[petsc-dev] --download-dependencies flag?

[Aron Ahmadia]

In order to get a user up-and-running with a MUMPs-enabled PETSc, I
followed this frustrating chain:

configure --download-mumps=1

...

Error, no parmetis!

configure --download-mumps=1 --download-parmetis=1

Error, no scalapack!

configure --download-mumps=1 --download-parmetis=1 --download-scalapack=1

It would be convenient if the PETSc BuildSystem did what other package
installers like pip, yum, etc..., do, and grab dependencies that I need
based on what I have requested.

Additionally, it would make it a lot easier to build PETSc on complicated
systems if BuildSystem did a quick dependency/flag check instead off the
way it works now (sequential intermixing of really slow and fast configure
options).

A
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