Re: [petsc-dev] circular dependencies SLEPc

[Smith, Barry F. via petsc-dev]

> On Jun 26, 2019, at 1:53 PM, Jed Brown <j...@jedbrown.org> wrote:
> 
> "Smith, Barry F." <bsm...@mcs.anl.gov> writes:
> 
>>  It is still a PC, it may as part of its computation solve an eigenvalue 
>> problem but its use is as a PC, hence does not belong in SLEPc.
> 
> Fine; it does not belong in src/ksp/pc/.

  Why not? From the code mangement point of view that is the perfect place for 
it. It just depends on an external package in the same way that PCHYPRE depends 
on an external library. Having it off in some other directory src/plugins would 
serve no purpose. Of course making sure it doesn't get compiled into -lpetsc 
may require a tweak to the make infrastructure. Make could, for example, skip 
plugin subdirectories for example.

  BTW: Matt's perverse use of SNES from DMPLEx could also be fixed to work this 
way instead of the disgusting PetscObject casting used to cancel the SNES 
object.


  Barry