[petsc-dev] Registration implicitly collective on COMM_WORLD

[Jed Brown]

On Tue, Feb 5, 2013 at 7:32 AM, Matthew Knepley <knepley at gmail.com> wrote:

>    4. XXIntializePackage() is called automatically for all default PETSc
> classes when using --with-single-library=1
>
> I am guessing that default call will use PETSC_COMM_WORLD.
>

One way to do this is to make a "constructor" function for each shared
library that registers its *InitializePackage function to be called from
PetscInitialize. (Constructors are called before main so they can't be
collective.) Then we wouldn't have a source-level reverse dependency and it
would get loaded even for single-library=0. I'm not aware of any platforms
that don't support some constructor mechanism, either via an attribute or
C++ (which should not require linking libstdc++).
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