def get_emscripten_version(conf, cc):
	"""
	Emscripten doesn't support processing '-' like clang/gcc
	"""

	dummy = conf.cachedir.parent.make_node("waf-emscripten.c")
	dummy.write("")
	cmd = cc + ['-dM', '-E', '-x', 'c', dummy.abspath()]
	env = conf.env.env or None
	try:
		p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=env)
		out = p.communicate()[0]
	except Exception as e:
		conf.fatal('Could not determine emscripten version %r: %s' % (cmd, e))

	if not isinstance(out, str):
		out = out.decode(sys.stdout.encoding or 'iso8859-1')

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

	if not ('__clang__' in k and 'EMSCRIPTEN' in k):
		conf.fatal('Could not determine the emscripten compiler version.')

	conf.env.DEST_OS = 'generic'
	conf.env.DEST_BINFMT = 'elf'
	conf.env.DEST_CPU = 'asm-js'
	conf.env.CC_VERSION = (k['__clang_major__'], k['__clang_minor__'], k['__clang_patchlevel__'])
	return k

def check_fortran_clib(self, autoadd=True, *k, **kw):
    """
	Obtain the flags for linking with the C library
	if this check works, add uselib='CLIB' to your task generators
	"""
    if not self.env.FC_VERBOSE_FLAG:
        self.fatal("env.FC_VERBOSE_FLAG is not set: execute check_fortran_verbose_flag?")

    self.start_msg("Getting fortran runtime link flags")
    try:
        self.check_cc(
            fragment=FC_FRAGMENT2,
            compile_filename="test.f",
            features="fc fcprogram_test",
            linkflags=[self.env.FC_VERBOSE_FLAG],
        )
    except Exception:
        self.end_msg(False)
        if kw.get("mandatory", True):
            conf.fatal("Could not find the c library flags")
    else:
        out = self.test_bld.err
        flags = parse_fortran_link(out.splitlines())
        self.end_msg("ok (%s)" % " ".join(flags))
        self.env.LINKFLAGS_CLIB = flags
        return flags
    return []

def check_libdynamixel(conf, **kw):
    required = 'required' in kw and kw.get('required', False)
    includes_check = ['/usr/include', '/usr/local/include']
    resibots_dir = conf.options.resibots if hasattr(conf.options, 'resibots') and conf.options.resibots else None

    if resibots_dir:
        includes_check = [resibots_dir + '/include'] + includes_check

    if conf.options.libdynamixel:
        includes_check = [conf.options.libdynamixel + '/include'] + includes_check

    conf.start_msg('Checking for libdynamixel includes')
    try:
        res = conf.find_file('dynamixel/dynamixel.hpp', includes_check)
    except:
        res = False

    if res:
        conf.env.INCLUDES_LIBDYNAMIXEL = [os.path.expanduser(include) for include in includes_check]
        conf.env.DEFINES_LIBDYNAMIXEL = ['USE_LIBDYNAMIXEL']
        conf.end_msg('ok')
    else:
        if conf.options.libdynamixel and resibots_dir:
            msg = 'not found in %s nor in %s' % (conf.options.libdynamixel, resibots_dir)
        elif conf.options.libdynamixel or resibots_dir:
            msg = 'not found in %s' % (conf.options.libdynamixel if conf.options.libdynamixel else resibots_dir)
        else:
            msg = 'not found, use --libdynamixel=/path/to/libdynamixel or --resibots=/path/to/resibots'

        if required:
            conf.fatal(msg)
        else:
            conf.end_msg(msg, 'YELLOW')

