Workaround for header files and compilation database

.ycm_extra_conf.py

import os
import re
import ycm_core
from clang_helpers import PrepareClangFlags

DATABASE_FOLDER = '/Users/zeh/code/zed/build'
DATABASE = ycm_core.CompilationDatabase(DATABASE_FOLDER)
EXTRA_FLAGS = [
        '-isystem',
        '/usr/lib/c++/v1',
        '-isystem',
        'usr/include/c++/4.2.1',
        '-isystem',
        '/usr/include/c++/4.2.1/ext',
]

def FlagsForFile(filename):
    isHeader = filename.endswith('.hpp')
    filename = re.sub(r"(_p)?\.hpp$", ".cpp", filename)
    info = DATABASE.GetCompilationInfoForFile(filename)
    flags = PrepareClangFlags(info.compiler_flags_, filename)
    if isHeader:
        flags.extend(EXTRA_FLAGS)
    return {
            'flags': flags,
            'do_cache': True
    }