[LLVMdev] using external functions from llvm

Alec Benzer alecbenzer at gmail.com
Thu Aug 19 15:37:15 PDT 2010

Is there documentation somewhere on how to call external functions from
llvm? The only guide I found was this: http://www.gearleaf.com/blog/post/44,
and it doesn't seem to be working for me.

I have a function:

llvm::GenericValue lle_X_create_number_object(llvm::FunctionType* ft, const
std::vector<llvm::GenericValue>& args)
  llvm_object_structure* result = new llvm_object_structure;
  result->typeIdx = TypeSystem::number;
  result->data = reinterpret_cast<unsigned char*>(new
  llvm::GenericValue gv;
  gv.PointerVal = reinterpret_cast<void*>(result);
  return gv;

defined in an extern "C" block. I add it as a symbol with:


yet when attempting to call it I still get: "LLVM ERROR: Program used
external function 'create_number_object' which could not be resolved!"
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