cmake/DownloadBoost.cmake

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## Download Boost. 
## SOURCE_DIR is typically the cmake source directory
## BINARY_DIR is the build directory, typically 'build'
## Sets BOOST_ROOT, search prefix for FindBoost.

function(download_boost SOURCE_DIR BUILD_DIR BOOST_LIBS)
  set(BOOST_DOWNLOAD_DIR "${BUILD_DIR}/dependencies/boost-download")
  set(BOOST_SOURCE_DIR "${BUILD_DIR}/dependencies/boost-src")
  set(BOOST_INSTALL_DIR "${BUILD_DIR}/dependencies/boost-install")

  set(CFLAGS "-fPIC")
  set(CXXFLAGS "${CMAKE_CXX_FLAGS} -fPIC")

  # Only compile and install the needed libs.
  set(LIBS_TO_COMPILE "")
  foreach(lib ${BOOST_LIBS})
    string(APPEND LIBS_TO_COMPILE --with-${lib} " ")
  endforeach()

  separate_arguments(BUILD_CMD UNIX_COMMAND
    "./b2 cflags='${CFLAGS}' cxxflags='${CXXFLAGS}' variant=release link=static threading=multi ${LIBS_TO_COMPILE} install")

  ExternalProject_Add(boost
     URL "https://dl.bintray.com/boostorg/release/1.65.1/source/boost_1_65_1.tar.gz"
     PREFIX "${BUILD_DIR}/dependencies"
     DOWNLOAD_DIR ${BOOST_DOWNLOAD_DIR}
     BUILD_IN_SOURCE true
     SOURCE_DIR ${BOOST_SOURCE_DIR}
     INSTALL_DIR ${BOOST_INSTALL_DIR}
     CONFIGURE_COMMAND ./bootstrap.sh --prefix=${BOOST_INSTALL_DIR}
     BUILD_COMMAND ${BUILD_CMD}
     INSTALL_COMMAND ""
  )
  set(BOOST_ROOT ${BOOST_INSTALL_DIR} PARENT_SCOPE)
endfunction(download_boost)