[Bug gdb/27580] gcore: stream libthread_db information

["mliska at suse dot cz" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27580

--- Comment #3 from Martin Liska <mliska at suse dot cz> ---
The message will be displayed if you debug a core file from a machine that has
e.g. ancient version of glibc:

gdb/linux-thread-db.c:

/* Predicate which tests whether objfile OBJ refers to the library
   containing pthread related symbols.  Historically, this library has
   been named in such a way that looking for "libpthread" in the name
   was sufficient to identify it.  As of glibc-2.34, the C library
   (libc) contains the thread library symbols.  Therefore we check
   that the name matches a possible thread library, but we also check
   that it contains at least one of the symbols (pthread_create) that
   we'd expect to find in the thread library.  */

static bool
libpthread_objfile_p (objfile *obj)
{
  return (libpthread_name_p (objfile_name (obj))
          && lookup_minimal_symbol ("pthread_create",
                                    NULL,
                                    obj).minsym != NULL);
}

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