[Bug lto/68902] New: --as-needed consider library as unneeded even when library have __init functions

[socketpair at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68902

            Bug ID: 68902
           Summary: --as-needed consider library as unneeded even when
                    library have __init functions
           Product: gcc
           Version: 5.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: socketpair at gmail dot com
  Target Milestone: ---

Original bug was reported here:

https://github.com/thom311/libnl/issues/93

libnl3 have such function:

static void __init ct_init(void)
{
    nl_cache_mngt_register(&nfnl_ct_ops);
}

so, when this library is loaded it register itself in some global variable for
later access.

When I link against that library, my program does not see that registration
since library just is not linked!

I consider gcc should not eliminate lbraries where __init functions exists.