Re: Change global symbol to local in ELF?

[Rayson Ho <raysonlogin at gmail dot com>]

You can try using "objcopy --localize-symbol" to turn symbols from
global to static:

tridge:/tmp/mozilla> nm a.o
00000000 T func

tridge:/tmp/mozilla> objcopy a.o --localize-symbol=func

tridge:/tmp/mozilla> nm a.o
00000000 t func

Rayson



On Wed, Apr 22, 2009 at 3:39 PM, Lonnie Princehouse
<lonnie.princehouse@gmail.com> wrote:
> Hi all,
>
> There's probably an easy answer for this, but I'm not really sure what
> to search for.
>
> I have a partially linked object lib.o:
>
>  ld -r -static file1.o file2.o ... -lc -o lib.o
>
> It defines a global function symbol, foo, that conflicts with a
> different function of the same name in another object, main.o
>
>  gcc main.o lib.o -o program
>
>  lib.o: In function `foo':
>  example/file1.c:3: multiple definition of `foo'
>  example/main.c:4: first defined here
>
> Both lib.o and main.o should use their own respective versions of
> foo(), so I don't think telling ld to ignore multiply defined symbols
> will work, since my understanding is that this would cause the first
> definition to be used everywhere.
>
> foo in lib.o is not needed by any external objects.  Ideally it would
> be local, not global.  So I guess I'm looking for a way to change a
> symbol from global to local, either during the partial linking step or
> before the final linking.  I've looked through the ld manual, and it
> seems a linker script could do this using symbol versions, but only
> with dynamically linking?  These are statically linked out of
> necessity (the target system doesn't do dynamic linking)
>
> Any suggestions greatly appreciated.
>
> (assume for now I that I can't rename the symbols in the source code)
>