.ycm_extra_conf.py

import os
import ycm_core

flags = [
'-Wall',
'-Wextra',
'-std=c++11',
'-g',
'-O0',
'-D_DEBUG',
'-x',
'c++',
'-I', './src/',
'-isystem', '/usr/include/c++/4.9',
'-isystem', '/usr/include',
]

compilation_database_folder = '/home/dex/projects/stacktracer/build'

if os.path.exists(compilation_database_folder):
  database = ycm_core.CompilationDatabase(compilation_database_folder)
else:
  database = None


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

def DirectoryOfThisScript():
  return os.path.dirname(os.path.abspath(__file__))

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 IsHeaderFile(filename):
  extension = os.path.splitext(filename)[1]
  return extension in [ '.h', '.hxx', '.hpp', '.hh' ]

def GetCompilationInfoForFile(filename):
  # The compilation_commands.json file generated by CMake does not have entries
  # for header files. So we do our best by asking the db for flags for a
  # corresponding source file, if any. If one exists, the flags for that file
  # should be good enough.
  if IsHeaderFile(filename):
    basename = os.path.splitext(filename)[0]
    for extension in SOURCE_EXTENSIONS:
      replacement_file = basename + extension
      if os.path.exists(replacement_file):
        compilation_info = database.GetCompilationInfoForFile(replacement_file)
        if compilation_info.compiler_flags_:
          return compilation_info
    return None
  return database.GetCompilationInfoForFile(filename)

def FlagsForFile(filename, **kwargs):
  if database:
    # Bear in mind that compilation_info.compiler_flags_ does NOT return a
    # python list, but a "list-like" StringVec object
    compilation_info = GetCompilationInfoForFile(filename)
    if not compilation_info:
      return None

    final_flags = MakeRelativePathsInFlagsAbsolute(compilation_info.compiler_flags_,
                                                   compilation_info.compiler_working_dir_)
  else:
    relative_to = DirectoryOfThisScript()
    final_flags = MakeRelativePathsInFlagsAbsolute(flags, relative_to)

  return {
    'flags': final_flags,
    'do_cache': True
  }