set(INITIAL_SOURCE_DIR "${CMAKE_SOURCE_DIR}" CACHE PATH "defined in initial.cmake")
set(INITIAL_BINARY_DIR "${CMAKE_BINARY_DIR}" CACHE PATH "defined in initial.cmake")

message("initial-cache.txt: CMAKE_SOURCE_DIR: ${CMAKE_SOURCE_DIR}")
message("initial-cache.txt: CMAKE_BINARY_DIR: ${CMAKE_BINARY_DIR}")