On 4. Mar, 2010, at 15:56 , Biddiscombe, John A. wrote:
> given a config like this
>
> TARGET_LINK_LIBRARIES(${KIT}CxxTests vtkIO vtkImaging vtksys)
>
> I have the trouble that vtksys pulls in a whole bunch of DynamicLoader stuff
> (kwsys) - which apart from being rather odd when building statically, forces
> the linker to need -ldl added to the link line.
>
> The trouble I've got is that no matter which EXE_LINKER_FLAG etc, or other
> option I change, TARGET_LINK_LIBRARIES adds stuff to the end, and on linux,
> link order is important, so I am constantly having to manually edit
> cmake/make files to get stuff to link (libdl, libGL, libmpich, lib etc etc).
> This problem is a big one in the whole paraview build system.
>
> Is there any simple fix out there? (NB. It's not just libdl, but many others
> like it).
>
> JB
>
>
> --
> John Biddiscombe, email:biddisco @ cscs.ch
> http://www.cscs.ch/
> CSCS, Swiss National Supercomputing Centre | Tel: +41 (91) 610.82.07
> Via Cantonale, 6928 Manno, Switzerland | Fax: +41 (91) 610.82.82
Yep, static linking is a PITA and I don't think it can be correctly done in a
fully automatic fashion since CMake has no way of determining the dependencies.
If you are using Linux, you can try to modify the CMAKE_CXX_LINK_EXECUTABLE,
CMAKE_CXX_CREATE_SHARED_LIBRARY and CMAKE_CXX_CREATE_SHARED_MODULE variables
(possibly also for other languages) such that the <LINK_LIBRARIES> part is
enclosed in --start-group and --end-group which causes the linker to iterate
the libraries until no more symbols can be resolved. Obviously this comes with
a significant increase in linking-time...
HTH
Michael
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