| # Adds version control information to the variable VERS. For | 
 | # determining the Version Control System used (if any) it inspects the | 
 | # existence of certain subdirectories under CMAKE_CURRENT_SOURCE_DIR. | 
 |  | 
 | function(add_version_info_from_vcs VERS) | 
 |   set(result ${${VERS}}) | 
 |   if( EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/.svn" ) | 
 |     set(result "${result}svn") | 
 |     # FindSubversion does not work with symlinks. See PR 8437 | 
 |     if( NOT IS_SYMLINK "${CMAKE_CURRENT_SOURCE_DIR}" ) | 
 |       find_package(Subversion) | 
 |     endif() | 
 |     if( Subversion_FOUND ) | 
 |       subversion_wc_info( ${CMAKE_CURRENT_SOURCE_DIR} Project ) | 
 |       if( Project_WC_REVISION ) | 
 |         set(result "${result}-r${Project_WC_REVISION}") | 
 |       endif() | 
 |     endif() | 
 |   elseif( EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/.git ) | 
 |     set(result "${result}git") | 
 |     # Try to get a ref-id | 
 |     find_program(git_executable NAMES git git.exe git.cmd) | 
 |     if( git_executable ) | 
 |       execute_process(COMMAND ${git_executable} show-ref HEAD | 
 |                       WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} | 
 |                       TIMEOUT 5 | 
 |                       RESULT_VARIABLE git_result | 
 |                       OUTPUT_VARIABLE git_output) | 
 |       if( git_result EQUAL 0 ) | 
 |         string(SUBSTRING ${git_output} 0 7 git_ref_id) | 
 |         set(result "${result}-${git_ref_id}") | 
 |       else() | 
 |         execute_process(COMMAND ${git_executable} svn log --limit=1 --oneline | 
 |                         WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} | 
 |                         TIMEOUT 5 | 
 |                         RESULT_VARIABLE git_result | 
 |                         OUTPUT_VARIABLE git_output) | 
 |         if( git_result EQUAL 0 ) | 
 |           string(REGEX MATCH r[0-9]+ git_svn_rev ${git_output}) | 
 |           set(result "${result}-svn-${git_svn_rev}") | 
 |         endif() | 
 |       endif() | 
 |     endif() | 
 |   endif() | 
 |   set(${VERS} ${result} PARENT_SCOPE) | 
 | endfunction(add_version_info_from_vcs) |