pytorch

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# FindTorch
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# -------
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#
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# Finds the Torch library
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#
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# This will define the following variables:
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#
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#   TORCH_FOUND        -- True if the system has the Torch library
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#   TORCH_INCLUDE_DIRS -- The include directories for torch
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#   TORCH_LIBRARIES    -- Libraries to link against
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#   TORCH_CXX_FLAGS    -- Additional (required) compiler flags
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#
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# and the following imported targets:
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#
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#   torch
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macro(append_torchlib_if_found)
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  foreach (_arg ${ARGN})
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    find_library(${_arg}_LIBRARY ${_arg} PATHS "${TORCH_INSTALL_PREFIX}/lib")
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    if(${_arg}_LIBRARY)
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      list(APPEND TORCH_LIBRARIES ${${_arg}_LIBRARY})
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    else()
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      message(WARNING "static library ${${_arg}_LIBRARY} not found.")
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    endif()
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  endforeach()
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endmacro()
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macro(append_wholearchive_lib_if_found)
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  foreach (_arg ${ARGN})
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    find_library(${_arg}_LIBRARY ${_arg} PATHS "${TORCH_INSTALL_PREFIX}/lib")
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    if(${_arg}_LIBRARY)
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      if(APPLE)
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        list(APPEND TORCH_LIBRARIES "-Wl,-force_load,${${_arg}_LIBRARY}")
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      elseif(MSVC)
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        list(APPEND TORCH_LIBRARIES "-WHOLEARCHIVE:${${_arg}_LIBRARY}")
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      else()
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        # Linux
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        list(APPEND TORCH_LIBRARIES "-Wl,--whole-archive ${${_arg}_LIBRARY} -Wl,--no-whole-archive")
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      endif()
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    else()
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      message(WARNING "static library ${${_arg}_LIBRARY} not found.")
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    endif()
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  endforeach()
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endmacro()
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include(FindPackageHandleStandardArgs)
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if(DEFINED ENV{TORCH_INSTALL_PREFIX})
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  set(TORCH_INSTALL_PREFIX $ENV{TORCH_INSTALL_PREFIX})
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else()
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  # Assume we are in <install-prefix>/share/cmake/Torch/TorchConfig.cmake
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  get_filename_component(CMAKE_CURRENT_LIST_DIR "${CMAKE_CURRENT_LIST_FILE}" PATH)
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  get_filename_component(TORCH_INSTALL_PREFIX "${CMAKE_CURRENT_LIST_DIR}/../../../" ABSOLUTE)
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endif()
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# Include directories.
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if(EXISTS "${TORCH_INSTALL_PREFIX}/include")
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  set(TORCH_INCLUDE_DIRS
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    ${TORCH_INSTALL_PREFIX}/include
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    ${TORCH_INSTALL_PREFIX}/include/torch/csrc/api/include)
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else()
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  set(TORCH_INCLUDE_DIRS
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    ${TORCH_INSTALL_PREFIX}/include
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    ${TORCH_INSTALL_PREFIX}/include/torch/csrc/api/include)
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endif()
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# Library dependencies.
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if(@BUILD_SHARED_LIBS@)
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  find_package(Caffe2 REQUIRED PATHS ${CMAKE_CURRENT_LIST_DIR}/../Caffe2)
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  set(TORCH_LIBRARIES torch ${Caffe2_MAIN_LIBS})
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  append_torchlib_if_found(c10)
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else()
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  add_library(torch STATIC IMPORTED) # set imported_location at the bottom
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  #library need whole archive
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  append_wholearchive_lib_if_found(torch torch_cpu)
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  if(@USE_CUDA@)
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    append_wholearchive_lib_if_found(torch_cuda c10_cuda)
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  endif()
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  # We need manually add dependent libraries when they are not linked into the
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  # shared library.
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  # TODO: this list might be incomplete.
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  append_torchlib_if_found(c10)
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  if(@USE_NNPACK@)
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    append_torchlib_if_found(nnpack)
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  endif()
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  if(@USE_PYTORCH_QNNPACK@)
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    append_torchlib_if_found(pytorch_qnnpack)
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  endif()
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  if(@USE_XNNPACK@)
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    append_torchlib_if_found(XNNPACK)
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  endif()
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  append_torchlib_if_found(caffe2_protos protobuf-lite protobuf protoc)
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  append_torchlib_if_found(onnx onnx_proto)
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  append_torchlib_if_found(fmt)
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  append_torchlib_if_found(cpuinfo clog)
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  if(NOT @USE_INTERNAL_PTHREADPOOL_IMPL@)
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    append_torchlib_if_found(pthreadpool)
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  endif()
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  append_torchlib_if_found(eigen_blas)
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  if(@USE_FBGEMM@)
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    append_torchlib_if_found(fbgemm)
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  endif()
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  if(@USE_MKLDNN@)
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    append_torchlib_if_found(dnnl mkldnn)
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  endif()
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  append_torchlib_if_found(sleef asmjit)
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endif()
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if(@USE_KINETO@)
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  append_torchlib_if_found(kineto)
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endif()
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if(@USE_CUDA@)
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  if(MSVC)
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    find_library(CAFFE2_NVRTC_LIBRARY caffe2_nvrtc PATHS "${TORCH_INSTALL_PREFIX}/lib")
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    list(APPEND TORCH_CUDA_LIBRARIES ${CAFFE2_NVRTC_LIBRARY})
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  else()
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    set(TORCH_CUDA_LIBRARIES ${CUDA_NVRTC_LIB})
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  endif()
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  if(TARGET torch::nvtoolsext)
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    list(APPEND TORCH_CUDA_LIBRARIES torch::nvtoolsext)
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  endif()
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  if(@BUILD_SHARED_LIBS@)
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    find_library(C10_CUDA_LIBRARY c10_cuda PATHS "${TORCH_INSTALL_PREFIX}/lib")
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    list(APPEND TORCH_CUDA_LIBRARIES ${C10_CUDA_LIBRARY} ${Caffe2_PUBLIC_CUDA_DEPENDENCY_LIBS})
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  endif()
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  list(APPEND TORCH_LIBRARIES ${TORCH_CUDA_LIBRARIES})
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endif()
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# When we build libtorch with the old libstdc++ ABI, dependent libraries must too.
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if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
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  set(TORCH_CXX_FLAGS "-D_GLIBCXX_USE_CXX11_ABI=@GLIBCXX_USE_CXX11_ABI@")
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endif()
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find_library(TORCH_LIBRARY torch PATHS "${TORCH_INSTALL_PREFIX}/lib")
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# the statements below changes target properties on
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# - the imported target from Caffe2Targets.cmake in shared library mode (see the find_package above)
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#    - this is untested whether it is the correct (or desired) methodology in CMake
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# - the imported target created in this file in static library mode
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if(NOT @BUILD_SHARED_LIBS@)
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  # do not set this property on the shared library target, as it will cause confusion in some builds
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  # as the configuration specific property is set in the Caffe2Targets.cmake file
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  set_target_properties(torch PROPERTIES
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      IMPORTED_LOCATION "${TORCH_LIBRARY}"
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  )
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endif()
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set_target_properties(torch PROPERTIES
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    INTERFACE_INCLUDE_DIRECTORIES "${TORCH_INCLUDE_DIRS}"
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    CXX_STANDARD 17
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)
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if(TORCH_CXX_FLAGS)
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  set_property(TARGET torch PROPERTY INTERFACE_COMPILE_OPTIONS "${TORCH_CXX_FLAGS}")
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endif()
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find_package_handle_standard_args(Torch DEFAULT_MSG TORCH_LIBRARY TORCH_INCLUDE_DIRS)
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