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 <[email protected]> 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 <[email protected]> > 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 > > >
