Update pybind11 to version 2.2.0

- Replace PYBIND11_PLUGIN with PYBIND11_MODULE

- Fix warnings about symbol visibility by replacing
  'namespace pybind11' with 'namespace PYBIND11_NAMESPACE'

- Pybind sets the default visibility of its namespace to 'hidden'
  Thus, our export functions like  ExportCSG(py::module &m) also are
  hidden by default. To work around that define DLL_HEADER
  '__attribute__ ((visibility ("default")))
  on GNUC platforms.

external_dependencies/pybind11

@@ -1 +1 @@
-Subproject commit fe0cf8b73b8e068c205e062c779eb694b194d6b4
+Subproject commit 2a5a5ec0a47c245fbf1bb1a8a90b4c3278e01693

libsrc/csg/python_csg.cpp

@@ -619,10 +619,8 @@ DLL_HEADER void ExportCSG(py::module &m)
     ;
 }
 
-PYBIND11_PLUGIN(libcsg) {
-  py::module m("csg", "pybind csg");
+PYBIND11_MODULE(libcsg, m) {
   ExportCSG(m);
-  return m.ptr();
 }
 #endif
 

libsrc/csg/vscsg.cpp

@@ -527,10 +527,8 @@ DLL_HEADER void ExportCSGVis(py::module &m)
 	});
 }
 
-PYBIND11_PLUGIN(libcsgvis) {
-  py::module m("csg", "pybind csg");
+PYBIND11_MODULE(libcsgvis, m) {
   ExportCSGVis(m);
-  return m.ptr();
 }
 #endif
 

libsrc/general/ngpython.hpp

@@ -6,7 +6,8 @@ namespace py = pybind11;
 #include <iostream>
 #include <sstream>
 
-namespace pybind11 {
+
+namespace PYBIND11_NAMESPACE {
 template<typename T>
 bool CheckCast( py::handle obj ) {
   try{

libsrc/geom2d/python_geom2d.cpp

@@ -265,10 +265,8 @@ DLL_HEADER void ExportGeom2d(py::module &m)
   
 }
 
-PYBIND11_PLUGIN(libgeom2d) {
-  py::module m("geom2d", "pybind geom2d");
+PYBIND11_MODULE(libgeom2d, m) {
   ExportGeom2d(m);
-  return m.ptr();
 }
 
 #endif

libsrc/include/mydefs.hpp

@@ -21,7 +21,11 @@
       #define DLL_HEADER   __declspec(dllimport)
    #endif
 #else
-   #define DLL_HEADER 
+   #if __GNUC__ >= 4
+      #define DLL_HEADER __attribute__ ((visibility ("default")))
+   #else
+      #define DLL_HEADER
+   #endif
 #endif
 
 

libsrc/include/nginterface.h

@@ -23,7 +23,11 @@
       #define DLL_HEADER   __declspec(dllimport)
    #endif
 #else
-   #define DLL_HEADER 
+   #if __GNUC__ >= 4
+      #define DLL_HEADER __attribute__ ((visibility ("default")))
+   #else
+      #define DLL_HEADER
+   #endif
 #endif
 
 

libsrc/meshing/python_mesh.cpp

@@ -816,10 +816,8 @@ DLL_HEADER void ExportNetgenMeshing(py::module &m)
                                                    }));
 }
 
-PYBIND11_PLUGIN(libmesh) {
-  py::module m("mesh", "pybind mesh");
+PYBIND11_MODULE(libmesh, m) {
   ExportNetgenMeshing(m);
-  return m.ptr();
 }
 #endif
 

libsrc/occ/python_occ.cpp

@@ -46,10 +46,8 @@ DLL_HEADER void ExportNgOCC(py::module &m)
     ;
 }
 
-PYBIND11_PLUGIN(libNgOCC) {
-  py::module m("NgOCC", "pybind NgOCC");
+PYBIND11_MODULE(libNgOCC, m) {
   ExportNgOCC(m);
-  return m.ptr();
 }
 
 #endif // OCCGEOMETRY

libsrc/stlgeom/python_stl.cpp

@@ -6,8 +6,6 @@
 
 #ifdef WIN32
    #define DLL_HEADER   __declspec(dllexport)
-#else
-   #define DLL_HEADER 
 #endif
 
 using namespace netgen;
@@ -47,10 +45,8 @@ DLL_HEADER void ExportSTL(py::module & m)
     ;
 }
 
-PYBIND11_PLUGIN(libstl) {
-  py::module m("stl", "pybind stl");
+PYBIND11_MODULE(libstl, m) {
   ExportSTL(m);
-  return m.ptr();
 }
 
 #endif

libsrc/stlgeom/vsstl.cpp

@@ -1218,8 +1218,6 @@ void VisualSceneSTLMeshing :: MouseDblClick (int px, int py)
 
 #ifdef WIN32
    #define DLL_HEADER   __declspec(dllexport)
-#else
-   #define DLL_HEADER 
 #endif
 
 #include <../general/ngpython.hpp>
@@ -1245,9 +1243,7 @@ DLL_HEADER void ExportSTLVis(py::module &m)
 	});
 }
 
-PYBIND11_PLUGIN(libstlvis) {
-  py::module m("stlvis", "pybind stl vis");
+PYBIND11_MODULE(libstlvis, m) {
   ExportSTLVis(m);
-  return m.ptr();
 }
 #endif

ng/netgenpy.cpp

@@ -21,9 +21,8 @@ void DLL_HEADER ExportSTLVis(py::module &m);
 void DLL_HEADER ExportNgOCC(py::module &m);
 #endif // OCCGEOMETRY
 
-PYBIND11_PLUGIN(libngpy)
+PYBIND11_MODULE(libngpy, ngpy)
 {
-    py::module ngpy("libngpy", "pybind netgen module");
     py::module meshing = ngpy.def_submodule("_meshing", "pybind meshing module");
     ExportNetgenMeshing(meshing);
     py::module csg = ngpy.def_submodule("_csg", "pybind csg module");
@@ -44,7 +43,6 @@ PYBIND11_PLUGIN(libngpy)
     py::module stlvis = ngpy.def_submodule("stlvis", "pybind stlvis module");
     ExportSTLVis(stlvis);
 #endif // OPENGL
-    return ngpy.ptr();
 }
 
 // Force linking libnglib to libnetgenpy