warning when link_with(x) is used without depends_on(x) if x is in local tree

[podusowski]

To link with internal lib you have to write:

target application app link_with(some_local_library pthread) depends_on(some_local_library)

now, we have to options to avoid potential errors when someone forgets about depends_on attribute: make it implicit when link_with elements are in the tree, or give a warning when it is but depends_on is not there.

[salwator]

Why not auto-link with everything target depends on?

[podusowski]

Because you can depend on something which is not a library, for example, in rusted I have 2 app targets: Server and ServerSCT which depends on it, ServerSCT also depends on some phonys which generate sqlite db (those can be C++ generators or anything else in that matter). Too many cases would not be covered this way, besides, I think it's better to depends_on than link something implicitly.