cmake/DownloadFolly.cmake

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## Download facebook's folly library. 
## SOURCE_DIR is typically the cmake source directory
## BUILD_DIR is the build directory, typically 'build'

function(download_folly SOURCE_DIR BUILD_DIR)
   
  if (DOWNLOAD_DEPENDENCIES)
    # Add custom boost include and lib paths.
    set(CFLAGS "-fPIC -I${BOOST_ROOT}/include -lboost_context -lboost_coroutine -l${CMAKE_DL_LIBS}")
    set(CXXFLAGS "${CMAKE_CXX_FLAGS} -fPIC -I${BOOST_ROOT}/include -lboost_context -lboost_coroutine -l${CMAKE_DL_LIBS}")
    set(LDFLAGS "-L${BOOST_ROOT}/lib")
    set(CONFIGURE_CMD ./configure --prefix=${BUILD_DIR}/dependencies/facebook-folly-proj-install
      --with-boost-libdir=${BOOST_ROOT}/lib CFLAGS=${CFLAGS} CXXFLAGS=${CXXFLAGS} LDFLAGS=${LDFLAGS})
  else()
    set(CFLAGS "-fPIC -lboost_context -lboost_coroutine -l${CMAKE_DL_LIBS}")
    set(CXXFLAGS "${CMAKE_CXX_FLAGS} -fPIC -lboost_context -lboost_coroutine -l${CMAKE_DL_LIBS}")
    set(CONFIGURE_CMD ./configure --prefix=${BUILD_DIR}/dependencies/facebook-folly-proj-install CFLAGS=${CFLAGS} CXXFLAGS=${CXXFLAGS})
  endif()

  ExternalProject_Add(
      facebook-folly-proj
      # TODO: Source version information from cmake file.
      URL "https://github.com/facebook/folly/archive/v2017.09.04.00.tar.gz"
      PREFIX "${BUILD_DIR}/dependencies"
      SOURCE_DIR "${BUILD_DIR}/dependencies/facebook-folly-proj-src"
      BINARY_DIR ${BUILD_DIR}/dependencies/facebook-folly-proj-src/folly
      CONFIGURE_COMMAND autoreconf -ivf COMMAND ${CONFIGURE_CMD}
      UPDATE_COMMAND ""
  )
  set(FOLLY_ROOT_DIR "${BUILD_DIR}/dependencies/facebook-folly-proj-install" CACHE STRING "" FORCE)
endfunction(download_folly)