#!/bin/bash
# Helper script to build graphbolt libraries for PyTorch
set -e

mkdir -p build
mkdir -p $BINDIR/graphbolt
cd build

if [ $(uname) = 'Darwin' ]; then
  CPSOURCE=*.dylib
else
  CPSOURCE=*.so
fi

# We build for the same architectures as DGL, thus we hardcode
# TORCH_CUDA_ARCH_LIST and we need to at least compile for Volta. Until
# https://github.com/NVIDIA/cccl/issues/1083 is resolved, we need to compile the
# cuda/extension folder with Volta+ CUDA architectures.
TORCH_CUDA_ARCH_LIST="Volta"
if ! [[ -z "${CUDAARCHS}" ]]; then
  # The architecture list is passed as an environment variable, we set
  # TORCH_CUDA_ARCH_LIST to the latest architecture.
  CUDAARCHSARR=(${CUDAARCHS//;/ })
  LAST_ARCHITECTURE=${CUDAARCHSARR[-1]}
  # TORCH_CUDA_ARCH_LIST has to be at least 70 to override Volta default.
  if (( $LAST_ARCHITECTURE >= 70 )); then
    # Convert "75" to "7.5".
    TORCH_CUDA_ARCH_LIST=${LAST_ARCHITECTURE:0:-1}'.'${LAST_ARCHITECTURE: -1}
  fi
fi
CMAKE_FLAGS="-DCUDA_TOOLKIT_ROOT_DIR=$CUDA_TOOLKIT_ROOT_DIR -DUSE_CUDA=$USE_CUDA -DGPU_CACHE_BUILD_DIR=$BINDIR -DTORCH_CUDA_ARCH_LIST=$TORCH_CUDA_ARCH_LIST"
echo $CMAKE_FLAGS

if [ $# -eq 0 ]; then
  $CMAKE_COMMAND $CMAKE_FLAGS ..
  make -j
  cp -v $CPSOURCE $BINDIR/graphbolt
else
  for PYTHON_INTERP in $@; do
    TORCH_VER=$($PYTHON_INTERP -c 'import torch; print(torch.__version__.split("+")[0])')
    mkdir -p $TORCH_VER
    cd $TORCH_VER
    $CMAKE_COMMAND $CMAKE_FLAGS -DPYTHON_INTERP=$PYTHON_INTERP ../..
    make -j
    cp -v $CPSOURCE $BINDIR/graphbolt
    cd ..
  done
fi