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Multi-gpu build with the following command fails on Ubuntu 20.04.5. Fix it by linking mpi_cxx library.

cmake -DSM=80 -DCMAKE_BUILD_TYPE=Release -DBUILD_PYT=ON -DBUILD_MULTI_GPU=ON ..; make -j

/usr/bin/ld: CMakeFiles/bert_triton_example.dir/bert_triton_example.cc.o: in function MPI::Op::Init(void ()(void const, void*, int, MPI::Datatype const&), bool)':
bert_triton_example.cc:(.text._ZN3MPI2Op4InitEPFvPKvPviRKNS_8DatatypeEEb[_ZN3MPI2Op4InitEPFvPKvPviRKNS_8DatatypeEEb]+0x1d): undefined reference to ompi_mpi_cxx_op_intercept' /usr/bin/ld: CMakeFiles/bert_triton_example.dir/bert_triton_example.cc.o: in function MPI::Intracomm::Clone() const':
bert_triton_example.cc:(.text._ZNK3MPI9Intracomm5CloneEv[_ZNK3MPI9Intracomm5CloneEv]+0x40): undefined reference to MPI::Comm::Comm()' /usr/bin/ld: CMakeFiles/bert_triton_example.dir/bert_triton_example.cc.o: in function MPI::Graphcomm::Clone() const':
bert_triton_example.cc:(.text._ZNK3MPI9Graphcomm5CloneEv[_ZNK3MPI9Graphcomm5CloneEv]+0x3b): undefined reference to MPI::Comm::Comm()' /usr/bin/ld: CMakeFiles/bert_triton_example.dir/bert_triton_example.cc.o: in function MPI::Cartcomm::Sub(bool const*) const':
bert_triton_example.cc:(.text._ZNK3MPI8Cartcomm3SubEPKb[_ZNK3MPI8Cartcomm3SubEPKb]+0xa1): undefined reference to MPI::Comm::Comm()' /usr/bin/ld: CMakeFiles/bert_triton_example.dir/bert_triton_example.cc.o: in function MPI::Intracomm::Create_graph(int, int const*, int const*, bool) const':
bert_triton_example.cc:(.text._ZNK3MPI9Intracomm12Create_graphEiPKiS2_b[_ZNK3MPI9Intracomm12Create_graphEiPKiS2_b]+0x42): undefined reference to MPI::Comm::Comm()' /usr/bin/ld: CMakeFiles/bert_triton_example.dir/bert_triton_example.cc.o: in function MPI::Cartcomm::Clone() const':
bert_triton_example.cc:(.text._ZNK3MPI8Cartcomm5CloneEv[_ZNK3MPI8Cartcomm5CloneEv]+0x3b): undefined reference to MPI::Comm::Comm()' /usr/bin/ld: CMakeFiles/bert_triton_example.dir/bert_triton_example.cc.o:bert_triton_example.cc:(.text._ZNK3MPI9Intracomm11Create_cartEiPKiPKbb[_ZNK3MPI9Intracomm11Create_cartEiPKiPKbb]+0xaa): more undefined references to MPI::Comm::Comm()' follow
/usr/bin/ld: CMakeFiles/bert_triton_example.dir/bert_triton_example.cc.o:(.data.rel.ro._ZTVN3MPI8DatatypeE[_ZTVN3MPI8DatatypeE]+0x78): undefined reference to MPI::Datatype::Free()' /usr/bin/ld: CMakeFiles/bert_triton_example.dir/bert_triton_example.cc.o:(.data.rel.ro._ZTVN3MPI3WinE[_ZTVN3MPI3WinE]+0x48): undefined reference to MPI::Win::Free()'`

@dskhudia
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@byshiue for review. Is this an issue you have seen?

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