BuildSystem for PETSc+TAO

[Lisandro Dalcin]

When using petsc-2.3.3+tao-1.9, TAO does require that PETSc be built
with C++. I believe this is just because a PETSc built with C cannot
always provide enough info to TAO makefiles about the C++ compiler...
However, when PETSc is built with a external that requires C++/mpicxx,
then it seems some C++ stuff is configured even when core PETSc is
compiled with C/mpicc.

IMHO, this is a bit annoying, and could be done better and probably
with no too much work...

Could PETSc BuildSystem try to configure both C and C++ despite the
actual value of --with-clanguage ?? Does this make sense?


-- 
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