net-p2p/retroshare VoIP plugin: Undefined symbol

[Konstantin Belousov]

On Sat, Nov 03, 2012 at 01:59:18PM +0100, Peter Klett wrote:
> 
> Hi All,
> 
> I'm currently trying to get the VoIP plugin from RetroShare to work 
> under FreeBSD.
> After this patch I was able to build it:
> 
> --- plugins/VOIP/services/rsvoipitems.cc~       2012-02-26 
> 18:13:54.000000000 +0100
> +++ plugins/VOIP/services/rsvoipitems.cc        2012-10-29 
> 12:53:56.650925587 +0100
> @@ -182,7 +182,7 @@
>          ok &= setRawUInt32(data, tlvsize, &offset, flags);
>          ok &= setRawUInt32(data, tlvsize, &offset, data_size);
>           std::cerr << "data_size : " << data_size << std::endl;
> -        memcpy(data+offset,voip_data,data_size) ;
> +        memcpy(&((uint8_t*)data)[offset],voip_data,data_size) ;
>          offset += data_size ;
> 
>          if (offset != tlvsize)
> 
> But I can't get RetroShare to load it:
> 
> Cannot open plugin: /home/user/.retroshare/extensions/libVOIP.so: 
> Undefined symbol "_ZN9p3Service7receiveEP9RsRawItem"
> 
> Now the symbol is part of the RetroShare binary:
> 
> $ grep _ZN9p3Service7receiveEP9RsRawItem 
> work/trunk/retroshare-gui/src/RetroShare
> Binary file work/trunk/retroshare-gui/src/RetroShare matches
> 
> but somehow the symbols from the main binary do not get exported to the 
> plugin.
> The FreeBSD man page for dlopen(3) states in the NOTES section
> 
> ELF executables need to be linked using the -export-dynamic option to
> ld(1) for symbols defined in the executable to become visible to 
> dlsym().
> 
> 
> So I rebuilt RetroShare with the -export-dynamic option, and the symbol 
> is part of the symbol table:
> 
> $ objdump -t work/trunk/retroshare-gui/src/RetroShare | grep 
> _ZN9p3Service7receiveEP9RsRawItem
> 0000000000809580 g     F .text  00000000000000c7              
> _ZN9p3Service7receiveEP9RsRawItem
> 
> but still to no avail (same undefined symbol error).
> My knowledge of ELF binaries is pretty sparse, so if someone has more 
> clues, I would appreciate sharing :)

The objdump -t dumps wrong table. You want to examine the output of -T
AKA --dynamic-syms.
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