1# The utility function DetermineOSVersion aims at providing an
2# improved version of the CMake variable ${CMAKE_SYSTEM} on Windows
3# machines.
4#
5# Usage:
6#  include(EigenDetermineOSVersion)
7#  DetermineOSVersion(OS_VERSION)
8#  message("OS: ${OS_VERSION}")
9
10# - A little helper variable which should not be directly called
11function(DetermineShortWindowsName WIN_VERSION win_num_version)
12   if    (${win_num_version} VERSION_EQUAL "6.1")
13       set(_version "win7")
14   elseif(${win_num_version} VERSION_EQUAL "6.0")
15       set(_version "winVista")
16   elseif(${win_num_version} VERSION_EQUAL "5.2")
17       set(_version "winXpProf")
18   elseif(${win_num_version} VERSION_EQUAL "5.1")
19       set(_version "winXp")
20   elseif(${win_num_version} VERSION_EQUAL "5.0")
21       set(_version "win2000Prof")
22   else()
23       set(_version "unknownWin")
24   endif()
25   set(${WIN_VERSION} ${_version} PARENT_SCOPE)
26endfunction()
27
28function(DetermineOSVersion OS_VERSION)
29  if (WIN32)
30    file (TO_NATIVE_PATH "$ENV{COMSPEC}" SHELL)
31    exec_program( ${SHELL} ARGS "/c" "ver" OUTPUT_VARIABLE ver_output)
32
33      string(REGEX MATCHALL "[0-9]+"
34           ver_list "${ver_output}")
35      list(GET ver_list 0 _major)
36      list(GET ver_list 1 _minor)
37
38    set(win_num_version ${_major}.${_minor})
39    DetermineShortWindowsName(win_version "${win_num_version}")
40    if(win_version)
41      set(${OS_VERSION} ${win_version} PARENT_SCOPE)
42    endif()
43  else()
44    set(${OS_VERSION} ${CMAKE_SYSTEM} PARENT_SCOPE)
45  endif()
46endfunction()
47