On Fri, Nov 27, 2009 at 8:52 PM, Satish Balay <[email protected]> wrote:

On Fri, 27 Nov 2009, Satish Balay wrote:

...

On Fri, 27 Nov 2009, Barry Smith wrote:

...

   How does the gnu/autoconf world handle this. If you have two gnu/autoconf installed packages how can you tell they are compatible? You should use the same type of mechanism they use.  (what?, they don't have such a mechanism? Well then that is a limitation of the --prefix model and you have to live with that).

The issue is not what the prefix model dictates. The issue is: do slepc/petsc4py support both modes of install similar to PETSc. If not why does PETSc need PETSC_ARCH for a prefix install? [if we are so pure with supporting gnu/autoconf model?].

I read the comment slightly out of context - please ignore.. [now I see you are refering to the "unique-identifier" as a sanity check issue]

Indeed. Right now I've already pushed fixes for the changes in petsc-dev. Currently I can suport a prefix-PETSc+prefix-SLEPc, or non-prefix-PETSc+non-prefix-SLEPc. The later is a non-issue, as PETSC_ARCH more or less disambiguate incompatible builds and moreover let runtime-selection of what variant to use (think of hacking Python import path, though I did something a safer). However, mixes schemes are harder to deal. You know how easy is for end users (and the many naive sysadmins) out there to make nasty mixups of incompatible stuff. I want to protect from that, because I do not want to waste my time with mails arriving at my inbox saying "hey Lisandro, I've installed petsc4py and slepc4py, but i get Segmentation fault, do you know what could be going on?" This tread got long enough. Let's stop here, please. All us have more important matters to spend our time. I think I'll end-up requiring users to prefix-installs for both PETSc and SLEPc, or non-prefix also for both, but never a mix. -- Lisandro Dalcín --------------- Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC) Instituto de Desarrollo Tecnológico para la Industria Química (INTEC) Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) PTLC - Güemes 3450, (3000) Santa Fe, Argentina Tel/Fax: +54-(0)342-451.1594