How to pass CMake cache variable to app configure step?

[irowebbn]

It seems that due to the two-tier nature of the cFE build system (CMake generate step for the mission called within mission_build.cmake), cache variables defined at cmake invokation are not passed on to individual apps. The only variables accessible are the ones written to mission_vars.cache, namely:

"MISSION_NAME"
"SIMULATION"
"MISSION_DEFS"
"MISSION_SOURCE_DIR"
"MISSION_BINARY_DIR"
"MISSIONCONFIG"
"MISSION_APPS"
"MISSION_PSPMODULES"
"MISSION_DEPS"
"ENABLE_UNIT_TESTS"
"${APP}_MISSION_DIR"
"BUILD_CONFIG_${SYSVAR}"

For example, we can set -DENABLE_UNIT_TEST and that will be available to use in an app's CMakeLists.txt, but passing -DENABLE_MYAPP_OPTIONAL_TESTS will have no effect, and ENABLE_MY_APP_OPTIONAL_TESTS will not be defined in the CMakeLists.txt

Is there any way around this?