[CMake] Forcing 'out-of-source' build

[Wylie, Brian]

Hi All,

I want to force an 'out-of-source' build for a small project that I converted to use Cmake.

I did a bit of searching and found variants of the following...

# Make sure the build is out of source
STRING(COMPARE EQUAL "${CMAKE_SOURCE_DIR}" "${CMAKE_BINARY_DIR}" insource)
  IF(insource)
    MESSAGE(FATAL_ERROR "Do not build in your source dir please :)")
  ENDIF(insource)


It works but it still generates a CMakeCache.txt file and a CMakeFiles directory in the source directory (which I've also seen others discussing)...  is there a more official way to block 'in-source' builds that leaves the source dir pristine?

  Brian Wylie - Org 1424
  Sandia National Laboratories
  MS 1323 - Building CSRI/242
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