[Apache TVM Discuss] [Questions] How to create PackedFunc manually?

[JC Li via Apache TVM Discuss]

I'm trying to create PackedFunc manually for my baremetal app. Following the 
way calling below macro:

example.c
```
#include<tvm/runtime/packed_func.h>
int A_wrapper(blahblah);
TVM_DLL_EXPORT_TYPED_FUNC(A, A_wrapper_);
```
Linking the program complains**:  undefined reference to `__dso_handle'.** **I 
wonder where does it call dso_handle in stdlib?**

The macro expands into:
```
#define TVM_DLL_EXPORT_TYPED_FUNC(ExportName, Function)                         
            \
  extern "C" {                                                                  
            \
  TVM_DLL int ExportName(TVMValue* args, int* type_code, int num_args, 
TVMValue* out_value, \
                         int* out_type_code) {                                  
            \
    try {                                                                       
            \
      auto f = Function;                                                        
            \
      using FType = 
::tvm::runtime::detail::function_signature<decltype(f)>::FType;         \
      ::tvm::runtime::TVMRetValue rv;                                           
            \
      ::tvm::runtime::detail::unpack_call_by_signature<FType>::run(             
            \
          f, ::tvm::runtime::TVMArgs(args, type_code, num_args), &rv);          
            \
      rv.MoveToCHost(out_value, out_type_code);                                 
            \
      return 0;                                                                 
            \
    } catch (const ::std::runtime_error& _except_) {                            
            \
      TVMAPISetLastError(_except_.what());                                      
            \
      return -1;                                                                
            \
    }                                                                           
            \
  }                                                                             
            \
  }
```





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