Compilation error: expected primary-expression before token

I’m packaging pytorch_sparse for NixOS.

Bug description

Version: revision 2eff407270c271424ecaf6b8fbcaa7dc1564ffac (current master HEAD atm) When building I get many errors such as this one:

/build/pytorch_sparse-2eff407/csrc/cpu/spspmm_cpu.cpp:90:62: error: expected primary-expression before ‘>’ token
   90 |         valC_data = optional_valueC.value().data_ptr<scalar_t>();
      |                                                              ^

Investigations

Could be an issue in my build setup but I don’t have much knowledge about this issue with gcc.

Seems related to this:

• https://stackoverflow.com/questions/5802077/strange-gcc-error-expected-primary-expression-before-token
• https://stackoverflow.com/questions/610245/where-and-why-do-i-have-to-put-the-template-and-typename-keywords

More

For the record:

torch-sparse-cuda = super.buildPythonPackage rec {
        pname = "torch_sparse";
        version = "0.6.0+cuda";

        doCheck = false;

        src = pkgs.fetchgit {
          url = "https://github.com/rusty1s/pytorch_sparse";
          rev = "2eff407270c271424ecaf6b8fbcaa7dc1564ffac";
          sha256 = "1cpjwkxlah0xrv9gv4m3bmm837zv3x5lxqdp4b90nb0am4zf8dsh";
        };

        nativeBuildInputs = with pkgs; [
          which
          gcc
        ];

        buildInputs = with super; [
          pytestrunner
        ];

        propagatedBuildInputs = with super; [
          pytorch
        ];
      };

[matherm]

I just had the same problem and resolved it by upgrading pytorch to 1.5.0.

conda install -c pytorch pytorch
export CUDA=cu92 # cuda 9.2. in my case
pip install torch-scatter==latest+${CUDA} torch-sparse==latest+${CUDA} -f https://pytorch-geometric.com/whl/torch-1.5.0.html

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