[Gcl-devel] Re: ld from 2.14.90.0.8 puts no value into undefined symbols

[Alan Modra]

On Thu, Feb 26, 2004 at 07:10:12PM -0500, Camm Maguire wrote:
> Greetings! In 2.14.90.0.7 and earlier, I'd get a symbol table that
> looked like
> 
> objdump -x foo_good_raw |grep UND
> 0804a7dc       F *UND*        00000018              __gmpz_fdiv_q_2exp
> 0804a7ec       F *UND*        00000030              __gmpz_set_si
> 0804a7fc       F *UND*        0000003e              usleep@@GLIBC_2.0
> 0804a80c       F *UND*        00000026              cos@@GLIBC_2.0
> 0804a81c       F *UND*        0000003a              rename@@GLIBC_2.0
> 0804a82c       F *UND*        0000006d              ferror@@GLIBC_2.0
> 0804a83c       F *UND*        00000053              sigaction@@GLIBC_2.0
> ...
> 
> Now I get
> 
> objdump -x foo_bad_raw | grep UND
> 00000000       F *UND*        00000018              __gmpz_fdiv_q_2exp
> 00000000       F *UND*        00000030              __gmpz_set_si
> 00000000       F *UND*        0000003e              usleep@@GLIBC_2.0
> 00000000       F *UND*        00000026              cos@@GLIBC_2.0
> 00000000       F *UND*        0000003a              rename@@GLIBC_2.0
> 00000000       F *UND*        0000006d              ferror@@GLIBC_2.0
> 00000000       F *UND*        00000053              sigaction@@GLIBC_2.0

Yes, this is a result of a fairly recent optimization.  See
http://sources.redhat.com/ml/binutils/2004-01/msg00025.html and
following posts.

> I need to get the .plt address back somehow

Why?  Perhaps you could look at plt relocs.

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre