Youcompleteme: YCM did not work

[suxilong]

Issue Prelude

Please complete these steps and check these boxes (by putting an x inside
the brackets) _before_ filing your issue:

• [x] I have read and understood YCM's CONTRIBUTING document.
• [x] I have read and understood YCM's CODE_OF_CONDUCT document.
• [x] I have read and understood YCM's README, especially the
  Frequently Asked Questions section.
• [x] I have searched YCM's issue tracker to find issues similar to the one I'm
  about to report and couldn't find an answer to my problem. (Example Google
  search.)
• [ ] If filing a bug report, I have included the output of vim --version.
• [ ] If filing a bug report, I have included the output of :YcmDebugInfo.
• [ ] If filing a bug report, I have attached the contents of the logfiles using
  the :YcmToggleLogs command.
• [ ] If filing a bug report, I have included which OS (including specific OS
  version) I am using.
• [ ] If filing a bug report, I have included a minimal test case that reproduces
  my issue, including what I expected to happen and what actually happened.
• [x] If filing a installation failure report, I have included the entire output
  of install.py (or cmake/make/ninja) including its invocation
• [x] I understand this is an open-source project staffed by volunteers and
  that any help I receive is a selfless, heartfelt _gift_ of their free time. I
  know I am not entitled to anything and will be polite and courteous.
• [x] I understand my issue may be closed if it becomes obvious I didn't
  actually perform all of these steps.

Thank you for adhering to this process! It ensures your issue is resolved
quickly and that neither your nor our time is needlessly wasted.

Issue Details

Provide a clear description of the problem, including the following key
questions:
YCM didn't work after build finish, although .vimrc is being set .

• What did you do?

Include steps to reproduce here.

Include description of a minimal test case, including any actual code required
to reproduce the issue.

1. sudo apt-get install build-essential cmake
2. sudo apt-get install python-dev python3-dev
3. sudo apt-get install clang
4. cd ~/.vim/bundle/YouCompleteMe
5. git clone https://github.com/Valloric/YouCompleteMe.git
6. git submodule update --init --recursive
7. ./install.py --clang-completer
8. cp third_party/ycmd/examples/.ycm_extra_conf.py ~
9. cd ..
10. cd..
11. cd..
12. vim .vimrc ====》 add let g:ycm_global_ycm_extra_conf = '~/.ycm_extra_conf.py' into .vimrc
13. vim test.c ====》 code complete function did not work！！！

• What did you expect to happen?

Include description of the expected behaviour.

• What actually happened?

Include description of the observed behaviour, including actual output,
screenshots, etc.

Diagnostic data

Output of vim --version

Place the output here, or a link to a gist.
VIM - Vi IMproved 7.4 (2013 Aug 10, compiled Nov 24 2016 16:44:48)
Included patches: 1-1689
Extra patches: 8.0.0056
Modified by [email protected]
Compiled by [email protected]
Huge version without GUI. Features included (+) or not (-):
+acl +farsi +mouse_netterm +tag_binary
+arabic +file_in_path +mouse_sgr +tag_old_static
+autocmd +find_in_path -mouse_sysmouse -tag_any_white
-balloon_eval +float +mouse_urxvt -tcl
-browse +folding +mouse_xterm +terminfo
++builtin_terms -footer +multi_byte +termresponse
+byte_offset +fork() +multi_lang +textobjects
+channel +gettext -mzscheme +timers
+cindent -hangul_input +netbeans_intg +title
-clientserver +iconv +packages -toolbar
-clipboard +insert_expand +path_extra +user_commands
+cmdline_compl +job -perl +vertsplit
+cmdline_hist +jumplist +persistent_undo +virtualedit
+cmdline_info +keymap +postscript +visual
+comments +langmap +printer +visualextra
+conceal +libcall +profile +viminfo
+cryptv +linebreak -python +vreplace
+cscope +lispindent +python3 +wildignore
+cursorbind +listcmds +quickfix +wildmenu
+cursorshape +localmap +reltime +windows
+dialog_con -lua +rightleft +writebackup
+diff +menu -ruby -X11
+digraphs +mksession +scrollbind -xfontset
-dnd +modify_fname +signs -xim
-ebcdic +mouse +smartindent -xsmp
+emacs_tags -mouseshape +startuptime -xterm_clipboard
+eval +mouse_dec +statusline -xterm_save
+ex_extra +mouse_gpm -sun_workshop -xpm
+extra_search -mouse_jsbterm +syntax
system vimrc file: "$VIM/vimrc"
user vimrc file: "$HOME/.vimrc"
2nd user vimrc file: "~/.vim/vimrc"
user exrc file: "$HOME/.exrc"
fall-back for $VIM: "/usr/share/vim"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -Wdate-time -g -O2 -fPIE -fstack-protector-strong -Wformat -Werror=format-security -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: gcc -Wl,-Bsymbolic-functions -fPIE -pie -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -o vim -lm -ltinfo -lnsl -lselinux -lacl -lattr -lgpm -ldl -L/usr/lib/python3.5/config-3.5m-x86_64-linux-gnu -lpython3.5m -lpthread -ldl -lutil -lm

Output of YcmDebugInfo

Place the output here, or a link to a gist.
E492: Not an editor command: YcmDebugInfo

Contents of YCM, ycmd and completion engine logfiles

Include link here to a gist containing the entire logfiles for ycm, ycmd
and any completer logfiles listed by :YcmToggleLogs.

