Compilation issues [AppleClang 10 on macOS, clang-8 & CUDA 10 on Ubuntu]

[mitsuba-renderer]

Compilation issues [AppleClang 10 on macOS, clang-8 & CUDA 10 on Ubuntu]

[merlinND]

Hi @theNded,

For the very first configuration (macOS), the errors that you are seeing are simply due to out-of-date docstrings in the file docstr.h. These docstrings are used by the python bindings only.
In principle we always commit the updated docstrings when adding new bindings, but sometimes we forget. If you encounter such an issue, there are two easy options:

1. Re-generate the updated docstrings yourself: ninja docstrings
2. Or temporarily disable the Python binding that uses that docstring (you can find out which one from the compiler error message).

Note that there is currently a limitation in the docstrings generation process: if you generate them for a given set of compilation option (e.g. autodiff disabled), the autodiff-related docstrings will be missing when turning it on.

[theNded]

It worked, thanks!
Also figured out the correct settings in Ubuntu: I need to reset g++ to the default low version so that nvcc won't complain, then use clang++8 for compilation.

[theNded]

Hi, sorry to bother again.
Now with make docstrings it can compile on both platforms without autodiff. But with autodiff I still cannot overcome a compilation problem. Any idea what's going on?
Thanks!

[ 36%] Building CXX object src/librender/CMakeFiles/mitsuba-render-obj.dir/scene.cpp.o
In file included from /home/wei/Workspace/code/mitsuba2/src/librender/scene.cpp:3:
In file included from /home/wei/Workspace/code/mitsuba2/include/mitsuba/render/bsdf.h:3:
In file included from /home/wei/Workspace/code/mitsuba2/include/mitsuba/render/interaction.h:4:
In file included from /home/wei/Workspace/code/mitsuba2/include/mitsuba/core/spectrum.h:8:
In file included from /home/wei/Workspace/code/mitsuba2/include/mitsuba/core/simd.h:4:
In file included from /home/wei/Workspace/code/mitsuba2/ext/enoki/include/enoki/array.h:30:
In file included from /home/wei/Workspace/code/mitsuba2/ext/enoki/include/enoki/array_generic.h:14:
In file included from /home/wei/Workspace/code/mitsuba2/ext/enoki/include/enoki/array_static.h:3:
In file included from /home/wei/Workspace/code/mitsuba2/ext/enoki/include/enoki/array_base.h:16:
/home/wei/Workspace/code/mitsuba2/ext/enoki/include/enoki/array_struct.h:86:35: error: no member named 'scatter' in 'enoki::struct_support<enoki::Matrix<mitsuba::Spectrum<enoki::DiffArray<CUDAArray<float>
      > >, 4, true>, int>'
        struct_support_t<Target>::scatter(target, value, index, mask);
        ~~~~~~~~~~~~~~~~~~~~~~~~~~^
/home/wei/Workspace/code/mitsuba2/ext/enoki/include/enoki/stl.h:77:16: note: in instantiation of function template specialization 'enoki::scatter<0, true, false,
      enoki::Matrix<mitsuba::Spectrum<enoki::DiffArray<CUDAArray<float> > >, 4, true>, enoki::DiffArray<enoki::CUDAArray<unsigned int> >, enoki::Matrix<mitsuba::Spectrum<enoki::DiffArray<CUDAArray<float>
      > >, 4, true>, enoki::DiffArray<enoki::CUDAArray<bool> >, 0>' requested here
        enoki::scatter(dst.second, value.second, index, mask);
               ^
/home/wei/Workspace/code/mitsuba2/ext/enoki/include/enoki/array_struct.h:86:35: note: in instantiation of function template specialization
      'enoki::struct_support<std::__1::pair<mitsuba::DirectionSample<mitsuba::Point<enoki::DiffArray<CUDAArray<float> >, 3> >, enoki::Matrix<mitsuba::Spectrum<enoki::DiffArray<CUDAArray<float> > >, 4,
      true> >, int>::scatter<std::__1::pair<mitsuba::DirectionSample<mitsuba::Point<enoki::DiffArray<CUDAArray<float> >, 3> >, enoki::Matrix<mitsuba::Spectrum<enoki::DiffArray<CUDAArray<float> > >, 4,
      true> >, enoki::DiffArray<enoki::CUDAArray<unsigned int> >, enoki::DiffArray<enoki::CUDAArray<bool> > >' requested here
        struct_support_t<Target>::scatter(target, value, index, mask);
                                  ^
/home/wei/Workspace/code/mitsuba2/ext/enoki/include/enoki/array_call.h:162:25: note: in instantiation of function template specialization 'enoki::scatter<0, true, true,
      std::__1::pair<mitsuba::DirectionSample<mitsuba::Point<enoki::DiffArray<CUDAArray<float> >, 3> >, enoki::Matrix<mitsuba::Spectrum<enoki::DiffArray<CUDAArray<float> > >, 4, true> >,
      enoki::DiffArray<enoki::CUDAArray<unsigned int> >, std::__1::pair<mitsuba::DirectionSample<mitsuba::Point<enoki::DiffArray<CUDAArray<float> >, 3> >,
      enoki::Matrix<mitsuba::Spectrum<enoki::DiffArray<CUDAArray<float> > >, 4, true> >, enoki::DiffArray<enoki::CUDAArray<bool> >, 0>' requested here
                        scatter<0, true, true>(result, temp, permutation);
                        ^
/home/wei/Workspace/code/mitsuba2/src/librender/scene.cpp:284:12: note: in instantiation of function template specialization
      'mitsuba::Scene::sample_emitter_direction_pol_impl<mitsuba::Interaction<mitsuba::Point<enoki::DiffArray<CUDAArray<float> >, 3> >, enoki::DiffArray<CUDAArray<float> >,
      mitsuba::Spectrum<enoki::DiffArray<CUDAArray<float> > >, mitsuba::Point<enoki::DiffArray<CUDAArray<float> >, 3>, mitsuba::Point<enoki::DiffArray<CUDAArray<float> >, 2>,
      mitsuba::DirectionSample<mitsuba::Point<enoki::DiffArray<CUDAArray<float> >, 3> >, enoki::DiffArray<enoki::CUDAArray<bool> >, enoki::Matrix<mitsuba::Spectrum<enoki::DiffArray<CUDAArray<float> > >,
      4, true> >' requested here
    return sample_emitter_direction_pol_impl(ref, sample, test_visibility, active);
           ^
1 error generated.

[wjakob]

Hi Wei, can you update to the autodiff-plain branch? Master has some commits related to polarization that broke autodiff.

[theNded]

Thanks @wjakob, it works!