[CMake] using IMPORTED targets in multiple projects within one CMake tree

[Alexandre.Feblot at thomsonreuters.com]

I saw this too.
IMHO, it's a bug. If it's a feature, I don't see the point.

I ended defining all my imported targets in the top directory, to be
able to use them wherever I need them.

Alexandre

-----Original Message-----
From: cmake-bounces at cmake.org [mailto:cmake-bounces at cmake.org] On Behalf
Of Pentasopor
Sent: Tuesday, 05 May 2009 18:06
To: cmake at cmake.org
Subject: [CMake] using IMPORTED targets in multiple projects within one
CMake tree

Hi all,

here is what I'm trying to do:

I have a CMake build tree with several projects and targets with some
depending on others (impressive eh? ;)).  Furthermore I have a library
that I need to build outside of CMake and therefor I just added it
using

> add_library(xxx SHARED IMPORTED)

(But anyway - this is MY library, so I need to install it and
everything.)

I also set some target properties (like IMPORTED_LOCATION) for it.
All this happens in CMakeLists file 'A'.  So my build tree looks like
this:

(I will call the CMakeLists.txt files A, B, ... for distinction)

M
|--- A
|--- B
|  |--- BA
|  |--- BB
|--- C

where M is something like:
====
PROJECT(TheWholeThingy)
#.. some defines a.s.o.
ADD_SUBDIRECTORY(A)
ADD_SUBDIRECTORY(B)
ADD_SUBDIRECTORY(C)
====

Now if I try to use target 'xxx' in B, it will not get resolved.  But
if I add a 'real' target (without IMPORTED) to 'A', I can use it (e.g.
in TARGET_LINK_LIBRARIES) without problems in B.

I just want to have a single point in my CMake-lists where I define
this externally built library and use it at several positions within
the rest of my CMake tree.

(Only at one point, because names and positions change for different
build types and I do not want to copy&paste the IF/THEN code needed
here to all locations where I want to link against 'xxx'.)

What am I doing wrong here?  Is this supposed to work, or did I just
use the wrong mechanism?

Any help is reaaallllyy appreciated! :)
bye

   Pentasopor

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