Well, now I tried to update my code ... I was using:
git clone https://github.com/davydden/dealii
cd dealii
git checkout branch_petscscalar_complex

Now, because I would like to use a few recent additions from the 
development version, I do instead:
git clone https://github.com/dealii/dealii

1) First, I get way too many warnings like:
     
[-Wunused-variable],[-Wunused-parameter],[-Wunused-but-set-variable],etc ...

Then I would like to ask if there is a clean to disable warnings of this 
type? maybe adding some lines to the CMakeLists?

2) I realized that the type *PETScWrappers::Vector *has disappeared from 
the library! 
As mentioned above, I was comfortably reading a native PETSc vector *vec* 
from disk by doing *PETScWrappers::Vector (vec); *Now that it is gone, I 
don't really know what is the successor. 

By looking in step-17, *PETScWrappers::MPI::Vector *is passed to Vector for 
serial computations:
Vector<double> 
<https://www.dealii.org/8.5.0/doxygen/deal.II/classVector.html> 
localized_solution (solution);
I guess I could code a function to read native PETSc vectors into 
<https://www.dealii.org/8.5.0/doxygen/deal.II/classVector.html> 
<https://www.dealii.org/8.5.0/doxygen/deal.II/classVector.html>Vector
<PetscScalar> 
<https://www.dealii.org/8.5.0/doxygen/deal.II/classVector.html>*, * but I 
still think that if the latter is the successor of *PETScWrappers::Vector, 
*then 
it is intuitive to have an equivalent constructor like existed before in 
*PETScWrappers::Vector.* 
<https://www.dealii.org/8.5.0/doxygen/deal.II/classVector.html>


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