Arch Linux: error while loading shared libraries after updating `yaml-cpp` to 0.7.0

[javadr]

I updated my Linux distro (Manjaro) to the latest version, today. After that, thinkfan didn't work.

sudo systemctl status thinkfan
× thinkfan.service - simple and lightweight fan control program
Loaded: loaded (/usr/lib/systemd/system/thinkfan.service; enabled; vendor preset: disabled)
Drop-In: /etc/systemd/system/thinkfan.service.d
└─override.conf
Active: failed (Result: exit-code) since Sat 2021-11-20 14:30:55 +0330; 4s ago
Process: 39098 ExecStart=/usr/bin/thinkfan $THINKFAN_ARGS (code=exited, status=127)
CPU: 1ms

Nov 20 14:30:55 linuxlaptop systemd[1]: Starting simple and lightweight fan control program...
Nov 20 14:30:55 linuxlaptop thinkfan[39098]: /usr/bin/thinkfan: error while loading shared libraries: libyaml-cpp.so.0.>
Nov 20 14:30:55 linuxlaptop systemd[1]: thinkfan.service: Control process exited, code=exited, status=127/n/a
Nov 20 14:30:55 linuxlaptop systemd[1]: thinkfan.service: Failed with result 'exit-code'.
Nov 20 14:30:55 linuxlaptop systemd[1]: Failed to start simple and lightweight fan control program.

And trying thinkfan -n in a shell produced the following error:

thinkfan: error while loading shared libraries: libyaml-cpp.so.0.6: cannot open shared object file: No such file or directory

As far as I see, it depends on yaml-cpp-0.6.0, however, the latest version on my machine is yaml-cpp-0.7.0, now. So, to resolve this issue I made a symbolic link to the new one with the old name.

sudo ln -s /usr/lib/libyaml-cpp.so.0.7.0 /usr/lib/libyaml-cpp.so.0.6

It works for me now, but I don't know whether I am on the right path or not.

[koutheir]

sudo ln -s /usr/lib/libyaml-cpp.so.0.7.0 /usr/lib/libyaml-cpp.so.0.6

It works for me now, but I don't know whether I am on the right path or not.

This is very wrong, and it is against the reasons versions were invented. Applications using that library through the 0.6 symbolic link (including thinkfan in this instance) might fail in very mysterious ways.

The correct solution is to recompile thinkfan from sources. Either on your computer, or on a server farm that would provide the recompiled executable.

If thinkfan depends specifically on version 0.6, then thinkfan source code needs to be updated, or thinkfan needs to be statically linked against the version 0.6 of the library.

[koutheir]

As far as I could figure out, thinkfan should be compatible with version 0.7 of libyaml-cpp. This means that you should solve your issue by recompiling the thinkfan binary from source. If you installed thinkfan from ArchLinux AUR, then uninstalling and reinstalling thinkfan should solve the issue for you.

[javadr]

As far as I could figure out, thinkfan should be compatible with version 0.7 of libyaml-cpp. This means that you should solve your issue by recompiling the thinkfan binary from source. If you installed thinkfan from ArchLinux AUR, then uninstalling and reinstalling thinkfan should solve the issue for you.

I did uninstall the thinkfan and reinstalled it from AUR, but it didn't work for me and I got the same error!

[vmatare]

this is a duplicate of #162. Ping @bssb, maybe there is really something wrong with that AUR helper that's supposed to detect & fix these situations?

[vmatare]

So @javadr on the referenced bug I wrote that this is most likely a bug in your distribution package, but its maintainer @bssb assures me that all dependencies are represented correctly there. So that would mean it's a bug in your distribution's dependency manager.

[wiwie]

reinstall with cleanBuild did solve the problem for me.

[javadr]

Thanks @wiwie. Actually, reinstalling with cleanBuild solved the issue.