Issue building for MacOS

[fmammoli]

Hi,

I am working on a MacOS with M3 Pro.
I am trying to build OpenSplat for MacOS but keep hitting an error while running.

cmake -DCMAKE_PREFIX_PATH=/Users/fmammoli/Developer/pythonprojs/libtorch/share/cmake/Torch -DGPU_RUNTIME=MPS .. && make -j$(sysctl -n hw.logicalcpu)

I get the error:

`
11 warnings generated.

[ 13%] Built target gsplat_metal
[ 18%] Linking CXX static library libgsplat.a
[ 18%] Built target gsplat
[ 22%] Linking CXX static library libgsplat_cpu.a
[ 22%] Built target gsplat_cpu
[ 31%] Building CXX object CMakeFiles/opensplat.dir/point_io.cpp.o
[ 31%] Building CXX object CMakeFiles/opensplat.dir/spherical_harmonics.cpp.o
[ 36%] Building CXX object CMakeFiles/opensplat.dir/nerfstudio.cpp.o
[ 40%] Building CXX object CMakeFiles/opensplat.dir/utils.cpp.o
[ 45%] Building CXX object CMakeFiles/opensplat.dir/project_gaussians.cpp.o
[ 50%] Building CXX object CMakeFiles/opensplat.dir/kdtree_tensor.cpp.o
[ 54%] Building CXX object CMakeFiles/opensplat.dir/model.cpp.o
[ 59%] Building CXX object CMakeFiles/opensplat.dir/opensplat.cpp.o
[ 63%] Building CXX object CMakeFiles/opensplat.dir/cv_utils.cpp.o
[ 72%] Building CXX object CMakeFiles/opensplat.dir/rasterize_gaussians.cpp.o
[ 72%] Building CXX object CMakeFiles/opensplat.dir/ssim.cpp.o
[ 77%] Building CXX object CMakeFiles/opensplat.dir/optim_scheduler.cpp.o
[ 81%] Building CXX object CMakeFiles/opensplat.dir/colmap.cpp.o
[ 86%] Building CXX object CMakeFiles/opensplat.dir/opensfm.cpp.o
[ 90%] Building CXX object CMakeFiles/opensplat.dir/input_data.cpp.o
[ 95%] Building CXX object CMakeFiles/opensplat.dir/tensor_math.cpp.o
[100%] Linking CXX executable opensplat
Undefined symbols for architecture arm64:
"c10::impl::cow::materialize_cow_storage(c10::StorageImpl&)", referenced from:
void* c10::TensorImpl::data_impl<void, c10::TensorImpl::mutable_data()::'lambda'()>(c10::TensorImpl::mutable_data()::'lambda'() const&) const in model.cpp.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [opensplat] Error 1
make[1]: *** [CMakeFiles/opensplat.dir/all] Error 2
make: *** [all] Error 2
`

I also tried running with the Pytorch path installed via Mamba and got the same error.
I managed to build by installing Pytorch via homebrew and using that path instead of libtorch path, but as I am new to python I am trying to keep my env under control the best I can.

What I am doing wrong?

[pfxuan]

It seems like there is a problem on the homebrew version of pytorch. Can you directly download libtorch instead? like

cd OpenSplat
wget https://download.pytorch.org/libtorch/cpu/libtorch-macos-arm64-2.2.1.zip
unzip libtorch-macos-arm64-2.2.1.zip
cd build
cmake -DCMAKE_PREFIX_PATH=../libtorch -DGPU_RUNTIME=MPS .. 

[fmammoli]

Directly downloading libtorch actually works and the build is done successfully after make -j$(sysctl -n hw.logicalcpu).
But when running ./openSplat now I get the error:

dyld[6669]: Library not loaded: @rpath/libomp.dylib
  Referenced from: <DD14EDEC-57EB-38BD-98C1-58FACE69BBEC> /Users/fmammoli/Developer/pythonprojs/libtorch/lib/libtorch_cpu.dylib
  Reason: tried: '/Users/runner/work/pytorch/pytorch/pytorch/build/lib/libomp.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/Users/runner/work/pytorch/pytorch/pytorch/build/lib/libomp.dylib' (no such file), '/Users/runner/work/_temp/anaconda/envs/wheel_py38/lib/libomp.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/Users/runner/work/_temp/anaconda/envs/wheel_py38/lib/libomp.dylib' (no such file), '/Users/runner/work/pytorch/pytorch/pytorch/build/lib/libomp.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/Users/runner/work/pytorch/pytorch/pytorch/build/lib/libomp.dylib' (no such file), '/Users/fmammoli/Developer/pythonprojs/libtorch/lib/libomp.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/Users/fmammoli/Developer/pythonprojs/libtorch/lib/libomp.dylib' (no such file), '/opt/homebrew/lib/libomp.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/opt/homebrew/lib/libomp.dylib' (no such file), '/Users/fmammoli/Developer/pythonprojs/libtorch/lib/libomp.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/Users/fmammoli/Developer/pythonprojs/libtorch/lib/libomp.dylib' (no such file), '/opt/homebrew/lib/libomp.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/opt/homebrew/lib/libomp.dylib' (no such file), '/usr/local/lib/libomp.dylib' (no such file), '/usr/lib/libomp.dylib' (no such file, not in dyld cache)
zsh: abort      ./opensplat

My libomp.dylib indeed is in none of these paths, I found it on /opt/homebrew/Cellar/libomp/18.1.8/lib/libomp.dylib

Is there a way to add this path?

[pfxuan]

Maybe you can try this:

export DYLD_LIBRARY_PATH=$(brew --prefix libomp)/lib:$DYLD_LIBRARY_PATH

[fmammoli]

Exporting the path didn't solve the issue, but creating a symlink did between the brew --prefix libomp path/lib/libomp.dylib and one of the suggested paths did.

I can now run the example datasets without error! Thanks!