Use CMake variables to enable sub-builds

What

This MR updates how the variables YARR_FRONT_ENDS_TO_BUILD and YARR_CONTROLLERS_TO_BUILD (here), such that whatever these variables are set as will be used to fill the FRONT_ENDS and CONTROLLERS variables. The FRONT_ENDS and CONTROLLERS variables are ultimately what are used to define which libraries get built.

This allows a user to do, e.g., :

$ cmake3 -DYARR_FRONT_ENDS_TO_BUILD=Rd53b -DCONTROLLERS_TO_BUILD=Spec ..
...
-- Building controller Spec
-- Building frontend Rd53b
...

By default, the same behavior (in terms of what libraries are built by default) as previous will be the result:

$ cmake3 ..
...
-- Building controller Spec
-- Building controller Emu
-- Building frontend Fei4
-- Building frontend Rd53a
-- Building frontend Star
-- Building frontend Fe65p2
-- Building frontend Rd53b
...

Related Issues

• #135 (closed)