Shell code in single precision gives non-reproducible forces
For the complex/sw test adding reference values for the forces causes it to be non-reproducible between different build configurations. See https://gerrit.gromacs.org/#/c/1259/ for details. It should be checked whether that is a caused by some bug in the code or whether it is expected. If it is expected the test should be adapted. For now the test doesn't has reference values for single precision forces (and thus the forces aren't tested).