[MESOS-3396] Fully separate out libprocess and Stout CMake build system from the Mesos build system

• Type: Task
• Status: Accepted
• Priority: Minor
• Resolution: Unresolved
• Component/s: cmake
• Labels: cmake mesosphere
• Target Version/s: 0.24.0
• Epic Link: cmake-improvements
• Assignee: Joseph Wu
• Reporter: Andrew Schwartzmeyer
• Shepherd: Joris Van Remoortere
• Created: 09/Sep/15 00:01
• Updated: 01/Jul/20 13:45

Description

The official goal is to be able to put libprocess and stout into a call to `ExternalProject_Add`, rather than having them built in-tree as they are now. Since Libprocess and Stout depend on a few variables being defined by the project that is building against it (such as, e.g., the `LINUX` variable) this will involve, at minimum, figuring out which `-D` flags have to be passed through the `ExternalProject_Add` call.

NOTE: This goal may not be feasible. We will need to trigger a rebuild of many source files if we change a header in Libprocess or Stout, and a relink if we change a .cpp file in the source files of Libprocess. This might require a fair bit of effort.

Another complication is that `StoutConfigure` manages the dependencies of Stout, and Stout is built through `ExternalProject_Add`, we will need to make sure this is managed in roughly the same way it is now.