[vlc-devel] Regarding building of VLC using clang/LLVM on Linux/Ubuntu

[Steve Lhomme]

I ran into a similar issue. Basically when using protobuf from contribs, 
if it doesn't match exactly the protoc output (as in same A.B.x version) 
it will not accept the compiled .proto files. To fix that we may build 
the contribs with the same version reported by `protoc --version`, since 
there is no way that one version will satisfy everyone on all platforms 
(including bots).


Le 30/03/2018 à 06:39, Raghavan Santhanam a écrit :
> Those fat fingers.. eh..
>
> I found the resolution for this segfault/crashBN - I was able to build 
> VLC using *clang/LLVM*  on
> my *Ubuntu 17.10 x86_64*. The fix was to use the latest *protobuf 
> v3.5.10* instead of the default Ubuntu repo's
> protobuf v3.0.0, specifically, libprotobuf-lite.so was the FN place 
> where the crash/segfault was happening within its
> *google::protobuf::ShutdownProtobufLibrary()*. Will send out the 
> details of thus successful clang-build of VLC.
> I know that this protobuf issue is not specific to clang-usage, but 
> since that was a roadblock while building VLC
> even when using clang/LLVM instead of GCC, I am associating it with my 
> clang/VLC effort.
>
> - Raghavan Santhanam
>
> On Sun, Mar 25, 2018 at 6:52 AM, Rémi Denis-Courmont <remi at remlab.net 
> <mailto:remi at remlab.net>> wrote:
>
>     Le 25 mars 2018 20:42:39 GMT+08:00, Raghavan Santhanam
>     <raghavanil4m at gmail.com <mailto:raghavanil4m at gmail.com>> a écrit :
>     >What is BN, that you mentioned in your first reply? It looks like
>     >there's
>     >already an open VLC bug for this :
>     >https://trac.videolan.org/vlc/ticket/18329
>     <https://trac.videolan.org/vlc/ticket/18329>.
>     >Yes, I understood that the issues was with something else - same case
>     >with
>     >GCC. I am trying to resolve this issue in general.
>     >
>     >On Sun, Mar 25, 2018 at 5:20 AM, Rémi Denis-Courmont
>     <remi at remlab.net <mailto:remi at remlab.net>>
>     >wrote:
>     >
>     >> Le 25 mars 2018 20:16:54 GMT+08:00, Raghavan Santhanam <
>     >> raghavanil4m at gmail.com <mailto:raghavanil4m at gmail.com>> a écrit :
>     >> >Hello,
>     >> >
>     >> >OK, I am trying to build VLC using clang/LLVM on Ubuntu with
>     >necessary
>     >> >environment variables for library
>     >> >dependencies, etc. But, the make command is failing with a
>     segfault
>     >> >while
>     >> >it reaches "vlc-cache-gen" specific
>     >> >command and that doesn't change even after updating Intel
>     microcode,
>     >> >reboot, etc. So, wanted to know
>     >> >the status for Linux/Ubuntu. I saw some reports of clang/VLC
>     >> >compatibility.
>     >> >BTW, what is BN?!
>     >> >
>     >> >- Raghavan
>     >> >
>     >> >2018-03-25 4:35 GMT-07:00 Rémi Denis-Courmont <remi at remlab.net
>     <mailto:remi at remlab.net>>:
>     >> >
>     >> >> Hi,
>     >> >>
>     >> >> VLC is built using clang on several platforms BN already. I
>     can't
>     >> >comment
>     >> >> on your specific combination.
>     >> >> --
>     >> >> Envoyé de mon appareil Android avec Courriel K-9 Mail. Veuillez
>     >> >excuser ma
>     >> >> brièveté.
>     >> >>
>     >>
>     >> That sounds like a bug in an underlying library with no
>     relationship
>     >to
>     >> the compiler. Does it work any better with GCC?
>     >> --
>     >> Envoyé de mon appareil Android avec Courriel K-9 Mail. Veuillez
>     >excuser ma
>     >> brièveté.
>     >>
>
>     It was a trivial case of fat fingers.
>
>     I believe the linked bug already answers your question. Since this
>     is a problem with protobuf and triggered by Mir, there are no
>     clean fixes within VLC.
>     --
>     Envoyé de mon appareil Android avec Courriel K-9 Mail. Veuillez
>     excuser ma brièveté.
>
>
>
>
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