emcmake.py

#!/usr/bin/env python3
# Copyright 2016 The Emscripten Authors.  All rights reserved.
# Emscripten is available under two separate licenses, the MIT license and the
# University of Illinois/NCSA Open Source License.  Both these licenses can be
# found in the LICENSE file.

import sys
from tools import building
from tools import shared
from tools import config
from tools import utils
from subprocess import CalledProcessError


#
# Main run() function
#
def run():
  if len(sys.argv) < 2 or sys.argv[1] in ('--version', '--help'):
    print('''\
emcmake is a helper for cmake, setting various environment
variables so that emcc etc. are used. Typical usage:

  emcmake cmake [FLAGS]
''', file=sys.stderr)
    return 1

  args = sys.argv[1:]
  env = building.get_building_env()

  def has_substr(args, substr):
    return any(substr in s for s in args)

  # Append the Emscripten toolchain file if the user didn't specify one.
  if not has_substr(args, '-DCMAKE_TOOLCHAIN_FILE'):
    args.append('-DCMAKE_TOOLCHAIN_FILE=' + utils.path_from_root('cmake', 'Modules', 'Platform', 'Emscripten.cmake'))

  if not has_substr(args, '-DCMAKE_CROSSCOMPILING_EMULATOR'):
    node_js = config.NODE_JS[0]
    args.append(f'-DCMAKE_CROSSCOMPILING_EMULATOR={node_js}')

  # On Windows specify MinGW Makefiles or ninja if we have them and no other
  # toolchain was specified, to keep CMake from pulling in a native Visual
  # Studio, or Unix Makefiles.
  if utils.WINDOWS and '-G' not in args:
    if utils.which('mingw32-make'):
      args += ['-G', 'MinGW Makefiles']
    elif utils.which('ninja'):
      args += ['-G', 'Ninja']

  # CMake has a requirement that it wants sh.exe off PATH if MinGW Makefiles
  # is being used. This happens quite often, so do this automatically on
  # behalf of the user. See
  # http://www.cmake.org/Wiki/CMake_MinGW_Compiler_Issues
  if utils.WINDOWS and 'MinGW Makefiles' in args:
    env = building.remove_sh_exe_from_path(env)

  print('configure: ' + shared.shlex_join(args), file=sys.stderr)
  try:
    shared.check_call(args, env=env)
    return 0
  except CalledProcessError as e:
    return e.returncode


if __name__ == '__main__':
  sys.exit(run())