[Dune] dune-2.4, cmake and installed core modules

[Christian Engwer]

Hi Ansgar, I found the issue...

The problem was indeed a compatibility issue between different
compiler versions. I was not aware of the new ABI change. I used 4.9
with the afore mentioned issues. Switching to the default compiler
fixed the problem.

Ciao
Christian

On Tue, May 03, 2016 at 11:43:20PM +0200, Ansgar Burchardt wrote:
> Hi,
> 
> Christian Engwer <christian.engwer at uni-muenster.de> writes:
> > OK, I think I'm getting close and this seems to be some kind of more
> > general issue.
> >
> > The obj file requires the following symbols:
> > nm -uC CMakeFiles/eeg_dg_hex_1_forward.dir/eeg_conforming_forward.cc.o  | grep ParameterTree::sub
> >                  U Dune::ParameterTree::sub(std::string const&)
> >                  U Dune::ParameterTree::sub(std::string const&) const
> > while the lib provides:
> > nm -C --defined-only /usr/lib/x86_64-linux-gnu/libdunecommon.a | grep ParameterTree::sub
> > 00000000000013d0 T
> > Dune::ParameterTree::sub(std::__cxx11::basic_string<char,
> > std::char_traits<char>, std::allocator<char> > const&)
> > 00000000000005d0 T
> > Dune::ParameterTree::sub(std::__cxx11::basic_string<char,
> > std::char_traits<char>, std::allocator<char> > const&) const
> > 000000000000000b r
> > Dune::ParameterTree::sub(std::__cxx11::basic_string<char,
> > std::char_traits<char>, std::allocator<char> > const&) const::__func__
> >
> > What strikes me is the std::__cxx11::basic_string parameter, where I'm
> > pretty sure that in my case (--std=c++14) basic_string will not be in
> > a sub-namespace __cxx11.
> >
> > Might this be a problem of different C++ compiler versions?
> 
> Which compiler and version is `cxxcompiler`?
> 
> The C++ standard library changed its ABI in some places with C++11; a
> compatible ABI is also used with C++14.  All Debian packages use the new
> ABI which one can notice from the __cxx11 somewhere in the symbol names.
> 
> If I remember correctly, all compilers (or at least gcc) include their
> own version of the libstdc++ and one has to use a compiler that uses the
> new ABI.
> 
> At least Debian's default compiler in testing (currently gcc 5.3.1)
> should work. So you could try building with that and see if the linker
> problem disappears?
> 
> >> > PS: I was a bit surprised that the new Debian packages include the
> >> >     libs in the dev package
> 
> Yes, that is not common. However handling the DUNE libraries in the
> standard way causes some delays (every new DUNE version changes ABI ->
> packages need to be renamed -> renamed packages need extra review
> step). Having the library in an extra package only allows installing
> applications using the DUNE libraries without having to install the -dev
> packages. However there are no such applications in Debian and this will
> probably not change in the near future. So I chose to avoid some extra
> work and delays.
> 
> Ansgar
> 
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-- 
Prof. Dr. Christian Engwer 
Institut für Numerische und Angewandte Mathematik
Fachbereich Mathematik und Informatik der Universität Münster
Einsteinstrasse 62
48149 Münster

E-Mail  christian.engwer at uni-muenster.de
Telefon +49 251 83-35067
FAX     +49 251 83-32729