Youcompleteme: you need to compile YCM before using it. Read the docs! ...but I did.

[winchendonsprings]

Still receiving this error after update and recompile

~ vim
ycm_client_support.[so|pyd|dll] and ycm_core.[so|pyd|dll] not detected; you need to compile YCM before using it. Read the docs!
Press ENTER or type command to continue

:PlugUpdate
and
./install.py

~ uname -a
Linux g62x 3.16.0-60-generic #80~14.04.1-Ubuntu SMP Wed Jan 20 13:37:48 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
~ vim --version
VIM - Vi IMproved 7.4 (2013 Aug 10, compiled Jan  2 2014 19:39:32)
Included patches: 1-52

[puremourning]

Please post the exact commands you ran, and their output. Please include how you installed YCM.
Importantly, please include the output of install.py

[winchendonsprings]

:PlugInstall YouCompleteMe

1   Updated. Elapsed time: 2.528801 sec.                                                         |  1                                                                                             
  1 [=]                                                                                          |~                                                                                               
  2                                                                                              |~                                                                                               
  3 - Finishing ... Done!                                                                        |~                                                                                               
  4 - YouCompleteMe: Already installed    

in my .vimrc is Plug 'Valloric/YouCompleteMe'

~ cd .vim/bundle/YouCompleteMe 
~/.vim/bundle/YouCompleteMe(master|✚1…) ./install.py 
-- The C compiler identification is GNU 4.8.4
-- The CXX compiler identification is GNU 4.8.4
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
Your C++ compiler supports C++11, compiling in that mode.
-- Found PythonLibs: /usr/lib/x86_64-linux-gnu/libpython2.7.so (found suitable version "2.7.6", minimum required is "2.6") 
-- Found PythonInterp: /usr/bin/python2 (found suitable version "2.7.6", minimum required is "2.6") 
NOT using libclang, no semantic completion for C/C++/ObjC will be available
-- Found PythonInterp: /usr/bin/python2 (found version "2.7.6") 
-- Looking for include file pthread.h
-- Looking for include file pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE  
-- Configuring done
-- Generating done
-- Build files have been written to: /home/ry/.tmp/ycm_build.LjNo_H
Scanning dependencies of target BoostParts
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Linking CXX static library libBoostParts.a
[ 80%] Built target BoostParts
Scanning dependencies of target ycm_client_support
Scanning dependencies of target ycm_core
[ 81%] [ 83%] [ 83%] [ 83%] Building CXX object ycm/CMakeFiles/ycm_core.dir/IdentifierCompleter.cpp.o
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Building CXX object ycm/CMakeFiles/ycm_client_support.dir/PythonSupport.cpp.o
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Building CXX object ycm/CMakeFiles/ycm_core.dir/LetterNode.cpp.o
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Building CXX object ycm/CMakeFiles/ycm_client_support.dir/LetterNode.cpp.o
[ 94%] [ 95%] Building CXX object ycm/CMakeFiles/ycm_client_support.dir/Candidate.cpp.o
Building CXX object ycm/CMakeFiles/ycm_core.dir/Candidate.cpp.o
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Building CXX object ycm/CMakeFiles/ycm_core.dir/versioning.cpp.o
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[100%] Building CXX object ycm/CMakeFiles/ycm_core.dir/IdentifierDatabase.cpp.o
Building CXX object ycm/CMakeFiles/ycm_client_support.dir/IdentifierDatabase.cpp.o
Linking CXX shared library /home/ry/.vim/bundle/YouCompleteMe/third_party/ycmd/ycm_core.so
Linking CXX shared library /home/ry/.vim/bundle/YouCompleteMe/third_party/ycmd/ycm_client_support.so
[100%] Built target ycm_client_support
[100%] Built target ycm_core
Scanning dependencies of target ycm_support_libs
[100%] Built target ycm_support_libs

[vheon]

what is the output of ls?

[puremourning]

and ls ~/.vim/bundle/YouCompleteMe/third_party/ycmd

[winchendonsprings]

~/.vim/bundle/YouCompleteMe(master|✚1…) ls
appveyor.yml  autoload  CODE_OF_CONDUCT.md  CONTRIBUTING.md  COPYING.txt  doc  install.py  install.sh  plugin  print_todos.sh  python  README.md  run_tests.py  third_party  travis

~/.vim/bundle/YouCompleteMe/third_party/ycmd(f982f62|✚1…) ls
appveyor.yml  check_core_version.py  clang_includes   COPYING.txt   cpp       README.md     style_format.sh        TESTS.md     update_boost.sh        ycm_core.so
build.py      ci                     CONTRIBUTING.md  CORE_VERSION  examples  run_tests.py  test_requirements.txt  third_party  ycm_client_support.so  ycmd

[micbou]

What is the output of

:echo filereadable( '/home/ry/.vim/bundle/YouCompleteMe/third_party/ycmd/ycm_core.so' )

in Vim?

[winchendonsprings]

@micbou
:echo filereadable( '/home/ry/.vim/bundle/YouCompleteMe/third_party/ycmd/ycm_core.so' )
is
0

[micbou]

So, the file exists but you can't read it in Vim. Could you check the permissions of the ycm_core.so and ycm_client_support.so files?

[winchendonsprings]

This is all my fault....

I switched from Vundle to vim-plug a while back and the plugin install directory changed from .vim/bundle to .vim/plugged

I was ./install.py from the wrong directory. I did ./install.py from .vim/plugged/YouCompleteMe and it works now.

Sorry and Thanks

[tgzhou98]

Shame on me. I come across the same problem. Thanks !!!

[i-chaochen]

I did ./install.py --clang-completer

My building seems successful, but why I only have ycm_core.so without ycm_client_support.so?

[bstaletic]

Because there is no ycm_client_support.so.