This bug was fixed in the package ccls - 0.20190823.6-1~ubuntu1.20.04.1
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ccls (0.20190823.6-1~ubuntu1.20.04.1) focal; urgency=medium
* SRU the bugfix release to make it compatible with default llvm-10
fixing a FTBFS (LP: #1874508)
-- Gianfranco Costamagna Fri, 12 Jun 2020
it works for me
apt-get dist-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following package was automatically installed and is no longer required:
libllvm9
Use 'sudo apt autoremove' to remove it.
The foll
Hello Shengjing, or anyone else affected,
Accepted ccls into focal-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/ccls/0.20190823.6-1~ubuntu1.20.04.1
in a few hours, and then in the -proposed repository.
Please help us by testing this new package. S