Hi , I am trying to use MPI profiling to make mpi_init from a F77 program call my MPI_Init (written in C), but I do not manage to achieve that. In this simple F77 program: program main include 'mpif.h' integer error call mpi_init(error) call mpi_finalize(error) end I try to make the mpi_init call: int MPI_Init (int *argc, char ***argv){ int ret; printf("My function!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"); ret = PMPI_Init(argc, argv); return ret; } My MPI_Init belongs to a library libtarget.a I created. I use -profile for compiling and I created the target.conf containing: PROFILE_PRELIB="-L/homes/fisaila/benches/try/staticlib_mpif77 -ltarget" in the right place. The library appears in the command line before the mpich library: mpif77 -show -g -profile=target init_finalize.f -o init_finalize gfortran -g init_finalize.f -o init_finalize -I/homes/fisaila/software/mpich/include -L/homes/fisaila/software/mpich/lib -L/homes/fisaila/benches/try/staticlib_mpif77 -ltarget -Wl,-rpath -Wl,/homes/fisaila/software/mpich/lib -lmpich -lopa -lmpl -lrt -lpthread However, the program never gets into my MPI_Init. Any suggestion about what I am missing? Thanks Florin