cmake_minimum_required(VERSION 3.7.2)

project(protobuf-download NONE)

if("" STREQUAL "${LIBPROTOBUF_VERSION}")
  set(LIBPROTOBUF_VERSION v33.2)
  message(FATAL_ERROR "LIBPROTOBUF_VERSION not set, using default: ${D}{LIBPROTOBUF_VERSION}")
else()
  set(LIBPROTOBUF_VERSION ${LIBPROTOBUF_VERSION})
  message(STATUS "LIBPROTOBUF_VERSION set to: ${D}{LIBPROTOBUF_VERSION}")
endif()

include(ExternalProject)
ExternalProject_Add(protobuf
  GIT_REPOSITORY    https://github.com/protocolbuffers/protobuf.git
  GIT_TAG           "${D}{LIBPROTOBUF_VERSION}"
  SOURCE_DIR        "${CMAKE_BINARY_DIR}/protobuf-src"
  BINARY_DIR        "${CMAKE_BINARY_DIR}/protobuf-build"
  CONFIGURE_COMMAND ""
  BUILD_COMMAND     ""
  INSTALL_COMMAND   ""
  TEST_COMMAND      ""
)