Incorrect results when compiled with CCE 7.4

[Niclas Jansson]

If Unicorn is compiled with the Cray Compiling Environment 7.4.0 and PETSc some solvers produce different or incorrect results compared to other systems.

Update: The problem is only visible if Slip boundary conditions are used.

[Niclas Jansson (njansson)]

This is probably due to some changes in either Cray C++ or the vendor provided PETSc. Reverting back to CCE 7.3.1 by issuing the following commands solves the problem.

module swap PrgEnv-pgi PrgEnv-cray (Assuming that PrgEnv-pgi is the default environment)
module swap cce cce/7.3.1.101
module swap xt-libsci xt-libsci/10.5.0
module add petsc/3.1.04

[Niclas Jansson (njansson)]

Support for CCE 7.4 is critical if we want to run Unicorn with Hybrid MPI/PGAS enabled DOLFIN.