.ycm_extra_conf.py

import os
import ycm_core
from clang_helpers import PrepareClangFlags

# 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',
'-Wc++98-compat',
'-Wno-long-long',
'-Wno-variadic-macros',
'-fexceptions',
'-DNDEBUG',
'-DUSE_CLANG_COMPLETER',
# THIS IS IMPORTANT! Without a "-std=<something>" flag, clang won't know which
# language to use when compiling headers. So it will guess. Badly. So C++
# headers will be compiled as C headers. You don't want that so ALWAYS specify
# a "-std=<something>".
# For a C project, you would set this to something like 'c99' instead of
# 'c++11'.
'-std=c++11',
# ...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',
'c++',
'-isystem',
'../BoostParts',
'-isystem',
# This path will only work on OS X, but extra paths that don't exist are not
# harmful
'/System/Library/Frameworks/Python.framework/Headers',
'-isystem',
'../llvm/include',
'-isystem',
'../llvm/tools/clang/include',
'-I',
'.',
'-I',
'./ClangCompleter',
'-isystem',
'./tests/gmock/gtest',
'-isystem',
'./tests/gmock/gtest/include',
'-isystem',
'./tests/gmock',
'-isystem',
'./tests/gmock/include'
]

# 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.
import inspect, os
compilation_database_folder = os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe())))

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


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


def MakeRelativePathsInFlagsAbsolute( flags, working_directory ):
    if not working_directory:
        return 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 FlagsForFile( filename ):
    if database:
        # Bear in mind that compilation_info.compiler_flags_ does NOT return a
        # python list, but a "list-like" StringVec object
        compilation_info = database.GetCompilationInfoForFile( filename )
        final_flags = PrepareClangFlags(
            MakeRelativePathsInFlagsAbsolute(
                compilation_info.compiler_flags_,
                compilation_info.compiler_working_dir_),
            filename )

		# From user: OK I will not do this.
		#
        ## NOTE: This is just for YouCompleteMe; it's highly likely that your project
            ## does NOT need to remove the stdlib flag. DO NOT USE THIS IN YOUR
        ## ycm_extra_conf IF YOU'RE NOT 100% YOU NEED IT.
        #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
    }