[unhammer]

I've been happy with https://github.com/abingham/emacs-ycmd – you have to make a .ycm_extra_conf.py per project, but that's about it. I also see people recommending https://github.com/cquery-project/cquery

You might want to try asking https://emacs.stackexchange.com/questions/ask or https://www.reddit.com/r/emacs/ though