[petsc-dev] meaning of PETSC_USE_EXTERN_CXX?

[Barry Smith]

On Mar 5, 2013, at 7:47 PM, Matthew Knepley <knepley at gmail.com> wrote:

> 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.

  Ok,

   Barry

> 
>    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