[petsc-users] configuring petsc without downloading packages

[Matthew Knepley]

On Thu, Oct 22, 2015 at 1:42 PM, David Liu <daveliu at mit.edu> wrote:

> Hi, I have a simple question that I could not find a comprehensive answer
> anywhere on the website or manual, though I found examples of what I'm
> trying to do. Say I want to build a version of PETSc with some external
> package, such as MUMPS or SuperLU_DIST. I can do this by using flags such
> as "--download-superlu_dist" when I am configuring. However, what if I
> already have SuperLU_DIST, say either by installing it by myself from the
> SuperLU_DIST source, or from a previous configuration of PETSc, i.e. with
> downloaded files sitting in ${PETSC_DIR}/${PETSC_ARCH}/externalpackages?
> How can I save the trouble of re-downloading a package that I already have?
> For MPI, I can specify using "--with-mpi-dir", or I can simply have mpirun
> and mpicc, etc in my path. But is there a standard way to do this for
> external packages that you usually download? I vaguely recall reading
> somewhere that you can simply do
>
> --download-superlu_dist=${PATH_TO_SUPERLU_DIST}
>
> but that notation obviously seems a little weird.
>

1) If you already have it in externalpackages/ it will not download it again

2) If you download the tarball yourself, then
--download-<package>=<path/to/tarball> will use it

3) If you installed the package yourself,
--with-<package>-dir=</path/to/package> will use that

   Matt

-- 
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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