How to compile in C++ with dolfinx?

[prusso630]

I have to refer to so far:

How to compile c++ dolfinx code?

I have installed dolfinx using ubuntu PPA add-apt-repository ppa:fenics-packages/fenics apt update apt install fenicsx and I did not have any issue for using it in python. But what should I do to compile a C++ demo of dolfinx (like this Poisson example? [image] When I do cmake . make I get this error AttributeError: 'BasixElement' object has no attribute '_variant' make[2]: *** [CMakeFiles/demo_poisson.dir/build.make:62: poisson.c] Error 1 make[1]: *** [CMakeFiles/Makefile2:75: CMakeFi…

to which I followed the installation instructions contained within with apt terminal command.

First thing I had to do was install OpenMPI from source so that compiler can find mpi.h.

So far the only version of basix I have available to me is v0.6.0 (v0.7.0 is currently branch not found)

So the compiler is now looking for ufcx.h which I am under the impression is coming from package called ffcx. So I have access only so far to a recent github version to install from source.

So then:

prusso@yoga:~/ffcx$ pip install .
Defaulting to user installation because normal site-packages is not writeable
Processing /home/prusso/ffcx
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Preparing metadata (pyproject.toml) ... done
Requirement already satisfied: cffi in /usr/lib/python3/dist-packages (from fenics-ffcx==0.7.0.dev0) (1.15.0)
Requirement already satisfied: numpy in /usr/lib/python3/dist-packages (from fenics-ffcx==0.7.0.dev0) (1.21.5)
Requirement already satisfied: setuptools in /usr/lib/python3/dist-packages (from fenics-ffcx==0.7.0.dev0) (59.6.0)
ERROR: Could not find a version that satisfies the requirement fenics-basix<0.8.0,>=0.7.0.dev0 (from fenics-ffcx) (from versions: 0.4.0, 0.4.2.post1, 0.5.0, 0.6.0)
ERROR: No matching distribution found for fenics-basix<0.8.0,>=0.7.0.dev0
prusso@yoga:~/ffcx$ 

OK… So then there must be a way to ffcx install a ufcx.h? Anyone can help out which way to do this?

(So maybe to better phrase this… I am aware of a way to spack install that brings in basix v0.7.0 to build dolfinx cpp source from and install. The difficulty I have so far seems to be if the spack install is showing all packages to the compiler g++ or if additional steps need to be taken other than activated spack env to make spack packages available across the whole system environment to g++. So far if I choose a spack install way (as oppsed to apt) I still seem to be going through a different set of issues that I am asking separately from this issue on a different post. So far here is just a question should this turn into spack situation so far that is the only way I know of to access basix v0.7.0 so we can then install ffcx some way…)

[dokken]

Please start with checking what branch of ffcx you are using. i.e. what is the output of git branch.

[prusso630]

The output of git branch is:

prusso@yoga:~/ffcx$ git branch
* main

So for now I used an OpenMPI from source installed:

./configure
make
sudo make install

as I may have the impression that there also is an hdf5 in MPI mode how those differ or are used it?

[dokken]

@prusso630

prusso@yoga:~/ffcx$ git branch
* main

You have installed Basix v0.6.0

@prusso630

piler can find mpi.h.

So far the only version of basix I have available to me is v0.6.0

And should therefore compile against a compatible branch; v0.6.0