[petsc-dev] meaning of PETSC_USE_EXTERN_CXX?

[Matthew Knepley]

On Tue, Mar 5, 2013 at 8:38 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
> On Mar 5, 2013, at 7:19 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:
>
> >
> > On Tue, Mar 5, 2013 at 6:58 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:
> >  I have created a fork https://bitbucket.org/BarryFSmith/petsc-dev-simp this contains all my changes plus Jed's changes with PETSC_INTERN. It
> works on all configurations I tried.
> >
> >    I propose:
> >
> >        Jed check it out and fix any thing I broke ASAP.
> >
> > Unfortunately, gitifyhg is slow for these one-shot pulls, mainly because
> hg bookmarks and branches are not namespaced. Perhaps we can hack a
> namespacing using the (perpetually unstable) Python API to make these fast.
> >
> > I'm testing it now.
> >
> >        We rework this fork to the new model,  C compiler and C++
> compiler (with C bindings). (No -with-c-support flag or
> PETSC_USE_EXTERN_CXX flag)
> >
> > Can we also get rid of --with-c++-support?
>
>    Hmm, doesn't seem to do anything. Yes we should get rid of this.
>
> >
> >              We will need to coordinate our edits on this, I am
> available to work on it but will not do anything until Jed tells me what to
> do. So Jed tell me what to do and I'll do it.  Better sooner (like now :-)
> then later.
> >
> > I would start by deleting all occurrences of PETSC_USE_EXTERN_CXX
> (assume it is always defined, but use defined(__cplusplus) for some include
> guards).
> >
> > Then I would change all PETSC_EXTERN_C and PETSC_INTERN_C statements to
> PETSC_EXTERN and PETSC_INTERN.
>
>    Ok, keep me informed with what is happening and if you want me to do
> something, just tell me.
>
> >
> > I don't think we can delete include/*.hh until Sieve is gone.
>
>    Matt,
>
>      Can we get rid of Sieve/Mesh/C++ code in PETSc and tell the current
> users to stick with the latest Mecurial before it was deleted?
>

I would really rather not do that. I think I can get everything done in 2
weeks, and then I can remove everything,
but doing it before that would cut that off from all the development which
I think would be a big hassle. I am very
close and don't want to disrupt it right at the end.

   Matt


>    Barry
>
> >
>
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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