avoid various compiler warnings

include/mapnik/agg_renderer.hpp

@@ -102,9 +102,9 @@ public:
     void process(glyph_symbolizer const& sym,
                  Feature const& feature,
                  proj_transform const& prj_trans);    
-    inline bool process(rule::symbolizers const& syms,
-                        Feature const& feature,
-                        proj_transform const& prj_trans)
+    inline bool process(rule::symbolizers const& /*syms*/,
+                        Feature const& /*feature*/,
+                        proj_transform const& /*prj_trans*/)
     {
         // agg renderer doesn't support processing of multiple symbolizers.
         return false;

include/mapnik/cairo_renderer.hpp

@@ -118,12 +118,12 @@ public:
     void process(glyph_symbolizer const& sym,
                  Feature const& feature,
                  proj_transform const& prj_trans);
-    inline bool process(rule::symbolizers const& syms,
-      Feature const& feature,
-      proj_transform const& prj_trans)
+    inline bool process(rule::symbolizers const& /*syms*/,
+      Feature const& /*feature*/,
+      proj_transform const& /*prj_trans*/)
     {
-  // cairo renderer doesn't support processing of multiple symbolizers.
-  return false;
+        // cairo renderer doesn't support processing of multiple symbolizers.
+        return false;
     };
 protected:
     void render_marker(const int x, const int y, marker &marker, const agg::trans_affine & mtx, double opacity=1.0);

include/mapnik/font_engine_freetype.hpp

@@ -492,6 +492,8 @@ struct text_renderer : private boost::noncopyable
 
 private:
 
+    // unused currently, stroker is the new method for drawing halos
+    /*
     void render_halo(FT_Bitmap *bitmap,unsigned rgba,int x,int y,int radius)
     {
         int x_max=x+bitmap->width;
@@ -512,6 +514,7 @@ private:
             }
         }
     }
+    */
 
     void render_bitmap(FT_Bitmap *bitmap,unsigned rgba,int x,int y)
     {

include/mapnik/png_io.hpp

@@ -204,7 +204,7 @@ void reduce_4 (T const& in, image_data_8 & out, octree<rgb> trees[], unsigned li
 
 // 1-bit but only one color.
 template <typename T>
-void reduce_1(T const&, image_data_8 & out, octree<rgb> trees[], unsigned limits[], std::vector<unsigned> & alpha)
+void reduce_1(T const&, image_data_8 & out, octree<rgb> /*trees*/[], unsigned /*limits*/[], std::vector<unsigned> & /*alpha*/)
 {
     out.set(0); // only one color!!!
 }

include/mapnik/svg/svg_path_adapter.hpp

@@ -886,7 +886,7 @@ public:
     {
         return m_vertices.size() ? 
             m_vertices[m_vertices.size() - 1].cmd : 
-            path_cmd_stop;
+            (unsigned)path_cmd_stop;
     }
 
     unsigned last_vertex(double* x, double* y) const