambda-capture]
⚠️ ../src/libslic3r/SLA/SupportIslands/SampleIslandUtils.cpp:1830:23: warning: unused variable 'line' [-Wunused-variable]
⚠️ ../src/libslic3r/SLA/SupportIslands/SampleIslandUtils.cpp:624:6: warning: unused function 'is_points_in_distance' [-Wunused-function]
⚠️ ../src/libslic3r/SLA/SupportIslands/VoronoiDiagramCGAL.cpp:37:7: warning: unused function 'to_point_d' [-Wunused-function]
⚠️ ../src/libslic3r/SLA/SupportPointGenerator.cpp:359:6: warning: unused function 'exist_same_points' [-Wunused-function]
⚠️ ../src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp:813:27: warning: using the result of an assignment as a condition without parentheses [-Wparentheses]
⚠️ ../src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp:892:146: warning: format specifies type 'int' but the argument has type 'size_t' (aka 'unsigned long') [-Wformat]

src/libslic3r/SLA/SupportIslands/SampleIslandUtils.cpp

@@ -620,6 +620,7 @@ void SampleIslandUtils::align_samples(SupportIslandPoints &samples,
     
 }
 
+#ifndef NDEBUG
 namespace {
 bool is_points_in_distance(const Slic3r::Point & p,
                            const Slic3r::Points &points,
@@ -633,6 +634,7 @@ bool is_points_in_distance(const Slic3r::Point & p,
     return true;
 }
 } // namespace
+#endif // NDEBUG
 
 coord_t SampleIslandUtils::align_once(
     SupportIslandPoints &samples, 
@@ -1492,7 +1494,7 @@ SampleIslandUtils::Field SampleIslandUtils::create_field(
 
     // Prepare data for field outline,
     // when field transit into tiny part of island
-    auto add_wide_tiny_change_only = [&wide_tiny_changes, &lines, &tiny_done]
+    auto add_wide_tiny_change_only = [&wide_tiny_changes, &lines]
     (const VoronoiGraph::Position &position){            
         Point p1, p2;
         std::tie(p1, p2) = VoronoiGraphUtils::point_on_lines(position, lines);
@@ -1827,7 +1829,6 @@ SupportIslandPoints SampleIslandUtils::sample_outline(
     using RestrictionPtr = std::shared_ptr<SupportOutlineIslandPoint::Restriction>;
     auto add_sample = [&](size_t index, const RestrictionPtr& restriction, coord_t &last_support) {
         using Position = SupportOutlineIslandPoint::Position;
-        const Line &  line = restriction->lines[index];
         const double &line_length_double = restriction->lengths[index];
         coord_t line_length = static_cast<coord_t>(std::round(line_length_double));
         if (last_support + line_length > sample_distance) {

src/libslic3r/SLA/SupportIslands/SupportIslandPoint.hpp

@@ -100,7 +100,7 @@ public:
     /// Can move?
     /// </summary>
     /// <returns>FALSE</returns>
-    virtual bool can_move() const override { return false; }
+    bool can_move() const override { return false; }
 
     /// <summary>
     /// No move!
@@ -108,7 +108,7 @@ public:
     /// </summary>
     /// <param name="destination">Wanted position</param>
     /// <returns>No move means zero distance</returns>
-    virtual coord_t move(const Point &destination) { return 0; }
+    coord_t move(const Point &destination) override { return 0; }
 };
 
 /// <summary>

src/libslic3r/SLA/SupportIslands/VoronoiDiagramCGAL.cpp

@@ -34,11 +34,8 @@ using Halfedge_handle = VD::Halfedge_handle;
 using Ccb_halfedge_circulator = VD::Ccb_halfedge_circulator;
 
 namespace{
-Vec2d to_point_d(const Site_2 &s) { return {s.x(), s.y()}; }
-Slic3r::Point to_point(const Site_2 &s) {
-    // conversion from double to coor_t
-    return Slic3r::Point(s.x(), s.y());
-}
+// conversion from double to coor_t
+Slic3r::Point to_point(const Site_2 &s) { return Slic3r::Point(s.x(), s.y()); }
 
 /// <summary>
 /// Create line segment lay between given points with distance limited by maximal_distance

src/libslic3r/SLA/SupportPointGenerator.cpp

@@ -356,6 +356,7 @@ bool contain_point(const Point &p, const Points &sorted_points) {
     return it->x() == p.x() && it->y() == p.y();
 };
 
+#ifndef NDEBUG
 bool exist_same_points(const ExPolygon &shape, const Points& prev_points) {
     auto shape_points = to_points(shape);
     return shape_points.end() !=
@@ -363,6 +364,7 @@ bool exist_same_points(const ExPolygon &shape, const Points& prev_points) {
             return contain_point(p, prev_points);
         });
 }
+#endif // NDEBUG
 
 Points sample_overhangs(const LayerPart& part, double dist2) {
     const ExPolygon &shape = *part.shape;

src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp

@@ -817,7 +817,7 @@ void GLGizmoSlaSupports::draw_island_config() {
 #ifdef OPTION_TO_STORE_ISLAND
     bool store_islands = !sample_config.path.empty();
     if (ImGui::Checkbox("StoreIslands", &store_islands)) {
-        if (store_islands = true)
+        if (store_islands == true)
             sample_config.path = "C:/data/temp/island<<order>>.svg";
     } else if (ImGui::IsItemHovered())
         ImGui::SetTooltip("Store islands in file\n<<order>> is replaced by island order number");
@@ -896,7 +896,7 @@ void GLGizmoSlaSupports::draw_island_config() {
         ImGui::SetTooltip("Minimal width to be supported by outline\nMust be smaller or equal to thin max width(to make hysteresis)");
 
     ImGui::Text("head radius is set to %.2f", unscale<float>(sample_config.head_radius));
-    ImGui::Text("Alignment stop criteria: min_move(%.0f um), iter(%d x), max_VD_move(%.2f mm)", unscale<float>(sample_config.minimal_move)*1000, sample_config.count_iteration, 
+    ImGui::Text("Alignment stop criteria: min_move(%.0f um), iter(%d x), max_VD_move(%.2f mm)", unscale<float>(sample_config.minimal_move)*1000, (int)sample_config.count_iteration, 
         unscale<float>(sample_config.max_align_distance)
     );