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

[Rémi Denis-Courmont]

Le 30 mars 2018 09:25:31 GMT+03:00, Steve Lhomme <robux4 at ycbcr.xyz> a écrit :
>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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How about not using that unstable and buggy library in the first place? Why was it imported to begin with?
-- 
Envoyé de mon appareil Android avec Courriel K-9 Mail. Veuillez excuser ma brièveté.