firebase-ios-sdk/cmake/external_rules.cmake

# Copyright 2018 Google
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

function(download_external_sources)
  file(MAKE_DIRECTORY ${PROJECT_BINARY_DIR}/external)
  execute_process(
    COMMAND
      ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}"
      -DFIREBASE_DOWNLOAD_DIR=${FIREBASE_DOWNLOAD_DIR}
      -DCMAKE_INSTALL_PREFIX=${FIREBASE_INSTALL_DIR}
      ${PROJECT_SOURCE_DIR}/cmake/external
    WORKING_DIRECTORY ${PROJECT_BINARY_DIR}/external
  )

  # Run downloads in parallel if we know how
  if(CMAKE_GENERATOR STREQUAL "Unix Makefiles")
    set(cmake_build_args -j)
  endif()

  execute_process(
    COMMAND ${CMAKE_COMMAND} --build . -- ${cmake_build_args}
    WORKING_DIRECTORY ${PROJECT_BINARY_DIR}/external
  )
endfunction()

function(add_external_subdirectory NAME)
  add_subdirectory(
    ${FIREBASE_BINARY_DIR}/external/src/${NAME}
    ${FIREBASE_BINARY_DIR}/external/src/${NAME}-build
    EXCLUDE_FROM_ALL
  )
endfunction()