On Thu, 16 Jan 2014 09:47:32 +0100
Johannes Ring <[email protected]> wrote:

> On Wed, Jan 15, 2014 at 2:20 PM, Jan Blechta
> <[email protected]> wrote:
> > On Tue, 14 Jan 2014 17:42:42 +0100
> > Johannes Ring <[email protected]> wrote:
> >
> >> On Tue, Jan 14, 2014 at 5:06 PM, Jan Blechta
> >> <[email protected]> wrote:
> >> > Is there a way choosing a SWIG installation if there are
> >> > multiple of them on the system? It seems that CMake-built-in
> >> > FindSWIG, say
> >> >
> >> >   $CMAKE_ROOT/share/cmake-2.8/Modules/FindSWIG.cmake
> >> >
> >> > picks one regardless of preset values SWIG_DIR and
> >> > SWIG_EXECUTABLE.
> >>
> >> You should be able to force this by running cmake with
> >> -DSWIG_EXECUTABLE:FILEPATH=/path/to/swig. Doesn't that work for
> >> you?
> >
> > Ok, this works. But generated code uses wrong swig version and
> > ffc/jitcompiler.py:check_swig_version(compiled_module) raises.
> >
> > I guess that possible reason is that one my SWIGs has both swig2.0
> > and swig executables while another has only swig. FindSWIG.cmake
> > prefers swig2.0 executable. So can -DSWIG_EXECUTABLE be passed to
> > cmake when configuring an extension module?
> 
> See attached patch for Instant. I haven't tested it but maybe
> something like that will fix this problem? Not sure it is a good fix
> though.
> 
> Setting CMAKE_PREFIX_PATH might also help CMake pick the correct swig
> binary.

Johannes,

as I said previously, arranging that preferred SWIG installation has
swig2.0 executable makes CMake-built-in FindSWIG.cmake working as
expected with either SWIG_DIR or SWIG_EXECUTABLE set. So it is not
written optimally as it every time prefers installations which have
swig2.0 executable.

I think that Johan suggest a correct solution - SWIG is stored within
DOLFINConfig. One could go further - DOLFIN could simply pick SWIG
found by UFC. Is it possible?

Jan

> 
> Johannes

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