Since I've been using engineering releases of XTC 15.3 with XCommon CMake built in, I've hit situations where I run the tests locally and it doesn't use my local changes in xcommon_cmake because the XMOS_CMAKE_PATH variable is already set to point to the tools installation. I don't think there is a need to be able to override this and we should always test using the local xcommon_cmake codebase.
Since I've been using engineering releases of XTC 15.3 with XCommon CMake built in, I've hit situations where I run the tests locally and it doesn't use my local changes in xcommon_cmake because the XMOS_CMAKE_PATH variable is already set to point to the tools installation. I don't think there is a need to be able to override this and we should always test using the local xcommon_cmake codebase.