How to correctly install YouCompleteMe on mac? - vim

Question

I have the following line in ~/.vimrc
Plugin 'valloric/youcompleteme'
Running PluginInstall successfully installed the plugin.
Then I ran python3 install.py --clang-completer under /Users/$UserName/.vim/bundle/youcompleteme.
Running vim gave me:
YouCompleteMe unavailable: requires Vim compiled with Python (3.5.1+) support.
The python3 version is 3.6.8.
vim --version shows that it has python3 support:
VIM - Vi IMproved 8.1 (2018 May 18, compiled Dec 13 2019 14:45:40)
Included patches: 1-503, 505-680, 682-1312
Compiled by root#apple.com
Normal version without GUI. Features included (+) or not (-):
+acl +extra_search -mouse_netterm -tag_old_static
-arabic -farsi +mouse_sgr -tag_any_white
+autocmd +file_in_path -mouse_sysmouse -tcl
+autochdir +find_in_path -mouse_urxvt -termguicolors
-autoservername +float +mouse_xterm +terminal
-balloon_eval +folding +multi_byte +terminfo
-balloon_eval_term -footer +multi_lang +termresponse
-browse +fork() -mzscheme +textobjects
+builtin_terms -gettext +netbeans_intg +textprop
+byte_offset -hangul_input +num64 +timers
+channel +iconv +packages +title
+cindent +insert_expand +path_extra -toolbar
-clientserver +job -perl +user_commands
-clipboard +jumplist +persistent_undo -vartabs
+cmdline_compl -keymap +postscript +vertsplit
+cmdline_hist +lambda +printer +virtualedit
+cmdline_info -langmap -profile +visual
+comments +libcall +python/dyn +visualextra
-conceal +linebreak -python3 +viminfo
+cryptv +lispindent +quickfix +vreplace
+cscope +listcmds +reltime +wildignore
+cursorbind +localmap -rightleft +wildmenu
+cursorshape -lua +ruby/dyn +windows
+dialog_con +menu +scrollbind +writebackup
+diff +mksession +signs -X11
+digraphs +modify_fname +smartindent -xfontset
-dnd +mouse +startuptime -xim
-ebcdic -mouseshape +statusline -xpm
-emacs_tags -mouse_dec -sun_workshop -xsmp
+eval -mouse_gpm +syntax -xterm_clipboard
+ex_extra -mouse_jsbterm +tag_binary -xterm_save
system vimrc file: "$VIM/vimrc"
user vimrc file: "$HOME/.vimrc"
2nd user vimrc file: "~/.vim/vimrc"
user exrc file: "$HOME/.exrc"
defaults file: "$VIMRUNTIME/defaults.vim"
fall-back for $VIM: "/usr/share/vim"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -DMACOS_X_UNIX -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: gcc -L/usr/local/lib -o vim -lm -lncurses -liconv -framework Cocoa

Answer 1

I use YouCompleteMe for C and built vim 8.2 from source on my mac with OSX 10.15. If you want to use it for c-family languages it's pretty finicky. You might spend a lot of time reading posts like these, ones where someone was having a different issue 3 months ago and there's no answer.
To build vim with python3 support you can do one of two things,
git clone https://github.com/vim/vim.git
cd vim
git pull
cd src
make distclean
./configure --with-features=huge
make
sudo make install
This will give you more than just python3. There aren't any drawbacks to having the extra features as far as I know.
my vim is installed in $HOME, I think the install script symlinked the binary to /usr/local/bin/vim.
or you can use homebrew and macvim which is what I would recommend,
brew install macvim
sources:
https://www.vim.org/git.php
https://vim.fandom.com/wiki/Building_Vim

Answer 2

YouCompleteMe need that VIM, that VIM must support Python3.
(That means that you need to use Python3 to config installling VIM).
As your VIM 's "vim --version" shows, your installed VIM Do Not Support
Python3(Beacuse the symbol before python3 is that '-', that '-' minus
means Your installed VIM do not support python3).
Even your Mac defualt python3 is over 3.5.1,
your installed VIM support python#2(from "+python/dyn" sa your "vim --version" shows).
Please use Homebrew reinstall VIM with supporting python3,
DO NOT USE your Mac default installed VIM.
Could refer:
0.Installing Vim with Python3 support on MacOS.
1.Debian Manually install VIM which suppoet Python3.
2.How do I install vim on OSX with Python 3 support?