Universal binaries...

[anyzelman]

...are currently broken. @KADichev can provide a recent example

[KADichev]

Here a basic example:

#include <cstring>
#include <lpf/core.h>
#include <lpf/mpi.h>

const int LPF_MPI_AUTO_INITIALIZE = 0;

void spmd( lpf_t lpf, lpf_pid_t pid, lpf_pid_t nprocs, lpf_args_t args )
{
    (void) args;  // ignore args parameter passed by lpf_exec
}

int main(int argc, char **argv)
{

  const int required = MPI_THREAD_SERIALIZED;

  int provided;
  MPI_Init_thread(&argc, &argv, required, &provided);
  if (provided != required) {
      fprintf(stderr, "Error: MPI threading level not supported!\n");
      return 1;
  }

  lpf_args_t args;
  memset(&args, 0, sizeof(lpf_args_t));
  args.input = argv;
  args.input_size = argc;
  lpf_init_t init;
  lpf_mpi_initialize_with_mpicomm(MPI_COMM_WORLD, &init);
  lpf_hook(init, &spmd, args);
  lpf_mpi_finalize(init);
  MPI_Finalize();
  return 0;
}

This does not compile without specifying engine:

lpfcxx  -o test2 test2.cpp 
/usr/bin/ld: /tmp/ccziLMzO.o: in function `main':
test2.cpp:(.text+0x56): undefined reference to `MPI_Init_thread'
/usr/bin/ld: test2.cpp:(.text+0xc0): undefined reference to `lpf_mpi_initialize_with_mpicomm'
/usr/bin/ld: test2.cpp:(.text+0xf8): undefined reference to `lpf_mpi_finalize'
/usr/bin/ld: test2.cpp:(.text+0xfd): undefined reference to `MPI_Finalize'
collect2: error: ld returned 1 exit status

This compiles:

lpfcxx -engine ibverbs  -o test2 test2.cpp 
/usr/bin/ld: /tmp/ccziLMzO.o: in function `main':
test2.cpp:(.text+0x56): undefined reference to `MPI_Init_thread'
/usr/bin/ld: test2.cpp:(.text+0xc0): undefined reference to `lpf_mpi_initialize_with_mpicomm'
/usr/bin/ld: test2.cpp:(.text+0xf8): undefined reference to `lpf_mpi_finalize'
/usr/bin/ld: test2.cpp:(.text+0xfd): undefined reference to `MPI_Finalize'
collect2: error: ld returned 1 exit status