Bug#947148: libltdl7: lt_dlopen() returns handle but lt_dlerror() returns non-NULL with OpenMPI4

[Andreas Beckmann]

Followup-For: Bug #947148
Control: reassign -1 libltdl7 2.4.6-11
Control: retitle -1 libltdl7: lt_dlopen() returns handle but lt_dlerror() 
returns non-NULL with OpenMPI4

Hi,

the bug does not manifest with plain dlopen() (see test_dlopen.c), so
this seems to be rather a ltdl problem:

If OpenMPI4 is loaded, attempting to lt_dlopen() some kernel generated
by pocl yields an inconsistent result:
* the returned lt_dlhandle is *not NULL*
* the error string returned by subsequent lt_dlerror() is *not NULL*


Andreas

// mpicc -o test_dlopen test_dlopen.c -ldl

#include <stdio.h>
#include <dlfcn.h>
#include <mpi.h>

int main(int argc, char **argv)
{
        MPI_Init(&argc, &argv);
        void * handle = dlopen ("./foo.so", RTLD_NOW | RTLD_LOCAL);
        const char * dl_error = dlerror ();
        printf("%p %s\n", handle, dl_error ? dl_error : "(null)");
}