[Slackbuilds-users] About vlc SBo

[Luiz Carlos Ramos]

Chris,

good to know that it could help. Of course this only happened because of
something unusual in my machine, otherwise it would stay out of sight.


Many thanks,

Luiz


On Thu, Nov 15, 2018 at 02:13:22PM +1000, Christoph Willing wrote:
> On 6/11/18 9:07 pm, Luiz Carlos Ramos via SlackBuilds-users wrote:
> > Hello,
> > 
> > This email is to tell about a problem in building vlc and how it could
> > be worked around.
> > 
> > I was just updating a system here (x86_64 with multilib), running
> > SlackBuilds manually to rebuild some old packages and experienced a
> > problem with the binary vlc generated, which gave segfaults
> > systematically.
> > 
> > I tried to analyze the problem and found a piece of code inside
> > pulseaudio which calls shm_open() (which is supplied from librt.so).
> > Going further, I found that shm_open() tries to call __shm_directory()
> > and this function - which is inside libpthread.so - is not correct
> > linked for some reason. When the call is tried, the segfault
> > happens.
> > 
> > (yes, to find it I have to google a little; this article showed the
> > trick:
> > https://stackoverflow.com/questions/47905554/segmentation-fault-appears-when-i-use-shared-memory-only-from-statically-build-p)
> > 
> > I could find a way to work around it. The vlc binary, as it was built in
> > the machine, required libpthread.so but not librt.so (verified by
> > calling objdump -x vlc). I managed to add librt.so in the final link
> > (using SLKLDFLAGS="-lrt") and the resulting vlc added librt.so as a
> > "NEEDED" dependency. Installing the package, the problem was gone.
> > 
> > Of course this is not happening in the majority of the installations,
> > but as it happened here, it can happen anywhere.
> >
> Hi Luiz,
> 
> Thanks for diagnosing the problem and suggesting a fix. I've never seen
> that problem myself but you're right that it could happen anywhere so
> I've just pushed an update which sets SLKLDFLAGS="-lrt".
> 
> chris
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