Gate omp install

Author: Jack-Khuu

torchchat/utils/scripts/build_native.sh

@@ -86,14 +86,16 @@ if [[ "$TARGET" == "et" ]]; then
     EXECUTORCH_LIBRARIES="${TORCHCHAT_ROOT}/${ET_BUILD_DIR}/install/lib/libexecutorch_no_prim_ops.a;${TORCHCHAT_ROOT}/${ET_BUILD_DIR}/install/lib/libextension_threadpool.a;${TORCHCHAT_ROOT}/${ET_BUILD_DIR}/install/lib/libcpuinfo.a;${TORCHCHAT_ROOT}/${ET_BUILD_DIR}/install/lib/libpthreadpool.a"
     install_torchao_executorch_ops
   fi
+elif [[ "$LINK_TORCHAO_OPS" == "ON" ]]; then
+  # Install OMP when using AOTI with linked torchao ops
+  brew install libomp
 fi
 popd
 
 # CMake commands
 if [[ "$TARGET" == "et" ]]; then
     cmake -S . -B ./cmake-out -DCMAKE_PREFIX_PATH=`python3 -c 'import torch;print(torch.utils.cmake_prefix_path)'` -DLINK_TORCHAO_OPS="${LINK_TORCHAO_OPS}" -DET_USE_ADAPTIVE_THREADS=ON -DCMAKE_CXX_FLAGS="-D_GLIBCXX_USE_CXX11_ABI=1" -G Ninja
 else
-    brew install libomp
     cmake -S . -B ./cmake-out -DCMAKE_PREFIX_PATH=`python3 -c 'import torch;print(torch.utils.cmake_prefix_path)'` -DLINK_TORCHAO_OPS="${LINK_TORCHAO_OPS}" -DCMAKE_CXX_FLAGS="-D_GLIBCXX_USE_CXX11_ABI=1" -G Ninja
 fi
 cmake --build ./cmake-out --target "${TARGET}"_run