[vtkusers] OSX 10.6 TCL issue "libvtkRendering.5.4.dylib: GC capability mismatch" ( solution too )

[David Gobbi]

Hi Brad,

The VTK 5.4/OS X 10.6 combination is known to have many problems, most
if not all of which have been fixed in cvs.  These include a boatload
of fixes specifically for Tk, as well as link fixes to the
CMakeLists.txt.  Can you try VTK cvs on your system and report whether
you are still seeing the problems that you describe below?  There will
be a VTK 5.6 release in (hopefully) the next few weeks that will
include all the OS X 10.6 fixes.

   David


On Wed, Mar 3, 2010 at 8:00 AM, Bradley Lowekamp <blowekamp at mail.nih.gov> wrote:
> Hello,
> I was getting the following error:
>>$ wish
> % package require vtk
> dlopen(~/local/lib/vtk-5.4/libvtkRenderingTCL.dylib, 10): Library not
> loaded: libvtkRendering.5.4.dylib
>   Referenced from: ~/local/lib/vtk-5.4/libvtkRenderingTCL.dylib
>   Reason: no suitable image found.  Did find:
> libvtkRendering.5.4.dylib: GC capability mismatch
> attempt to provide package vtkRenderingTCL 5.4 failed: no version of package
> vtkRenderingTCL provided
> attempt to provide package vtkrendering 5.4 failed: no version of package
> vtkrendering provided
> attempt to provide package vtk 5.4 failed: no version of package vtk
> provided
> The solution was to define the following CMake variable:
> -D VTK_REQUIRED_OBJECTCXX_FLAGS:STRING=-fobjc-gc
> I tried many different combinations of deployment targets, architecture, and
> cocoa vs carbon. In the end I have gotten it working for "i386;x86_64", the
> default 10.6 deployment target, cocoa, and tcl enabled.
> I am not a OBJC expert but it appears that with the Apple Snow Leopard
> (10.6) this flag may be needed for objc libraries for Garbage Collection
> compatibility. ( I wish google was smart enough to do a better job with two
> character searches "GC" ) I discovered the compatibility issue with the
> Tcl/Tk library, the question remains what other libraries will this also be
> a problem with?
>
> =Solution? =
> The -fobjc-gc should be added to the default OBJC arguments for the
> appropriate OS versions..
> From: http://developer.apple.com/mac/library/releasenotes/DeveloperTools/RN-Xcode/
> The Objective-C Garbage Collection setting enables compiling and linking
> Objective-C code for automatic garbage collection. It has three states:
> Unsupported disables garbage collection; Required (-fobjc-gc-only) will
> create an executable that runs only on Mac OS X 10.5 and later and will
> always run garbage collected; and Supported (-fobjc-gc) will create an
> executable that can run either garbage collected or not, depending on how
> the user chooses to launch it or, in the case of libraries and frameworks,
> whether the invoking application is using garbage collection.
> I am running cmake 2.6. But cmake appears not to even support the flags
> correctly:
> http://public.kitware.com/Bug/view.php?id=4756
> So likely the easies solution would be just to handle this inside VTK
> CMakeLists.txt
> Thanks,
> Brad
>
> ========================================================
>
> Bradley Lowekamp
>
> Lockheed Martin Contractor for
>
> Office of High Performance Computing and Communications
>
> National Library of Medicine
>
> blowekamp at mail.nih.gov
>
>
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