[CMake] Understanding constraint graph cycles

[Robert Maynard]

Hi,

Yes you are correct the issue is related to rpath. When CMake constructs
the rpath for the library linking it will have two paths (
/home/jenkins/workspace/FlightGear/dist/lib64,
/home/jenkins/workspace/SimGear/dist/lib64)
each that contain a copy of libosgText.so.130. CMake is warning that which
version of libosgText is undefined.

On Thu, Aug 24, 2017 at 10:08 AM, James Turner <james.turner at kdab.com>
wrote:

> Hi,
>
> Since upgrading to a recent CMake, the FLightGear build system is now
> reporting this:
>
> ==========
>         CMake Warning at utils/fgai/CMakeLists.txt:1 (add_executable):
>   Cannot generate a safe runtime search path for target fgai because there
> is
>   a cycle in the constraint graph:
>
>     dir 0 is [/home/jenkins/workspace/FlightGear/dist/lib64]
>       dir 1 must precede it due to runtime library [libosgText.so.130]
>     dir 1 is [/home/jenkins/workspace/SimGear/dist/lib64]
>       dir 0 must precede it due to runtime library [libosgText.so.130]
>
>   Some of these libraries may not be found correctly.
> ==============
>
>
> I can guess various dumb things I might have done to cause this, but can
> anyone give me some context? This is about rpath setting in the executables?
>
> SimGear is a helper library for FlightGear, build as static libs, and
> imported into FlightGear directly. SimGear and FlightGear both depend on
> OpenSceneGraph, and on our buiuld server (but not commonly in real life)
> Simgear and FlightGear are being configured with different install prefixes
> (that’s the /home/jenkins/workspace/<project>dist/lib64 part)
>
> Again rather than making ad-hoc changes to fix this, I’d like a bit more
> understanding about what is intended here, if anyone can suggest it.
>
> All this code is publicly visible on SourceForge BTW:
>
>         https://sourceforge.net/p/flightgear/_list/git?source=navbar
>
> Kind regards,
> James
> --
>
> Powered by www.kitware.com
>
> Please keep messages on-topic and check the CMake FAQ at:
> http://www.cmake.org/Wiki/CMake_FAQ
>
> Kitware offers various services to support the CMake community. For more
> information on each offering, please visit:
>
> CMake Support: http://cmake.org/cmake/help/support.html
> CMake Consulting: http://cmake.org/cmake/help/consulting.html
> CMake Training Courses: http://cmake.org/cmake/help/training.html
>
> Visit other Kitware open-source projects at http://www.kitware.com/
> opensource/opensource.html
>
> Follow this link to subscribe/unsubscribe:
> http://public.kitware.com/mailman/listinfo/cmake
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/cmake/attachments/20170904/e60de035/attachment.html>