'Vim YouCompleteMe c++17 : warning on decomposition declaration

I would like to set YouCompleteMe correctly so that I do not get the following warning on a c++ file:

...

auto [k,v] = mapIt; // some map iterator

...

decomposition declarations are a C++17 extension

I added 

   flags.append( '-std=c++17' )

in

~/.vim/bundle/YouCompleteMe/third_party/ycmd/.ycm_extra_conf.py

and added the following to

~/.vimrc

let g:ycm_global_ycm_extra_conf = '~/.vim/bundle/YouCompleteMe/third_party/ycmd/.ycm_extra_conf.py'
vimc++17youcompleteme


Solution 1:[1]

I decided to remove the previous installation and do everything from the command line (assuming previous Vundle installation as recommended in YouCompleteMe docs).

# typical installation directory for vundle and pathogen
cd ~/.vim/bundle

# clone the repository for YouCompleteMe
git clone https://github.com/Valloric/YouCompleteMe.git
cd YouCompleteMe

# and all submodules
git submodule update --init --recursive

# install
python3 install.py --clang-completer

Next I created a simple ycm_extra_conf.py (without the .dot) containing:

def FlagsForFile ( filename, **kwargs ):
    return {
        'flags': ['-x', '-Wall', '-Wextra', '-Werror', '-std=c++2a']
    }

I added the c++2a flag, but c++17 should also work.

Then point to this file in your ~/.vimrc file.

let g:ycm_global_ycm_extra_conf = '$HOME/.vim/bundle/YouCompleteMe/ycm_extra_conf.py'

Note: you may have to add to your ~/.vimrc

Plugin 'Valloric/YouCompleteMe'

in your vimrc file.

And run (from vim)

:PluginInstall

I didn't do these steps as I had installed YouCompleteMe previously.

This seems to have fixed the problem for me. Hope this can be useful for someone.

Solution 2:[2]

just change the flag '-std=c++11' to '-std=c++17' in the .ycm_extra_conf.py .

that works for me perfectly.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Frankie Y. Liu
Solution 2 kroos

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