On Thu, 18 Jan 2024, Aaron Scheinberg 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? This symbol should be in libpetsc.so. Are you including petsc.h - but not linking in -lpetsc - from your code? balay@pj01:~/petsc/arch-linux-c-debug/lib$ nm -Ao libpetsc.so |grep petsc_allreduce_ct_th libpetsc.so:0000000004279a50 B petsc_allreduce_ct_th > Can I configure it to avoid that? I consulted google, > the FAQ and skimmed other documentation but didn't see anything. Thanks! If you wish to avoid petsc logging of MPI messages (but include petsc.h in your code?) - you can use in your code: >>>> #define PETSC_HAVE_BROKEN_RECURSIVE_MACRO #include <petsc.h> <<<< Or build it with -DPETSC_HAVE_BROKEN_RECURSIVE_MACRO compiler option Satish