setup

how to setup Plug

 curl -fLo ~/.vim/autoload/plug.vim --create-dirs     https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim


Plug 'Valloric/YouCompleteMe.git', { 'for': 'cpp' }
Plug '~/.vim/bundle/YouCompleteMe', { 'for': 'cpp' } ; unmanaged


####################################
git clone https://github.com/ramlok0/vimplugins
git submodule update --init --recursive

cd fzf
./install
cd ..
cd YouCompleteMe
sudo apt-get install cmake
python3 install.py --clang-completer --system-libclang

sudo dpkg -i fd.....deb

ignore tags and changes in submodules
git config -f .gitmodules submodule.YankRing.vim.ignore untracked

####
 pip install scan-build --user
build compilation params file
  .local/bin/intercept-build ~/bin/buildBind.sh mainline 34
 .local/bin/intercept-build ~/bin/buildBind.sh mainline 34

 .local/bin/intercept-build ~/bin/buildBind.sh mainline 34 sip 1

put it in ~/GIT/ directory
- replace vagrant with home
- "-funwind-tables", g/"-funwind-tables"/d
- replace  all "-D", "sdsfdsd" with "-Dsdsfdsd"
- for v3r5 g/"--sysroot\//d - remove all sysroot path - it breaks path for system includes
######

let g:ycm_global_ycm_extra_conf = 'path to .ycm_extra_conf.py'

let g:ycm_global_ycm_extra_conf = 'path to .ycm_extra_conf.py'

#####
clighter 
sudo apt-getisntall libclang1... python-clang-... same version
add to vimrc let g:clighter8_libclang_path="/usr/lib/llvm-6.0/lib/libclang.so"


######
cquery

llvm-config --prefix --version
clang --version
should be the same


def FlagsForFile(filename, **kwargs):
  return { 'flags': ['-I/usr/include', '-std=gnu89', '-xc'] }


import os
import os.path
import fnmatch
import logging
import ycm_core
import re


BASE_FLAGS = [
        '-Wall',
        '-Wextra',
        '-Werror',
        '-Wno-long-long',
        '-Wno-variadic-macros',
        '-fexceptions',
        '-ferror-limit=10000',
        '-DNDEBUG',
        '-std=c++11',
        '-x','c++',
        '-I','/usr/lib/',
        '-I','/usr/include/',
        '-I','include',
        '-isystem', '/usr/lib/c++/v1'
]

SOURCE_EXTENSIONS = [
        '.cpp',
        '.cxx',
        '.cc',
        '.c',
        '.m',
        '.mm'
        ]

SOURCE_DIRECTORIES = [
        'src',
        'lib'
        ]

HEADER_EXTENSIONS = [
        '.h',
        '.hxx',
        '.hpp',
        '.hh'
        ]

HEADER_DIRECTORIES = [
        'include'
        ]


def IsHeaderFile(filename):
    extension = os.path.splitext(filename)[1]
    return extension in HEADER_EXTENSIONS

def GetCompilationInfoForFile(database, filename):
    if IsHeaderFile(filename):
        basename = os.path.splitext(filename)[0]
        for extension in SOURCE_EXTENSIONS:
            # Get info from the source files by replacing the extension.
            replacement_file = basename + extension
            if os.path.exists(replacement_file):
                compilation_info = database.GetCompilationInfoForFile(replacement_file)
                if compilation_info.compiler_flags_:
                    return compilation_info
            # If that wasn't successful, try replacing possible header directory with possible source directories.
            for header_dir in HEADER_DIRECTORIES:
                for source_dir in SOURCE_DIRECTORIES:
                    src_file = replacement_file.replace(header_dir, source_dir)
                    if os.path.exists(src_file):
                        compilation_info = database.GetCompilationInfoForFile(src_file)
                        if compilation_info.compiler_flags_:
                            return compilation_info
        return None
    return database.GetCompilationInfoForFile(filename)



def FindNearest(path, target, build_folder):
    candidate = os.path.join(path, target)
    if(os.path.isfile(candidate) or os.path.isdir(candidate)):
        logging.info("Found nearest " + target + " at " + candidate)
        return candidate;

    parent = os.path.dirname(os.path.abspath(path));
    if(parent == path):
        raise RuntimeError("Could not find " + target);

    if(build_folder):
        candidate = os.path.join(parent, build_folder, target)
        if(os.path.isfile(candidate) or os.path.isdir(candidate)):
            logging.info("Found nearest " + target + " in build folder at " + candidate)
            return candidate;

