[Bug ld/1443] /lib/libc.so.6: undefined reference to address@hidden'

[dave at hiauly1 dot hia dot nrc dot ca]

------- Additional Comments From dave at hiauly1 dot hia dot nrc dot ca  
2005-10-10 18:22 -------
Subject: Re:  /lib/libc.so.6: undefined reference to address@hidden'

> > ------- Additional Comments From hjl at lucon dot org  2005-10-09 15:15 
> > -------
> > If you can provide all input files, I will try to take a look.
> 
> I'll try to do this tomorrow.  It's Thanksgiving holiday here today.

Thinking a bit more about this, I decided providing the files would be
a bit tricky as I need to provide the glibc shared libraries.  So, I
looked a bit more into what's going on.

When elf_add_dt_needed_tag is called for ld.so.1, DO_IT is false.

Looking at this bit of code:

      /* If this dynamic lib was specified on the command line with
         --as-needed in effect, then we don't want to add a DT_NEEDED
         tag unless the lib is actually used.  Similary for libs brought
         in by another lib's DT_NEEDED.  When --no-add-needed is used
         on a dynamic lib, we don't want to add a DT_NEEDED entry for
         any dynamic library in DT_NEEDED tags in the dynamic lib at
         all.  */
         add_needed = (elf_dyn_lib_class (abfd)
                       & (DYN_AS_NEEDED | DYN_DT_NEEDED
                          | DYN_NO_NEEDED)) == 0;

I see:

(gdb) p *abfd
$17 = {id = 28, filename = 0xf5308 "/home/dave/opt/gnu/lib/ld.so.1",
  xvec = 0xb7c24, iostream = 0x0, iovec = 0xaa6ac, cacheable = 1,
  ...
(gdb) p abfd->tdata.elf_obj_data->dyn_lib_class
$18 = DYN_DT_NEEDED

So, add_needed is set to false.

Dave


-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=1443

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