#error C++17 or later compatible compiler is required to use PyTorch

[DewiBrynJones]

ctcdecode setup fails with the latest pytorch (as of November 2023 - 2.1.0).

The complete error message is...

In file included from /usr/local/lib/python3.10/dist-packages/torch/include/torch/csrc/api/include/torch/torch.h:3,
88.33                        from ctcdecode/src/binding.cpp:5:
88.33       /usr/local/lib/python3.10/dist-packages/torch/include/torch/csrc/api/include/torch/all.h:4:2: error: #error C++17 or later compatible compiler is required to use PyTorch.
88.33           4 | #error C++17 or later compatible compiler is required to use PyTorch.
88.33             |  ^~~~~
88.33       In file included from /usr/local/lib/python3.10/dist-packages/torch/include/c10/util/string_view.h:4,
88.33                        from /usr/local/lib/python3.10/dist-packages/torch/include/c10/util/StringUtil.h:6,
88.33                        from /usr/local/lib/python3.10/dist-packages/torch/include/c10/util/Exception.h:5,
88.33                        from /usr/local/lib/python3.10/dist-packages/torch/include/c10/core/Device.h:5,
88.33                        from /usr/local/lib/python3.10/dist-packages/torch/include/ATen/core/TensorBody.h:11,
88.33                        from /usr/local/lib/python3.10/dist-packages/torch/include/ATen/core/Tensor.h:3,
88.33                        from /usr/local/lib/python3.10/dist-packages/torch/include/ATen/Tensor.h:3,
88.33                        from /usr/local/lib/python3.10/dist-packages/torch/include/torch/csrc/autograd/function_hook.h:3,
88.33                        from /usr/local/lib/python3.10/dist-packages/torch/include/torch/csrc/autograd/cpp_hook.h:2,
88.33                        from /usr/local/lib/python3.10/dist-packages/torch/include/torch/csrc/autograd/variable.h:6,
88.33                        from /usr/local/lib/python3.10/dist-packages/torch/include/torch/csrc/autograd/autograd.h:3,
88.33                        from /usr/local/lib/python3.10/dist-packages/torch/include/torch/csrc/api/include/torch/autograd.h:3,
88.33                        from /usr/local/lib/python3.10/dist-packages/torch/include/torch/csrc/api/include/torch/all.h:7,
88.33                        from /usr/local/lib/python3.10/dist-packages/torch/include/torch/csrc/api/include/torch/torch.h:3,
88.33                        from ctcdecode/src/binding.cpp:5:
88.33       /usr/local/lib/python3.10/dist-packages/torch/include/c10/util/C++17.h:27:2: error: #error You need C++17 to compile PyTorch 

Bumping up the C++ standard from 14 to 17 in the setup.py's compile flags doesn't seem to fix it.

https://github.com/DewiBrynJones/ctcdecode/blob/master/setup.py#L57

I have gcc 11.4 on Ubuntu 22.04, (which does support c++17)

Only pre-installing torch==2.01 fixes the setup error for the time being.

Thanks!

[DewiBrynJones]

The fix in #231 by @WayenVan works. Thank you so much!