[CMake] Target properties, dependencies and subdirs order?

[Jeroen Janssen]

Hi,

I have a question on the evaluation/creation of target properties in
relation with dependencies.

Example:
<topdir>
   TestDll     directory with interface/ and src/
   TestExe   directory with src/

TestExe has a dependency to TestDll (with add_dependency)

Now I would like to add the interface directory of TestDll to the
include paths of TestExe (based on the target properties of TestDll).
Note that for this 'small' example I could probably 'short-circuit'
things, but this way is the easiest to explain one of the conceptual
problems we have.

I found a 'subdirectory-order-dependency' problem that I need to
understand/find a solution to:

When performing GET_TARGET_PROPERTY( TestSO_INTERFACEDIR TestDll
LOCATION), this only works when <topdir> has TestDll before TestExe in
the SUBDIRS section. If TestDll is after TestExe (e.g. "SUBDIRS(
TestExe TestDll)" ), the GET_TARGET_PROPERTY fails on TestDll
(resulting in NOTFOUND).

Now I would rather not have any dependency/order information in the
topdir CMakeLists.txt. I was hoping that "add_dependencies" would make
sure information got evaluated in the "right order".

Is there anyone doing something similar?
Any thoughts on how to solve this problem?

Best regards,

Jeroen Janssen