.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 = [
# 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=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',
'c',
'-Werror', 
'-Wall', 
'-Wimplicit-function-declaration',
'-Wno-uninitialized', '-Wno-pointer-sign',  
'-Wframe-larger-than=2047', '-Wno-address-of-packed-member',
'-Wno-constant-conversion', '-mcmodel=kernel',
'-mno-red-zone', '-mno-sse2', '-mno-sse', '-mno-3dnow',
'-mno-mmx', '-msoft-float', '-fno-omit-frame-pointer', '-ffreestanding',
'-fno-pie', '-mretpoline', '-nostdinc' '-I', '/usr/src/sys',
'-I', '/usr/src/sys/arch/amd64/compile/GENERIC.MP/obj',
'-I', '/usr/src/sys/arch',
'-D','DDB ', '-D','DIAGNOSTIC ', '-D','KTRACE ', '-D','ACCOUNTING ', 
'-D','KMEMSTATS ', '-D','PTRACE ', '-D','POOL_DEBUG ', '-D','CRYPTO ', 
'-D','SYSVMSG ', '-D','SYSVSEM ', '-D','SYSVSHM ', '-D','UVM_SWAP_ENCRYPT ', 
'-D','FFS ', '-D','FFS2 ', '-D','FFS_SOFTUPDATES ', '-D','UFS_DIRHASH ', 
'-D','QUOTA ', '-D','EXT2FS ', '-D','MFS ', '-D','NFSCLIENT ', '-D','NFSSERVER ', 
'-D','CD9660 ', '-D','UDF ', '-D','MSDOSFS ', '-D','FIFO ', '-D','FUSE ', 
'-D','SOCKET_SPLICE ', '-D','TCP_ECN ', '-D','TCP_SIGNATURE ', '-D','INET6 ', 
'-D','IPSEC ', '-D','PPP_BSDCOMP ', '-D','PPP_DEFLATE ', '-D','PIPEX ', 
'-D','MROUTING ', '-D','MPLS ', '-D','BOOT_CONFIG ', '-D','USER_PCICONF ', 
'-D','APERTURE ', '-D','MTRR ', '-D','NTFS ', '-D','HIBERNATE ', '-D','PCIVERBOSE ', 
'-D','USBVERBOSE ', '-D','WSDISPLAY_COMPAT_USL ', '-D','WSDISPLAY_COMPAT_RAWKBD ', 
'-D','WSDISPLAY_DEFAULTSCREENS="6" ', '-D','X86EMU ', '-D','ONEWIREVERBOSE ', 
'-D','MULTIPROCESSOR ', '-D','MAXUSERS=80 ', '-D','_KERNEL', '-MD', '-MP'
]


# 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
#
# You can get CMake to generate this file for you by adding:
#   set( CMAKE_EXPORT_COMPILE_COMMANDS 1 )
# to your CMakeLists.txt file.
#
# 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:
      relative_to = DirectoryOfThisScript()
      return {
        'flags': MakeRelativePathsInFlagsAbsolute( flags, relative_to ),
        'do_cache': True
      }

    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
  }