[Interest] Correcting deployment linkages in Linux shared libraries

[Rainer Wiesenfarth]

Am 04.12.2013 05:58, schrieb Thiago Macieira:
> On terça-feira, 3 de dezembro de 2013 19:51:44, Bob Hood wrote:
>> [...]
>> However, the plug-in shared libraries don't seem to be adhering to this
>> redirection mechanism.  If I deploy to a "clean" installation of my Linux
>> distribution, the shared libraries have changed their linkages to the Qt
>> version found in /usr/lib64 (which, in this case, is 4.6.2) instead of using
>> those in the folder with them.  I discovered using the ldd tool.
>>
>> Is there a post-build action I need to perform to "fix" these linkages, like
>> the "install_name_tool" utility under OS X?  If not, how do I get these
>> plug-ins to use the Qt deployed with them?
>
> Post-build? No.
>
> Add an -rpath $ORIGIN [...]

What we did in addition for our software is to add these options to the 
Qt configure:

   -buildkey namexyz -no-rpath -R $ORIGIN

This was used to prevent 'our' QtCore4.so (?) from loading 
system-installed plugins that in turn tried to use a different version 
of the Qt shared objects.

Thiago, please comment on this if it happens to be complete nonsense... :-)

Best Regards / Mit freundlichen Grüßen
Rainer Wiesenfarth

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