undefined reference to `vtable for dcsctp::TextPcapPacketObserver'

[svenstaro]

Hey, I'm the Arch Linux maintainer for Telegram and I'm trying to compile Telegram Desktop 3.3.0 for it. I'm using tg_owt d5c3d43 as a base. This is how I build tg_owt and this is how I build Telegram Desktop.

Everything seems fine until link time where I get:

/usr/bin/ld: /usr/lib/libtg_owt.so.0.0.0: undefined reference to `dcsctp::TaskQueueTimeoutFactory::TaskQueueTimeout::TaskQueueTimeout(dcsctp::TaskQueueTimeoutFactory&)'
/usr/bin/ld: /usr/lib/libtg_owt.so.0.0.0: undefined reference to `dcsctp::DcSctpSocketFactory::Create(std::basic_string_view<char, std::char_traits<char> >, dcsctp::DcSctpSocketCallbacks&, std::unique_ptr<dcsctp::PacketObserver, std::default_delete<dcsctp::PacketObserver> >, dcsctp::DcSctpOptions const&)'
/usr/bin/ld: /usr/lib/libtg_owt.so.0.0.0: undefined reference to `vtable for dcsctp::TextPcapPacketObserver'
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

I'm posting this here and not on the tdesktop repository as I believe there's something wrong with tg_owt.

Full tdesktop log
Full tg_owt log
Built via gcc 11.1.0.

Any hints? I believe I'm building everything correctly and tg_owt doesn't bark any missing dependencies or such.

[svenstaro]

I suppose I could do that but it doesn't seem like a proper fix.

[ilya-fedin]

Building as shared library is community supported and is not guaranteed to work. You can PR a fix or wait until someone else interested PR a fix.

[mikhailnov]

Have a look at https://abf.io/import/telegram-desktop/tree/rosa2021.1 , where tg_owt is built inside tdesktop and then tdesktop is linked to it statically as officially supported. A separate package with tg_owt does not make sense for now. But you can convert it from a shared library to a static one and it will become abuildtime only dependency of tdesktop, not runtime one.

[mikhailnov]

Of course it would be better to build tg_owt as a shred library but will anyone want to deal with it in that strange upstream...

[perestoronin]

simplest solution to build with shared linked

https://github.com/gentoo/gentoo/blob/master/media-libs/tg_owt/files/tg_owt-0_pre20211207-fix-dcsctp-references.patch

[svenstaro]

Perhaps that should be upstreamed @perestoronin