Re: [Bug 1054] OCL's OS::InitFunction not executed on Mint 15

We'll probably need a similar fix for the rttlua executables.

Ruben

On Fri, Feb 21, 2014 at 12:37 AM, S Roderick <[email protected]> wrote:
> http://bugs.orocos.org/show_bug.cgi?id=1054
>
> --- Comment #2 from S Roderick <[email protected]> 2014-02-21 00:37:48 CET ---
> Created attachment 867
>   --> http://bugs.orocos.org/attachment.cgi?id=867
> bin: Add link definitions to restore pre-4.6 default link behaviour
>
> This is partly a sequencing issue, and partly due to a shortcut taken in OCL.
>
> The deployer sequence is
> {{{
> main()
>    os_init()
>       // this runs all OS::InitFunction's registered with the
> RTT::StartStopManager
>    <E2><80><A6>
>    DeploymentComponent::kickStart()
>       // this actually processes the XML file contents and loads/processes any
> libraries
> }}}
> The only way that an OS::InitFunction will be run in os_init() is if the
> corresponding library is linked into the deployer; loading it via an XML import
> function is too late, as the StartStopManager has already been run.
>
> In Ubuntu 10.04 and OS X 10.8 the orocos-ocl-common library is a link
> dependency of the deployer executables; in Mint 15 it is not. Hence the
> loadOCL() function isn't available when os_init() is executed, and so the
> "cheat" used in OCL to load the types into the RTT type registry does not work
> (it's a cheat as it doesn't create a full plugin/typekit, which avoids this
> issue).
>
> In all O/S's the deployer executables are linked against the orocos-ocl-common
> library, it simply appears to be dropped from the resultant dependencies (as
> shown by ldd) in Mint 15. This is a known issue. Looks like gcc >=4.6 default
> behaviour has changed:
>
> http://stackoverflow.com/questions/11631161/force-to-link-against-unused-shared-library
> http://www.bnikolic.co.uk/blog/gnu-ld-as-needed.html
> https://wiki.gentoo.org/wiki/Project:Quality_Assurance/As-needed
>
> The attached patch fixes the issue, and works in both Mint 15 w/ gcc 4.7 and
> Ubuntu 10.04 w/ gcc 4.4
>
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-- 
Ruben Smits, CTO
+32 479 511 786
Intermodalics - Kapeldreef 60, 3001 Heverlee - BELGIUM
www.intermodalics.eu

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