Change visibilities of variant_visitor of pybind11

test=develop

paddle/fluid/pybind/protobuf.cc

@@ -30,11 +30,12 @@ namespace pybind11 {
 namespace detail {
 
 // Can be replaced by a generic lambda in C++14
-struct variant_caster_visitor : public boost::static_visitor<handle> {
+struct __attribute__((visibility("hidden"))) paddle_variant_caster_visitor
+    : public boost::static_visitor<handle> {
   return_value_policy policy;
   handle parent;
 
-  variant_caster_visitor(return_value_policy policy, handle parent)
+  paddle_variant_caster_visitor(return_value_policy policy, handle parent)
       : policy(policy), parent(parent) {}
 
   template <class T>
@@ -44,10 +45,10 @@ struct variant_caster_visitor : public boost::static_visitor<handle> {
 };
 
 template <class Variant>
-struct variant_caster;
+struct paddle_variant_caster;
 
 template <template <class...> class V, class... Ts>
-struct variant_caster<V<Ts...>> {
+struct paddle_variant_caster<V<Ts...>> {
   using Type = V<Ts...>;
 
   template <typename T>
@@ -90,7 +91,7 @@ struct variant_caster<V<Ts...>> {
 
   static handle cast(Type const &src, return_value_policy policy,
                      handle parent) {
-    variant_caster_visitor visitor(policy, parent);
+    paddle_variant_caster_visitor visitor(policy, parent);
     return boost::apply_visitor(visitor, src);
   }
 
@@ -101,7 +102,7 @@ struct variant_caster<V<Ts...>> {
 // Add specialization for concrete variant type
 template <class... Args>
 struct type_caster<boost::variant<Args...>>
-    : variant_caster<boost::variant<Args...>> {};
+    : paddle_variant_caster<boost::variant<Args...>> {};
 
 }  // namespace detail
 }  // namespace pybind11

paddle/fluid/pybind/pybind.cc

@@ -86,12 +86,12 @@ bool IsCompiledWithDIST() {
 #endif
 }
 
-PYBIND11_MODULE(core) {
+PYBIND11_MODULE(core, m) {
   // Not used, just make sure cpu_info.cc is linked.
   paddle::platform::CpuTotalPhysicalMemory();
 
   paddle::memory::allocation::UseAllocatorStrategyGFlag();
-  py::module m("core", "C++ core of PaddlePaddle");
+  m.doc() = "C++ core of PaddlePaddle";
 
   // using framework in this function. Since it is inside a function, it will
   // not cause namespace pollution.
@@ -907,7 +907,6 @@ All parameter, weight, gradient are variables in Paddle.
       });
 
   BindRecordIOWriter(&m);
-  return m.ptr();
 }
 }  // namespace pybind
 }  // namespace paddle