cmake/Tests/CMakeOnly/MajorVersionSelection/CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

if (NOT MAJOR_TEST_MODULE OR NOT MAJOR_TEST_VERSION)
  message(FATAL_ERROR "test selection variables not set up")
endif ()

if (MAJOR_TEST_NO_LANGUAGES)
  project(major_detect_${MAJOR_TEST_MODULE}_${MAJOR_TEST_VERSION} NONE)
else ()
  project(major_detect_${MAJOR_TEST_MODULE}_${MAJOR_TEST_VERSION})
endif ()

find_package(${MAJOR_TEST_MODULE} ${MAJOR_TEST_VERSION})

if (MAJOR_TEST_VERSION_VAR)
  set(VERSION_VAR "${MAJOR_TEST_VERSION_VAR}")
else ()
  set(VERSION_VAR "${MAJOR_TEST_MODULE}_VERSION_STRING")
endif ()

string(TOUPPER "${MAJOR_TEST_MODULE}" MODULE_UPPER)

if ( ( ${MAJOR_TEST_MODULE}_FOUND OR ${MODULE_UPPER}_FOUND ) AND ${VERSION_VAR})
  message(STATUS "${VERSION_VAR} is '${${VERSION_VAR}}'")
  if (${VERSION_VAR} VERSION_LESS MAJOR_TEST_VERSION)
    message(SEND_ERROR "Found version ${${VERSION_VAR}} is less than requested major version ${MAJOR_TEST_VERSION}")
  endif ()
  math(EXPR V_PLUS_ONE "${MAJOR_TEST_VERSION} + 1")
  if (${VERSION_VAR} VERSION_GREATER V_PLUS_ONE)
    message(SEND_ERROR "Found version ${${VERSION_VAR}} is greater than requested major version ${MAJOR_TEST_VERSION}")
  endif ()
endif ()

if ( ( ${MAJOR_TEST_MODULE}_FOUND OR ${MODULE_UPPER}_FOUND ) AND ${MAJOR_TEST_MODULE}_VERSION_MAJOR)
  message(STATUS "${MAJOR_TEST_MODULE}_VERSION_MAJOR is '${${MAJOR_TEST_MODULE}_VERSION_MAJOR}'")
  if (NOT ${MAJOR_TEST_VERSION} EQUAL ${MAJOR_TEST_MODULE}_VERSION_MAJOR)
    message(SEND_ERROR "We requested major version ${MAJOR_TEST_VERSION} but ${MAJOR_TEST_MODULE} set ${MAJOR_TEST_MODULE}_VERSION_MAJOR to ${${MAJOR_TEST_MODULE}_VERSION_MAJOR}")
  endif ()
endif ()

if ( ( ${MAJOR_TEST_MODULE}_FOUND OR ${MODULE_UPPER}_FOUND ) AND ${MODULE_UPPER}_VERSION_MAJOR)
  message(STATUS "${MODULE_UPPER}_VERSION_MAJOR is '${${MODULE_UPPER}_VERSION_MAJOR}'")
  if (NOT ${MAJOR_TEST_VERSION} EQUAL ${MODULE_UPPER}_VERSION_MAJOR)
    message(SEND_ERROR "We requested major version ${MAJOR_TEST_VERSION} but ${MAJOR_TEST_MODULE} set ${MODULE_UPPER}_VERSION_MAJOR to ${${MODULE_UPPER}_VERSION_MAJOR}")
  endif ()
endif ()