cmake_minimum_required(VERSION 2.8.12 FATAL_ERROR)

# Find the Caffe2 package.
# Caffe2 exports the required targets, so find_package should work for
# the standard Caffe2 installation. If you encounter problems with finding
# the Caffe2 package, make sure you have run `make install` when installing
# Caffe2 (`make install` populates your share/cmake/Caffe2).
find_package(Caffe2 REQUIRED)

if (${CAFFE2_VERSION} VERSION_LESS 0.8.2)
  # Pre-0.8.2 caffe2 does not have proper interface libraries set up, so we
  # will rely on the old path.
  message(WARNING
      "You are using an older version of Caffe2 (version " ${CAFFE2_VERSION}
      "). Please consider moving to a newer version.")
  include(cmake/legacy/legacymake.cmake)
  return()
endif()

# Add compiler flags.
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c11")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14 -O2 -fPIC -Wno-narrowing")

# Print configuration summary.
include(cmake/Summary.cmake)
detectron_print_config_summary()

# Collect custom ops sources.
file(GLOB CUSTOM_OPS_CPU_SRCS ${CMAKE_CURRENT_SOURCE_DIR}/detectron/ops/*.cc)
file(GLOB CUSTOM_OPS_GPU_SRCS ${CMAKE_CURRENT_SOURCE_DIR}/detectron/ops/*.cu)

# Install custom CPU ops lib.
add_library(
    caffe2_detectron_custom_ops SHARED
    ${CUSTOM_OPS_CPU_SRCS})

target_include_directories(
    caffe2_detectron_custom_ops PRIVATE
    ${CAFFE2_INCLUDE_DIRS})

target_link_libraries(caffe2_detectron_custom_ops caffe2_library)
install(TARGETS caffe2_detectron_custom_ops DESTINATION lib)

# Install custom GPU ops lib, if gpu is present.
if (CAFFE2_USE_CUDA OR CAFFE2_FOUND_CUDA)
  # Additional -I prefix is required for CMake versions before commit (< 3.7):
  # https://github.com/Kitware/CMake/commit/7ded655f7ba82ea72a82d0555449f2df5ef38594
  list(APPEND CUDA_INCLUDE_DIRS -I${CAFFE2_INCLUDE_DIRS})
  CUDA_ADD_LIBRARY(
      caffe2_detectron_custom_ops_gpu SHARED
      ${CUSTOM_OPS_CPU_SRCS}
      ${CUSTOM_OPS_GPU_SRCS})

  target_link_libraries(caffe2_detectron_custom_ops_gpu caffe2_gpu_library)
  install(TARGETS caffe2_detectron_custom_ops_gpu DESTINATION lib)
endif()