Youcompleteme: Ycm server won't start

[rungokarol]

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Issue Details

[If filing a bug report, please include a list of steps that describe how to
reproduce the bug you are experiencing. Also include test code if relevant.]

I have installed Ycm via Vundle on vim7.4 in Ubuntu 14.04 on VirtualBox.
Compiled it with --clang-completer option
After opening any cpp/hpp file I got error message like that:
The ycmd server SHUT DOWN (restart with ':YcmRestartServer'). Unexpected error while loading the YCM core library. Run ':YcmToggleLogs stderr' to check the logs.

After command :YcmToggleLogs

Traceback (most recent call last):                                                                                                                     
 File "/home/rungo/.vim/bundle/YouCompleteMe/third_party/ycmd/ycmd/server_utils.py", line 95, in CompatibleWithCurrentCore
ycm_core = ImportCore()                                                                                                                            
File "/home/rungo/.vim/bundle/YouCompleteMe/third_party/ycmd/ycmd/server_utils.py", line 87, in ImportCore            
import ycm_core as ycm_core                                                                                                                        
ImportError: /usr/lib/i386-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.20' not found (required by /home/rungo/.vim/bundle/YouCompleteMe/third_party/ycmd/ycmd/../libclang.so.3.8)

i checked that:

$ sudo apt-get install libstdc++6
Reading package lists... Done
Building dependency tree       
Reading state information... Done
libstdc++6 is already the newest version.

[vheon]

That means that there is a mismatch between the version of libstdc++ required by the precompiled libclang that we download from the llvm site and the one you have installed. This is a bit strange since the one that we install is made for ubuntu 14.04 so there must be something wrong.

What is the output of strings /usr/lib/i386-linux-gnu/libstd++.so.6 | grep GLIBCXXX?

[rungokarol]

Thre is something strange...

$ sudo apt-get install libstdc++6
Reading package lists... Done
Building dependency tree       
Reading state information... Done
libstdc++6 is already the newest version.
The following packages were automatically installed and are no longer required:
  appmenu-qt appmenu-qt5 autopoint bamfdaemon friends friends-dispatcher
  gir1.2-accounts-1.0 gir1.2-ebook-1.2 gir1.2-ebookcontacts-1.2
  gir1.2-edataserver-1.2 gir1.2-messagingmenu-1.0 gir1.2-signon-1.0
  gsettings-ubuntu-schemas indicator-appmenu indicator-bluetooth
  indicator-datetime indicator-keyboard indicator-messages indicator-power
  indicator-printers indicator-session indicator-sound
  libaccount-plugin-generic-oauth libaccount-plugin-google libaudclient2
  libbamf3-2 libcolumbus1 libcolumbus1-common libdbusmenu-qt5 libfriends0
  libgee2 libglew1.10 libglewmx1.10 libgsettings-qt1 libid3tag0 libimlib2
  liblightdm-gobject-1-0 liblua5.1-0 libntdb1 libnux-4.0-0 libnux-4.0-common
  libpocketsphinx1 libsphinxbase1 libtimezonemap1 libunity-gtk2-parser0
  libunity-gtk3-parser0 libunity-misc4 liburl-dispatcher1 libxmmsclient6
  nux-tools python-ntdb python3-feedparser signon-keyring-extension
  signon-plugin-oauth2 sphinx-voxforge-hmm-en sphinx-voxforge-lm-en
  telepathy-indicator unity-greeter unity-lens-files unity-lens-friends
  unity-lens-music unity-lens-photos unity-lens-video unity-scope-audacious
  unity-scope-calculator unity-scope-chromiumbookmarks unity-scope-clementine
  unity-scope-colourlovers unity-scope-devhelp unity-scope-firefoxbookmarks
  unity-scope-gmusicbrowser unity-scope-gourmet unity-scope-guayadeque
  unity-scope-home unity-scope-manpages unity-scope-musicstores
  unity-scope-musique unity-scope-openclipart unity-scope-texdoc
  unity-scope-tomboy unity-scope-video-remote unity-scope-virtualbox
  unity-scope-yelp unity-scope-zotero unity-scopes-master-default
  unity-scopes-runner
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.




`$ strings /usr/lib/i386-linux-gnu/libstd++.so.6 | grep GLIBCXXX
strings: '/usr/lib/i386-linux-gnu/libstd++.so.6': No such file`

[micbou]

You are on Ubuntu 14.04 32-bit and since there is no Clang pre-built binaries available for this architecture, we use the binaries for Fedora 32-bit instead which seem to depend on a more recent version of libstdc++6. Try to update libstdc++6 by following these steps:

sudo add-apt-repository ppa:ubuntu-toolchain-r/test 
sudo apt-get update
sudo apt-get install libstdc++6

[rungokarol]

@micbou i have installed packages as you said in your comment and now I have another problem

Traceback (most recent call last):                                                                                      
File "/home/rungo/.vim/bundle/YouCompleteMe/third_party/ycmd/ycmd/server_utils.py", line 95, in CompatibleWithCurrentCore 
ycm_core = ImportCore()                                                                                             
File "/home/rungo/.vim/bundle/YouCompleteMe/third_party/ycmd/ycmd/server_utils.py", line 87, in ImportCore            
import ycm_core as ycm_core                                                                                         
ImportError: /home/rungo/.vim/bundle/YouCompleteMe/third_party/ycmd/ycmd/../libclang.so.3.8: symbol _ZTVNSt7__cxx1115basic_stringbufIcSt11char_traitsIcESaIcEEE, version GLIBCXX_3.4.21 not defined in file libstdc++.so.6 with link time reference

[micbou]

My bad, you need to upgrade your packages, not just libstdc++6:

sudo apt-get upgrade

[rungokarol]

still the same problem

[micbou]

Did you run again the install.py script?

[rungokarol]

Yes, i did it again, still issue with libclang

[vheon]

One thing that you could do for sure is to follow the full guide and compile libclang yourself... I know is not an optimal solution...

[micbou]

Or you could try to sudo apt-get dist-upgrade. If this still doesn't work then you can upgrade to Ubuntu 16.04 or install a 64-bit version.

[micbou]

I am closing this since it is a configuration issue and we don't support Ubuntu 32-bit (only 64-bit).

[fearphage]

I just saw this error on Ubuntu 17.04. The following command fixed it for me:

conda install libgcc

I got the idea from this thread.

Note: I did not perform the uninstall. The install upgraded the library and everything seems to be working now.

[yamsu]

Another option that worked for me, as I used gcc-5.2(non system gcc) to compile ycm, is to copy libstdc++.so.6 to the third_party/ycmd folder

The system libstdc++.so.6 file didn't have the necessary tag required by ycore.so as this lib wasn't used during compile time.

System Ubuntu 14.04 64bit with gcc 4.6

[timchenxiaoyu]

centos 7.4 also have this promblem

[bstaletic]

For RHEL/Centos we have a wiki entry on how to make it work.

[matrixzj]

@bstaletic will you provide a link for RHEL/CentOS wiki? Thanks a lot

[bstaletic]

Click on the wiki tab. Then click on the "Full installation on CentOS".

https://github.com/ycm-core/YouCompleteMe/wiki/Full-installation-on-CentOS