CMake/Source/CMakeVersion.cmake

# CMake version number components.
set(CMake_VERSION_MAJOR 3)
set(CMake_VERSION_MINOR 16)
set(CMake_VERSION_PATCH 20200102)
#set(CMake_VERSION_RC 0)
set(CMake_VERSION_IS_DIRTY 0)

# Start with the full version number used in tags.  It has no dev info.
set(CMake_VERSION
  "${CMake_VERSION_MAJOR}.${CMake_VERSION_MINOR}.${CMake_VERSION_PATCH}")
if(DEFINED CMake_VERSION_RC)
  set(CMake_VERSION "${CMake_VERSION}-rc${CMake_VERSION_RC}")
endif()

# Releases define a small patch level.
if("${CMake_VERSION_PATCH}" VERSION_LESS 20000000)
  set(CMake_VERSION_IS_RELEASE 1)
else()
  set(CMake_VERSION_IS_RELEASE 0)
endif()

if(NOT CMake_VERSION_NO_GIT)
  # If this source was exported by 'git archive', use its commit info.
  set(git_info [==[$Format:%h %s$]==])

  # Otherwise, try to identify the current development source version.
  if(NOT git_info MATCHES "^([0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]?[0-9a-f]?)[0-9a-f]* "
      AND EXISTS ${CMake_SOURCE_DIR}/.git)
    find_package(Git QUIET)
    if(GIT_FOUND)
      macro(_git)
        execute_process(
          COMMAND ${GIT_EXECUTABLE} ${ARGN}
          WORKING_DIRECTORY ${CMake_SOURCE_DIR}
          RESULT_VARIABLE _git_res
          OUTPUT_VARIABLE _git_out OUTPUT_STRIP_TRAILING_WHITESPACE
          ERROR_VARIABLE _git_err ERROR_STRIP_TRAILING_WHITESPACE
          )
      endmacro()
    endif()
    if(COMMAND _git)
      # Get the commit checked out in this work tree.
      _git(log -n 1 HEAD "--pretty=format:%h %s" --)
      set(git_info "${_git_out}")
    endif()
  endif()

  # Extract commit information if available.
  if(git_info MATCHES "^([0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]?[0-9a-f]?)[0-9a-f]* (.*)$")
    # Have commit information.
    set(git_hash "${CMAKE_MATCH_1}")
    set(git_subject "${CMAKE_MATCH_2}")

    # If this is not the exact commit of a release, add dev info.
    if(NOT "${git_subject}" MATCHES "^[Cc][Mm]ake ${CMake_VERSION}$")
      set(CMake_VERSION "${CMake_VERSION}-g${git_hash}")
    endif()

    # If this is a work tree, check whether it is dirty.
    if(COMMAND _git)
      _git(update-index -q --refresh)
      _git(diff-index --name-only HEAD --)
      if(_git_out)
        set(CMake_VERSION_IS_DIRTY 1)
      endif()
    endif()
  else()
    # No commit information.
    if(NOT CMake_VERSION_IS_RELEASE)
      # Generic development version.
      set(CMake_VERSION "${CMake_VERSION}-git")
    endif()
  endif()
endif()

# Extract the version suffix component.
if(CMake_VERSION MATCHES "-(.*)$")
  set(CMake_VERSION_SUFFIX "${CMAKE_MATCH_1}")
else()
  set(CMake_VERSION_SUFFIX "")
endif()
if(CMake_VERSION_IS_DIRTY)
  set(CMake_VERSION ${CMake_VERSION}-dirty)
endif()