Created by: reyoung

It seems that in this file, boost disable variadic template support when nvcc != 7.5. It says that nvcc has bug to handle C++ variadic template.

But our refactoring code is using boost::variant, which is used the variadic template in C++ 11. If we use boost > 1.61 and nvcc != 7.5, the error will occurred like below:

Undefined symbols for architecture x86_64:
  "paddle::platform::is_cpu_place(boost::variant<paddle::platform::GPUPlace, paddle::platform::CPUPlace, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_> const&)", referenced from:
      float* paddle::framework::Tensor::mutable_data<float>(boost::variant<paddle::platform::GPUPlace, paddle::platform::CPUPlace, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>) in libadd_op.a(add_op_generated_add_op.cu.o)
      paddle::framework::Tensor::PlaceholderImpl<float, paddle::platform::CPUPlace>::PlaceholderImpl(paddle::platform::CPUPlace, unsigned long) in libadd_op.a(add_op_generated_add_op.cu.o)
      paddle::framework::Tensor::PlaceholderImpl<float, paddle::platform::GPUPlace>::PlaceholderImpl(paddle::platform::GPUPlace, unsigned long) in libadd_op.a(add_op_generated_add_op.cu.o)
  "paddle::platform::is_gpu_place(boost::variant<paddle::platform::GPUPlace, paddle::platform::CPUPlace, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_> const&)", referenced from:
      paddle::framework::OperatorWithKernel::OpKernelHash::operator()(paddle::framework::OperatorWithKernel::OpKernelKey const&) const in libadd_op.a(add_op_generated_add_op.cu.o)
      float* paddle::framework::Tensor::mutable_data<float>(boost::variant<paddle::platform::GPUPlace, paddle::platform::CPUPlace, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_>) in libadd_op.a(add_op_generated_add_op.cu.o)
  "paddle::platform::places_are_same_class(boost::variant<paddle::platform::GPUPlace, paddle::platform::CPUPlace, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_> const&, boost::variant<paddle::platform::GPUPlace, paddle::platform::CPUPlace, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_, boost::detail::variant::void_> const&)", referenced from:
      paddle::framework::OperatorWithKernel::OpKernelKey::operator==(paddle::framework::OperatorWithKernel::OpKernelKey const&) const in libadd_op.a(add_op_generated_add_op.cu.o)
ld: symbol(s) not found for architecture x86_64

There should be two situations.

1. Check boost and nvcc version in CMake, and give a reasonable error. Freeze our boost and nvcc to some version.

2. Always define BOOST_NO_CXX11_VARIADIC_TEMPLATES when GPU=ON. To generate same function symbols between gcc/clang and nvcc