[petsc-dev] BuildSystem: PCC=mpicc, CXX and FC

[Barry Smith]

On Sep 14, 2010, at 8:54 PM, Matthew Knepley wrote:

> Do we really want the full path to all compilers? We discussed this before and did not
> do it. Satish, do you remember why?

  With the full path I like the fact that the compiler choices are set at at ./configure time and won't mysteriously change (and result in failure) later if someone changes their path or installs a new MPI into the path.

  I do not know why you opted not to always have the full path.
> 
>    Matt
> 
> On Tue, Sep 14, 2010 at 8:51 PM, Lisandro Dalcin <dalcinl at gmail.com> wrote:
> On 14 September 2010 22:26, Barry Smith <bsmith at mcs.anl.gov> wrote:
> >
> > On Sep 14, 2010, at 8:24 PM, Lisandro Dalcin wrote:
> >
> >> On 14 September 2010 21:55, Barry Smith <bsmith at mcs.anl.gov> wrote:
> >>>
> >>> On Sep 14, 2010, at 6:24 PM, Lisandro Dalcin wrote:
> >>>
> >>>> 1) If mpicc is in $PATH, then petscvariables will get PCC=mpicc.
> >>>> Perhaps it should get the full path instead?
> >>>>
> >>>> 2) I think CXX and FC variables should be renames to PCXX and PFC. The
> >>>> former names can easily conflict with CXX and FC defined in user
> >>>> makefiles for use with non-MPI sources.
> >>>
> >>>   Then we should also get rid of CC
> >>>
> >>>    Essentially you are saying we should remove all "traditional" use of these variables from our makefiles? I agree doing that might be a good idea. But doesn't it contradict your attempt to try hard to conform to standard usage for things?
> >>>
> >>
> >> Sorry, I need a clarification: Could you tell me why PETSc makefiles
> >> uses PCC instead of the "traditional"  CC? Is it just because PCC
> >> could be CC or CXX depending on --with-c-language?
> >
> >   Yes that is one reason and may be the only reason.
> >
> 
> In such case, forget my comments, except for the part of setting
> PCC=/path/to/mpicc (and perhaps the same for CC, CXX, FC if they point
> to MPI compiler wrappers). What do you think about this? Please note
> I'm not objecting the current status, just asking about the full path
> alternative.
> 
> 
> --
> Lisandro Dalcin
> ---------------
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> 
> 
> 
> -- 
> 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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