[CMake] CMAKE_CACHE_MAJOR_VERSION not set yet during initial cmake run

[Wheeler, Frederick W (GE, Research)]

I'm trying to use CMAKE_CACHE_MAJOR_VERSION and
CMAKE_CACHE_MINOR_VERSION to determine which version of cmake is being
used, but it seems that these vars are not yet set during the first
cmake run.  This is demonstrated in a simple test case below.  CMake is
run twice, and you can see in the 'debug' prints are different on the
second cmake run.

Is there a better way to determine the cmake version being used?

Thanks,
Fred


0% cat CMakeLists.txt 
SET( VER "${CMAKE_CACHE_MAJOR_VERSION}.${CMAKE_CACHE_MINOR_VERSION}" )
MESSAGE("debug ${VER}")
IF( "${VER}" STRGREATER "2.5" )
  MESSAGE("debug NEW CMAKE")
ELSE( "${VER}" STRGREATER "2.5" )
  MESSAGE("debug OLD CMAKE")
ENDIF( "${VER}" STRGREATER "2.5" )

0% cmake --version
cmake version 2.6-patch 0

0% ls
CMakeLists.txt

0% cmake .
-- The C compiler identification is GNU
-- The CXX compiler identification is GNU
-- Check for working C compiler: /usr/bin/gcc.exe
-- Check for working C compiler: /usr/bin/gcc.exe -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++.exe
-- Check for working CXX compiler: /usr/bin/c++.exe -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
debug .
debug OLD CMAKE
-- Configuring done
-- Generating done
-- Build files have been written to: /cygdrive/d/home/wheeler/tmp_ver

0% cmake .
debug 2.6
debug NEW CMAKE
-- Configuring done
-- Generating done
-- Build files have been written to: /cygdrive/d/home/wheeler/tmp_ver