fix compile (add default checkTopolgy in GFace)

Fltk/graphicWindow.cpp

@@ -481,6 +481,7 @@ graphicWindow::graphicWindow(bool main, int numTiles)
 
   int mode = FL_RGB | FL_DEPTH | (CTX::instance()->db ? FL_DOUBLE : FL_SINGLE);
   if(CTX::instance()->antialiasing) mode |= FL_MULTISAMPLE;
+  mode |= FL_STEREO;
   for(unsigned int i = 0; i < gl.size(); i++) gl[i]->mode(mode);
 
   tile->end();

Geo/GFace.h

@@ -121,10 +121,10 @@ class GFace : public GEntity
   // surface. This topological constant can be computed using both the
   // geometry and the mesh. Both approaches should give the same result ;-)
   // by default, genus is ZERO
-  int poincareMesh ();
-  int genusMesh () { return (poincareMesh() + edgeLoops.size() - 2) / 2; }
-  virtual int genusGeom ();
-  virtual bool checkTopology() = 0 ;
+  int poincareMesh();
+  int genusMesh() { return (poincareMesh() + edgeLoops.size() - 2) / 2; }
+  virtual int genusGeom();
+  virtual bool checkTopology(){ return true; }
 
   // return the point on the face corresponding to the given parameter
   virtual GPoint point(double par1, double par2) const = 0;

Geo/OCCFace.h

@@ -40,7 +40,6 @@ class OCCFace : public GFace {
   virtual double curvatures(const SPoint2 &param, SVector3 *dirMax, SVector3 *dirMin,
                             double *curvMax, double *curvMin) const;
   surface_params getSurfaceParams() const;
-  virtual bool checkTopology() {return true;};
 };
 
 #endif

Geo/discreteFace.h

@@ -24,7 +24,6 @@ class discreteFace : public GFace {
                          SVector3 *dudu, SVector3 *dvdv, SVector3 *dudv) const;
   void setBoundEdges(std::vector<int> tagEdges);
   void findEdges(std::map<MEdge, std::vector<int>, Less_Edge > &map_edges);
-  virtual bool checkTopology() {return true;};
 };
 
 #endif

Geo/gmshFace.h

@@ -33,7 +33,6 @@ class gmshFace : public GFace {
   void *getNativePtr() const { return s; }
   virtual SPoint2 parFromPoint(const SPoint3 &) const;
   virtual void resetMeshAttributes();
-  virtual bool checkTopology() {return true;};
 };
 
 #endif