[vtk-developers] Add python version to all vtk libs that have python dependency

[David Gobbi]

On Tue, Oct 6, 2015 at 2:48 PM, Ben Boeckel <ben.boeckel at kitware.com> wrote:

> On Mon, Oct 05, 2015 at 22:46:00 -0600, David Gobbi wrote:
> > Currently it isn't feasible for copies of VTK that were built
> > against different versions of Python to be installed under
> > the same install prefix, because libs like vtkFiltersPython
> > would conflict between different Python versions.
> >
> > I propose renaming such libs to e.g. vtkFiltersPythonPy27
> > to indicate what version of the Python libs they link to.
> > Something similar was already done for the wrapper libs, e.g.
> > vtkCommonCorePython27D is CommonCore's wrapper lib.
> >
> > The renaming can be done automatically for any module lib
> > that depends on Python, as shown in this merge request:
> > https://gitlab.kitware.com/vtk/vtk/merge_requests/729
> >
> > Thoughts?
>
> So…what about modules which *link* to vtkFiltersPython or
> vtkPythonInterpreter? Which one do you get? It should be the Python that
> is *currently* found in the finding project, but who knows?
>

Only the filename is changed, not the target name.  CMake
uses target names to deal with dependencies.

The only real problem is when non-CMake projects try to find
these libraries.


This will need module logic awareness to duplicate any modules (and
> tests) which link to a versioned library to build for all versions. The
> file dropped in the Modules/ directory should also have this suffix so
> that vtkFiltersPython27 can coexist with vtkFiltersPython34.
>

My motivation is to make it possible for the distro folks (e.g.
debian, arch linux) to build vtk packages... and I agree that
module awareness of duplicate libraries would be a very nice
thing (if someone has the time).

I don't think building a single VTK with Python2 and Python3 from one
> build tree is feasible (nevermind multiple versions of either Python2 or
> Python3 in the same build).


What of the distro folks then?  I think we should at least try to meet
them halfway.

 - David
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