[Bug dynamic-link/28503] New: dl_iterate_phdr namespace violation

["fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28503

            Bug ID: 28503
           Summary: dl_iterate_phdr namespace violation
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---

The program below aborts even though it does nothing wrong. The reason is that
the libgcc_s unwinder calls dl_iterate_phdr, which is not in the implementation
namespace, so the application should be able to define it in a different way.

#define _POSIX_SOURCE
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>

void
dl_iterate_phdr (void)
{
  abort ();
}

static void *
thread_func (void *ignored)
{
  pthread_exit (NULL);
  return NULL;
}

int
main (void)
{
  pthread_t thr;
  if (pthread_create (&thr, NULL, thread_func, NULL) != 0)
    {
      puts ("pthread_create failed");
      return 1;
    }
  if (pthread_join (thr, NULL) != 0)
    {
      puts ("pthread_join failed");
      return 1;
    }
  return 0;
}

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