    return FindNearest(parent, target, build_folder)



def MakeRelativePathsInFlagsAbsolute(flags, working_directory):
    if not working_directory:
        return list(flags)
    new_flags = []
    make_next_absolute = False
    path_flags = [ '-isystem', '-I', '-iquote', '--sysroot=' ]
    for flag in flags:
        new_flag = flag

        if make_next_absolute:
            make_next_absolute = False
            if not flag.startswith('/'):
                new_flag = os.path.join(working_directory, flag)

        for path_flag in path_flags:
            if flag == path_flag:
                make_next_absolute = True
                break

            if flag.startswith(path_flag):
                path = flag[ len(path_flag): ]
                new_flag = path_flag + os.path.join(working_directory, path)
                break

        if new_flag:
            new_flags.append(new_flag)
    return new_flags


def FlagsForClangComplete(root):
    try:
        clang_complete_path = FindNearest(root, '.clang_complete')
        clang_complete_flags = open(clang_complete_path, 'r').read().splitlines()
        return clang_complete_flags
    except:
        return None

def FlagsForInclude(root):
    try:
        include_path = FindNearest(root, 'include')
        flags = []
        for dirroot, dirnames, filenames in os.walk(include_path):
            for dir_path in dirnames:
                real_path = os.path.join(dirroot, dir_path)
                flags = flags + ["-I" + real_path]
        return flags
    except:
        return None


def FlagsForCompilationDatabase(root, filename):
    try:
        # Last argument of next function is the name of the build folder for
        # out of source projects
        compilation_db_path = FindNearest(root, 'compile_commands.json', 'build')
        compilation_db_dir = os.path.dirname(compilation_db_path)
        logging.info("Set compilation database directory to " + compilation_db_dir)
        compilation_db =  ycm_core.CompilationDatabase(compilation_db_dir)
        if not compilation_db:
            logging.info("Compilation database file found but unable to load")
            return None
        compilation_info = GetCompilationInfoForFile(compilation_db, filename)
        if not compilation_info:
            logging.info("No compilation info for " + filename + " in compilation database")
            return None
        return MakeRelativePathsInFlagsAbsolute(
                compilation_info.compiler_flags_,
                compilation_info.compiler_working_dir_)
    except:
        return None

def FlagsForFile(filename):
    root = os.path.realpath(filename);
    compilation_db_flags = FlagsForCompilationDatabase(root, filename)
    if compilation_db_flags:
        final_flags = compilation_db_flags
    else:
        final_flags = BASE_FLAGS
        clang_flags = FlagsForClangComplete(root)
        if clang_flags:
            final_flags = final_flags + clang_flags
        include_flags = FlagsForInclude(root)
        if include_flags:
            final_flags = final_flags + include_flags
    return {
            'flags': final_flags,
            'do_cache': True
            }



############


down vote
accepted

Moved here from the question.

I found the problem:

flags = [
'-Wall',
'-Wextra',
'-Werror',
'-Wc++98-compat',
'-Wno-long-long',
'-Wno-variadic-macros',
'-fexceptions',
'-DNDEBUG',
'-std=c99',
# ...and the same thing goes for the magic -x option which specifies the
# language that the files to be compiled are written in. This is mostly
# relevant for c++ headers.
# For a C project, you would set this to 'c' instead of 'c++'.
'-x', #I don't know if I need remove -x
'c',
'-isystem',
'../llvm/include',
'-isystem',
'../llvm/tools/clang/include',
'-I./driver',
'-I./debug',
'-I./include',
]

I missed a comma and path should be ./xxx, also neeeeed '-I/usr/include', and '-I/usr/local/include'.



#####


import os

CURRENT_DIR = os.path.dirname(os.path.abspath(__file__))

include_dirs = [
    './arch/x86/include',
    './arch/x86/include/generated',
    './arch/x86/include/generated/uapi',
    './arch/x86/include/uapi',
    './include',
    './include/generated/uapi',
    './include/uapi',
]


include_files = [
    './include/linux/kconfig.h',
]

flags = [
    '-D__KERNEL__',
    '-std=gnu89',
    '-xc',
    '-nostdinc',
]

def FlagsForFile( filename, **kwargs ):
    """
    Given a source file, retrieves the flags necessary for compiling it.
    """
    for dir in include_dirs:
        flags.append('-I' + os.path.join(CURRENT_DIR, dir))

    for file in include_files:
        flags.append('-include' + os.path.join(CURRENT_DIR, file))

    return { 'flags': flags }