Cuda C – Linker error – undefined reference

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You have a problem with symbol name mangling. nvcc uses the host C++ compiler to compile host code, and this implies that symbol name mangling is applied to code emitted by the CUDA toolchain.

There are two solutions to this problem. The first is to define dummy_gpu using C linkage, so change your my_cuda.cu to something like this:

extern "C" {
#include "my_cuda.h"
}

.....


extern "C"
void dummy_gpu(){
   dummy_gpu_kernel<<<128,128>>>();
}

Note that you will need to change your linkage command to this:

gcc -L/usr/local_rwth/sw/cuda/5.0.35/lib64 -o md.exe main.o my_cuda.o -lcuda -lcudart

because the CUDA shared libraries need to be specified after the object files that use them.

Your second alternative would be to use either g++ or nvcc to do the linking, in which case the whole problem should disappear.

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