text: #!/usr/bin/env python
  # encoding: utf-8
  # Matthias Jahn jahn dôt matthias ât freenet dôt de, 2007 (pmarat)
  
  import os, sys, imp, types, ccroot
  import optparse
  import Utils, Configure, Options
  from Logs import debug
  
  c_compiler = {
  	'win32':  ['msvc', 'gcc'],
  	'cygwin': ['gcc'],
  	'darwin': ['gcc'],
  	'aix':    ['xlc', 'gcc'],
  	'linux':  ['gcc', 'icc', 'suncc'],
  	'sunos':  ['gcc', 'suncc'],
  	'irix':   ['gcc'],
  	'hpux':   ['gcc'],
  	'default': ['gcc']
  }
  
  def __list_possible_compiler(platform):
  	try:
  		return c_compiler[platform]
  	except KeyError:
  		return c_compiler["default"]
  
  def detect(conf):
  	"""
  	for each compiler for the platform, try to configure the compiler
  	in theory the tools should raise a configuration error if the compiler
  	pretends to be something it is not (setting CC=icc and trying to configure gcc)
  	"""
  	try: test_for_compiler = Options.options.check_c_compiler
  	except AttributeError: conf.fatal("Add set_options(opt): opt.tool_options('compiler_cc')")
  	orig = conf.env
  	for compiler in test_for_compiler.split():
  		conf.env = orig.copy()
  		try:
  			conf.check_tool(compiler)
  		except Configure.ConfigurationError, e:
  			debug('compiler_cc: %r' % e)
  		else:
  			if conf.env['CC']:
  				orig.table = conf.env.get_merged_dict()
  				conf.env = orig
  				conf.check_message(compiler, '', True)
  				conf.env['COMPILER_CC'] = compiler
  				break
  			conf.check_message(compiler, '', False)
  			break
  	else:
  		conf.fatal('could not configure a c compiler!')
  
  def set_options(opt):
  	build_platform = Utils.unversioned_sys_platform()
  	possible_compiler_list = __list_possible_compiler(build_platform)
  	test_for_compiler = ' '.join(possible_compiler_list)
  	cc_compiler_opts = opt.add_option_group("C Compiler Options")
  	cc_compiler_opts.add_option('--check-c-compiler', default="%s" % test_for_compiler,
  		help='On this platform (%s) the following C-Compiler will be checked by default: "%s"' % (build_platform, test_for_compiler),
  		dest="check_c_compiler")
  
  	for c_compiler in test_for_compiler.split():
  		opt.tool_options('%s' % c_compiler, option_group=cc_compiler_opts)
  
  