Re: [Jack-Devel] [Fwd: Re: [Guitarix-developer] jack session crash]

On Wed, 2 Nov 2011 16:51:02 -0400
Paul Davis <[hidden]> wrote:

> On Wed, Nov 2, 2011 at 4:49 PM, Paul Davis
> <[hidden]> wrote:
> > On Wed, Nov 2, 2011 at 4:28 PM, Andreas Degert <[hidden]>
> > wrote:
> >
> >> Hi Paul, I'm the original author of the mail that hermann
> >> forwarded. Which part of my mail do you not understand? I thought
> >> I explained the problem :-)
> >
> >> AFAICS jackweak.h defines JACK_OPTIONAL_WEAK_EXPORT and
> >> JACK_OPTIONAL_WEAK_DEPRECATED_EXPORT, whereas the mentioned
> >> functions from jack/session.h use JACK_WEAK_EXPORT, which is
> >> defined in jack/weakmacros.h, which is included by session.h.
> >
> > fair point, i forgot that this was a mandatorily weakly linked
> > symbol. this doesn't really make any difference to the point.
> >
> > what does this show:
> >
> >    nm YourExecutable | grep jack_
> >
>  just for reference, this is what I get:
> 
> paul@sextet[2930]>cc -o js js.c -l jack
> paul@sextet[2931]>./js
> jack_client_get_uuid = 0x400510, jack_get_uuid_for_client_name = (nil)
> paul@sextet[2932]>nm js | grep jack_
>                  w jack_client_get_uuid
>                  w jack_get_uuid_for_client_name

try this:

------------------------------------------------------------
$ nm -D a.out | grep jack
         w jack_client_get_uuid
$ objdump -R -d a.out
[...]
Disassembly of section .plt:

080483f0 <printf@plt-0x10>:
 80483f0:       ff 35 f8 9f 04 08       pushl  0x8049ff8
 80483f6:       ff 25 fc 9f 04 08       jmp    *0x8049ffc
 80483fc:       00 00                   add    %al,(%eax)
        ...

08048400 <printf@plt>:
 8048400:       ff 25 00 a0 04 08       jmp    *0x804a000
 8048406:       68 00 00 00 00          push   $0x0
 804840b:       e9 e0 ff ff ff          jmp    80483f0 <_init+0x3c>

08048410 <__gmon_start__@plt>:
 8048410:       ff 25 04 a0 04 08       jmp    *0x804a004
 8048416:       68 08 00 00 00          push   $0x8
 804841b:       e9 d0 ff ff ff          jmp    80483f0 <_init+0x3c>

08048420 <__libc_start_main@plt>:
 8048420:       ff 25 08 a0 04 08       jmp    *0x804a008
 8048426:       68 10 00 00 00          push   $0x10
 804842b:       e9 c0 ff ff ff          jmp    80483f0 <_init+0x3c>

08048430 <jack_client_get_uuid@plt>:
 8048430:       ff 25 0c a0 04 08       jmp    *0x804a00c
 8048436:       68 18 00 00 00          push   $0x18
 804843b:       e9 b0 ff ff ff          jmp    80483f0 <_init+0x3c>

Disassembly of section .text:
[...]
------------------------------------------------------------

ciao
Andreas

1320303700.16810_0.ltw:2,a <20111103080058.6be249e2 at pluto dot noname>