Comment 7 for bug 882560

On 27 October 2011 19:38, Johan Hake <email address hidden> wrote:
> On Thursday October 27 2011 10:25:22 Garth Wells wrote:
>> I don't think that it's a fix. We need to search for right library. It
>> may be in a non-standard location, and in my case it should link to

It was just meant as a pointer to where the problem lies, not a proper fix.

>>     libboost_math_tr1-mt.so
>>
>> and not
>>
>>     libboost_math_tr1.so
>>
>> Perhaps UFC should supply the build flags?

That could work for this case, but since UFC is not concerned about
how the functions are implemented it seems more natural that the form
compiler supplies the additional flags needed for the generated code.

> There are already logic in the building of extension modules to find the boost
> libraries, or more precise the boost header for shared_ptr. So it is not
> unatural to add logic for finding the correct boost math library.

But should it be? shared_ptr is not used in native UFC AFAIK, it is
used for the DOLFIN wrapper code generated by FFC which again suggests
that FFC supplies the additional flags.

So with this argument, FFC could use the DOLFIN configuration to get
the correct include dirs and libraries?

If FFC is used from the command line to generate a header file which
is included in a DOLFIN program, I would expect Garth's fix to work
for the C++ version.

Kristian

> What do you mean with UFC supply build flags?
>
> Johan
>
>> Garth
>
> --
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> https://bugs.launchpad.net/bugs/882560
>
> Title:
>  tr1::cyl_bessel_* functions are not found at linking stage of jit
>
> Status in DOLFIN:
>  Confirmed
>
> Bug description:
>  When a jit compiled module using bessel functions is imported into
>  python, it fails with an undefined symbol error. Probably because the
>  boost math tr1 library is not linked in.
>
>  ImportError:/home/martinal/.instant/cache/d003d0ea29ed9346265963000f1a90648953f6a6/_d003d0ea29ed9346265963000f1a90648953f6a6.so:
>  undefined symbol: boost_cyl_bessel_j;
>
>
>  Code to reproduce:
>
>  from dolfin import *
>  mesh = Interval(10, 0.1, 2.0)
>  V = FunctionSpace(mesh, "CG", 1)
>  x = interval.x
>  f = bessel_J(0, x)
>  g = project(f, V)
>  plot(g, mesh=mesh)
>  interactive()
>
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