configure

#!/usr/bin/env python
import optparse
import os
import pprint
import re
import shlex
import subprocess
import sys

CC = os.environ.get('CC', 'cc')

root_dir = os.path.dirname(__file__)
sys.path.insert(0, os.path.join(root_dir, 'tools', 'gyp', 'pylib'))
from gyp.common import GetFlavor

# parse our options
parser = optparse.OptionParser()

# Options should be in alphabetical order but keep --prefix at the top,
# that's arguably the one people will be looking for most.
parser.add_option('--prefix',
    action='store',
    dest='prefix',
    help='select the install prefix (defaults to /usr/local)')

parser.add_option('--debug',
    action='store_true',
    dest='debug',
    help='also build debug build')

parser.add_option('--dest-cpu',
    action='store',
    dest='dest_cpu',
    help='CPU architecture to build for. Valid values are: arm, ia32, x64')

parser.add_option('--dest-os',
    action='store',
    dest='dest_os',
    help='operating system to build for. Valid values are: '
         'win, mac, solaris, freebsd, openbsd, linux, android')

parser.add_option('--gdb',
    action='store_true',
    dest='gdb',
    help='add gdb support')

parser.add_option('--xcode',
    action='store_true',
    dest='use_xcode',
    help='generate build files for use with xcode')

(options, args) = parser.parse_args()


def b(value):
  """Returns the string 'true' if value is truthy, 'false' otherwise."""
  if value:
    return 'true'
  else:
    return 'false'


def pkg_config(pkg):
  cmd = os.popen('pkg-config --libs %s' % pkg, 'r')
  libs = cmd.readline().strip()
  ret = cmd.close()
  if (ret): return None

  cmd = os.popen('pkg-config --cflags %s' % pkg, 'r')
  cflags = cmd.readline().strip()
  ret = cmd.close()
  if (ret): return None

  return (libs, cflags)


def cc_macros():
  """Checks predefined macros using the CC command."""

  try:
    p = subprocess.Popen(shlex.split(CC) + ['-dM', '-E', '-'],
                         stdin=subprocess.PIPE,
                         stdout=subprocess.PIPE,
                         stderr=subprocess.PIPE)
  except OSError:
    print '''Node.js configure error: No acceptable C compiler found!

        Please make sure you have a C compiler installed on your system and/or
        consider adjusting the CC environment variable if you installed
        it in a non-standard prefix.
        '''
    sys.exit()

  p.stdin.write('\n')
  out = p.communicate()[0]

  out = str(out).split('\n')

  k = {}
  for line in out:
    lst = shlex.split(line)
    if len(lst) > 2:
      key = lst[1]
      val = lst[2]
      k[key] = val
  return k


def host_arch_cc():
  """Host architecture check using the CC command."""

  k = cc_macros()

  matchup = {
    '__x86_64__'  : 'x64',
    '__i386__'    : 'ia32',
    '__arm__'     : 'arm',
    '__mips__'    : 'mips',
  }

  rtn = 'ia32' # default

  for i in matchup:
    if i in k and k[i] != '0':
      rtn = matchup[i]
      break

  return rtn


def host_arch_win():
  """Host architecture check using environ vars (better way to do this?)"""

  arch = os.environ.get('PROCESSOR_ARCHITECTURE', 'x86')

  matchup = {
    'AMD64'  : 'x64',
    'x86'    : 'ia32',
    'arm'    : 'arm',
    'mips'   : 'mips',
  }

  return matchup.get(arch, 'ia32')


def compiler_version():
  try:
    proc = subprocess.Popen(shlex.split(CC) + ['--version'],
                            stdout=subprocess.PIPE)
  except WindowsError:
    return (0, False)

  is_clang = 'clang' in proc.communicate()[0].split('\n')[0]

  proc = subprocess.Popen(shlex.split(CC) + ['-dumpversion'],
                          stdout=subprocess.PIPE)
  version = tuple(map(int, proc.communicate()[0].split('.')))

  return (version, is_clang)

def configure_v8(o):
  o['variables']['v8_enable_gdbjit'] = 1 if options.gdb else 0
  o['variables']['v8_enable_i18n_support'] = 0  # Don't require libicu.
  o['variables']['v8_no_strict_aliasing'] = 1  # Work around compiler bugs.
  o['variables']['v8_optimized_debug'] = 0  # Compile with -O0 in debug builds.
  o['variables']['v8_random_seed'] = 0  # Use a random seed for hash tables.

def configure_node(o):
  if options.dest_os == 'android':
    o['variables']['OS'] = 'android'
  o['default_configuration'] = 'Debug' if options.debug else 'Release'

  host_arch = host_arch_win() if os.name == 'nt' else host_arch_cc()
  target_arch = options.dest_cpu or host_arch
  o['variables']['host_arch'] = host_arch
  o['variables']['target_arch'] = target_arch

  if target_arch == 'arm':
    configure_arm(o)

  cc_version, is_clang = compiler_version()
  o['variables']['clang'] = 1 if is_clang else 0

  if not is_clang and cc_version != 0:
    o['variables']['gcc_version'] = 10 * cc_version[0] + cc_version[1]

  # clang has always supported -fvisibility=hidden, right?
  if not is_clang and cc_version < (4,0,0):
    o['variables']['visibility'] = ''

# determine the "flavor" (operating system) we're building for,
# leveraging gyp's GetFlavor function
flavor_params = {}
if (options.dest_os):
  flavor_params['flavor'] = options.dest_os
flavor = GetFlavor(flavor_params)

output = {
  'variables': { 'python': sys.executable },
  'include_dirs': [],
  'libraries': [],
  'defines': [],
  'cflags': [],
}

configure_node(output)
configure_v8(output)

# variables should be a root level element,
# move everything else to target_defaults
variables = output['variables']
del output['variables']
output = {
  'variables': variables,
  'target_defaults': output
}
pprint.pprint(output, indent=2)

def write(filename, data):
  filename = os.path.join(root_dir, filename)
  print 'creating ', filename
  f = open(filename, 'w+')
  f.write(data)

write('config.gypi', '# Do not edit. Generated by the configure script.\n' +
      pprint.pformat(output, indent=2) + '\n')

config = {
  'BUILDTYPE': 'Debug' if options.debug else 'Release',
  'USE_XCODE': str(int(options.use_xcode or 0)),
  'PYTHON': sys.executable,
}

if options.prefix:
  config['PREFIX'] = options.prefix

config = '\n'.join(map('='.join, config.iteritems())) + '\n'

write('config.mk',
      '# Do not edit. Generated by the configure script.\n' + config)

if options.use_xcode:
  gyp_args = ['-f', 'xcode']
elif flavor == 'win':
  gyp_args = ['-f', 'msvs', '-G', 'msvs_version=auto']
else:
  gyp_args = ['-f', 'make-' + flavor]

subprocess.call([sys.executable, 'tools/run_gyp.py'] + gyp_args)