.ycm_extra_conf.py

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import os
import ycm_core

# These are the compilation flags that will be used in case there's no
# compilation database set (by default, one is not set).
# CHANGE THIS LIST OF FLAGS. YES, THIS IS THE DROID YOU HAVE BEEN LOOKING FOR.

flags = [
    '-Wall',
    '-Wextra',
    '-Werror',
    '-Wno-long-long',
    '-Wno-variadic-macros',
    '-std=c++11',
    '-x', 'c++',
    '-Isrc',
    '-Ibuild/src',
    '-Isrc/third_party/catch/include',
    '-I/usr/local/include/libmongoc-1.0',
    '-I/usr/local/include/libbson-1.0',
    '-I/usr/include'
    '-I/usr/local/include',
    '-isystem/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1',
]

# Set this to the absolute path to the folder (NOT the file!) containing the
# compile_commands.json file to use that instead of 'flags'. See here for
# more details: http://clang.llvm.org/docs/JSONCompilationDatabase.html
#
# Most projects will NOT need to set this to anything; you can just change the
# 'flags' list of compilation flags. Notice that YCM itself uses that approach.
compilation_database_folder = ''

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_)

        try:
            final_flags.remove('-stdlib=libc++')
        except ValueError:
            pass
    else:
        relative_to = DirectoryOfThisScript()
        final_flags = MakeRelativePathsInFlagsAbsolute(flags, relative_to)

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