OS version, distribution, etc.

Include system information here.
Linux ubuntu 4.10.0-28-generic #32~16.04.2-Ubuntu SMP Thu Jul 20 10:19:48 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

Output of build/install commands

Include link to a gist containing the invocation and entire output of
install.py if reporting an installation issue.
./install.py --clang-completer

clang --version

clang version 3.8.0-2ubuntu4 (tags/RELEASE_380/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/6.0.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0
Candidate multilib: .;@m64
Selected multilib: .;@m64

ycm build log

Searching Python 2.7 libraries...
Found Python library: /usr/lib/python2.7/config-x86_64-linux-gnu/libpython2.7.so
Found Python headers folder: /usr/include/python2.7
-- The C compiler identification is GNU 5.4.0
-- The CXX compiler identification is GNU 5.4.0
-- 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
-- Detecting C compile features
-- Detecting C compile features - 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
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found PythonLibs: /usr/lib/python2.7/config-x86_64-linux-gnu/libpython2.7.so (found suitable version "2.7.12", minimum required is "2.6")
Using libclang to provide semantic completion for C/C++/ObjC
Using external libclang: /usr/lib/x86_64-linux-gnu/libclang-3.8.so.1
-- Configuring done
-- Generating done
-- Build files have been written to: /tmp/ycm_build_uuTb3r
Scanning dependencies of target BoostParts
[ 1%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/errors.cpp.o
[ 2%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/long.cpp.o
[ 3%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/str.cpp.o
[ 5%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/object_protocol.cpp.o
[ 6%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/slice.cpp.o
[ 7%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/dict.cpp.o
[ 9%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/converter/from_python.cpp.o
[ 10%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/converter/builtin_converters.cpp.o
[ 11%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/converter/arg_to_python_base.cpp.o
[ 13%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/converter/registry.cpp.o
[ 14%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/converter/type_id.cpp.o
[ 15%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/list.cpp.o
[ 17%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/tuple.cpp.o
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[ 19%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/import.cpp.o
[ 21%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/exec.cpp.o
[ 22%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/wrapper.cpp.o
[ 23%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/module.cpp.o
[ 25%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/object/function_doc_signature.cpp.o
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[ 27%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/object/stl_iterator.cpp.o
[ 28%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/object/pickle_support.cpp.o
[ 30%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/object/inheritance.cpp.o
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[ 35%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/python/src/object/iterator.cpp.o
[ 36%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/w32_regex_traits.cpp.o
[ 38%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/wide_posix_api.cpp.o
[ 39%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/regex_raw_buffer.cpp.o
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[ 59%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/filesystem/src/codecvt_error_category.cpp.o
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[ 64%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/filesystem/src/windows_file_codecvt.cpp.o
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[ 69%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/system/src/error_code.cpp.o
[ 71%] Linking CXX static library libBoostParts.a
[ 71%] Built target BoostParts
Scanning dependencies of target ycm_core
[ 72%] Building CXX object ycm/CMakeFiles/ycm_core.dir/CandidateRepository.cpp.o
[ 73%] Building CXX object ycm/CMakeFiles/ycm_core.dir/LetterNodeListMap.cpp.o
[ 75%] Building CXX object ycm/CMakeFiles/ycm_core.dir/IdentifierCompleter.cpp.o
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[ 98%] Building CXX object ycm/CMakeFiles/ycm_core.dir/PythonSupport.cpp.o
[100%] Linking CXX shared library /home/m/.vim/bundle/YouCompleteMe/third_party/ycmd/ycm_core.so
[100%] Built target ycm_core

[micbou]

E492: Not an editor command: YcmDebugInfo

This means Vim didn't load the plugin. You can confirm that by looking at the output the :scriptnames command. YCM is loaded if it contains the line:

~/.vim/bundle/YouCompleteMe/autoload/youcompleteme.vim

Since you are not using a plugin manager, you should add the following line to your vimrc:

set rtp+=~/.vim/bundle/YouCompleteMe

[suxilong]

yes when all build finish，we should add ： set rtp+=~/.vim/bundle/YouCompleteMe into virmc