clean-all.cmake

set(cmake_generated ${CMAKE_BINARY_DIR}/CMakeCache.txt
  ${CMAKE_BINARY_DIR}/cmake_install.cmake
  ${CMAKE_BINARY_DIR}/Makefile
  ${CMAKE_BINARY_DIR}/CMakeFiles
  )

foreach(file ${cmake_generated})
  if (EXISTS ${file})
    file(REMOVE_RECURSE ${file})
  endif()
endforeach(file)