[petsc-users] undefined reference to `petsc_allreduce_ct_th'

[Aaron Scheinberg]

Thanks, it turns out there was another installation of PETSc, and it was
linking with the wrong one. It builds now.

On Thu, Jan 18, 2024 at 12:03 PM Barry Smith <bsmith at petsc.dev> wrote:

>
>    The PETSc petsclog.h  (included by petscsys.h) uses C macro magic to
> log calls to MPI routines. This is how the symbol is getting into your
> code. But normally
> if you use PetscInitialize() and link to the PETSc library the symbol
> would get resolved.
>
>    If that part of the code does not need PETSc at all you can not include
> petscsys.h and instead include mpi.h otherwise you need to track down why
> when your code gets linked against PETSc libraries that symbol is not
> resolved.
>
>   Barry
>
>
> On Jan 18, 2024, at 11:55 AM, Aaron Scheinberg <alscheinberg at gmail.com>
> wrote:
>
> Hello,
>
> I'm getting this error when linking:
>
> undefined reference to `petsc_allreduce_ct_th'
>
> The instances are regular MPI_Allreduces in my code that are not located
> in parts of the code related to PETSc, so I'm wondering what is happening
> to involve PETSc here? Can I configure it to avoid that? I consulted
> google, the FAQ and skimmed other documentation but didn't see anything.
> Thanks!
>
> Aaron
>
>
>
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