How to build libtorch on mac arm?

i downloaded libtorch and make these files on macbook pro ARM:

example-app/
     build/
     libtorch/
     CMakeLists.txt
     example-app.cpp

then i used these commands for build torch:

cmake -DCMAKE_PREFIX_PATH=/path-to-example-app/example-app/libtorch
make

and i get this error:

building for macOS-x86_64 but attempting to link with file built for unknown-arm64

can you help me?

Solution

I was able to build libtorch library from source on my Mac M1 and run the C++ example-app project that you are looking at

(https://medium.com/@albertsundjaja/installing-pytorch-c-api-d52c722f47ec)

I did it with the following steps:

% git clone -b master --recurse-submodule https://github.com/pytorch/pytorch.git
% mkdir pytorch-build
% cd pytorch-build 
% cmake -DBUILD_SHARED_LIBS:BOOL=ON -DCMAKE_BUILD_TYPE:STRING=Release -DPYTHON_EXECUTABLE:PATH=`which python3` -DCMAKE_INSTALL_PREFIX:PATH=../pytorch-install ../pytorch

% cmake --build . --target install

The above process creates a directory called pytorch-install. Copy files from the following directories in pytorch-install to respective directories in /example-app/libtorch/

bin
include
lib
share

Important Note: replace files not directories or some needed files from original libtorch will be lost.

Once I do this, I can run the following command per the tutorial:

% cmake -DCMAKE_PREFIX_PATH=/path-to-example-app/example-app/libtorch ..
    make

then running the command

% ./example-app

I get

 0.1816  0.6954  0.8272
 0.7898  0.0256  0.1385
[ CPUFloatType{2,3} ]