def expand_bundle(conf,arg):
	if not arg:
		return[]
	arg=arg.split(',')
	if'NONE'in arg and'ALL'in arg:
		conf.fatal('Cannot specify both ALL and NONE as dependencies')
	candidate_score=dict([(name,0)for name in dependencies])
	def check_candidate(c):
		if c not in candidate_score:
			conf.fatal('Cannot bundle %s, since it is not specified as a'' dependency'%c)
	for a in arg:
		if a=='ALL':
			for candidate in candidate_score:
				candidate_score[candidate]+=1
			continue
		if a=='NONE':
			continue
		if a.startswith('-'):
			a=a[1:]
			check_candidate(a)
			candidate_score[a]-=1
		else:
			check_candidate(a)
			candidate_score[a]+=1
	candidates=[name for name in candidate_score if candidate_score[name]>0]
	return candidates

def find_dmd(conf):
	conf.find_program(['dmd','dmd2','ldc'],var='D')
	out=conf.cmd_and_log([conf.env.D,'--help'])
	if out.find("D Compiler v")==-1:
		out=conf.cmd_and_log([conf.env.D,'-version'])
		if out.find("based on DMD v1.")==-1:
			conf.fatal("detected compiler is not dmd/ldc")

def ecpp_setuptoolchain(conf, arch):
    global tool_prefixes

    arch = arch.lower()
    envname = 'toolchain_%s' % arch

    if envname not in conf.all_envs:
      conf.setenv(envname, conf.env)
      
      for prefix in tool_prefixes[arch]:
        try:
          conf.env.stash()
          conf.env['TOOL_PREFIX'] = prefix
          
          conf.load('gcc')
          conf.load('gxx')
          conf.load('gas')

          conf.find_program(['strip'],   var='STRIP')
          conf.find_program(['objcopy'], var='OBJCOPY')
          conf.find_program(['objdump'], var='OBJDUMP')
          conf.find_program(['nm'],      var='NM')

          conf.env.append_value('ASFLAGS',   ['-g'])
          conf.env.append_value('CFLAGS',    ['-g', '-Wall'])
          conf.env.append_value('CXXFLAGS',  ['-g', '-std=c++11','-Wall', '-ftemplate-depth=10000'])
        except conf.errors.ConfigurationError:
          conf.env.revert()
        else:
          break
      else:
        conf.fatal('Could not find a valid toolchain for "%s".' % arch)
    else:
      conf.setenv(envname)

def getoutput(conf,cmd,stdin=False):
	input=stdin and'\n'or None
	try:
		out,err=conf.cmd_and_log(cmd,env=conf.env.env or None,output=0,input=input)
	except Exception:
		conf.fatal('could not determine the compiler version %r'%cmd)
	return(out,err)

def find_msvc(conf):
	if sys.platform=='cygwin':
		conf.fatal('MSVC module does not work under cygwin Python!')
	v=conf.env
	path=v.PATH
	compiler=v.MSVC_COMPILER
	version=v.MSVC_VERSION
	compiler_name,linker_name,lib_name=_get_prog_names(conf,compiler)
	v.MSVC_MANIFEST=(compiler=='msvc'and version>=8)or(compiler=='wsdk'and version>=6)or(compiler=='intel'and version>=11)
	cxx=conf.find_program(compiler_name,var='CXX',path_list=path)
	env=dict(conf.environ)
	if path:env.update(PATH=';'.join(path))
	if not conf.cmd_and_log(cxx+['/nologo','/help'],env=env):
		conf.fatal('the msvc compiler could not be identified')
	v.CC=v.CXX=cxx
	v.CC_NAME=v.CXX_NAME='msvc'
	if not v.LINK_CXX:
		v.LINK_CXX=conf.find_program(linker_name,path_list=path,errmsg='%s was not found (linker)'%linker_name)
	if not v.LINK_CC:
		v.LINK_CC=v.LINK_CXX
	if not v.AR:
		stliblink=conf.find_program(lib_name,path_list=path,var='AR')
		if not stliblink:
			return
		v.ARFLAGS=['/nologo']
	if v.MSVC_MANIFEST:
		conf.find_program('MT',path_list=path,var='MT')
		v.MTFLAGS=['/nologo']
	try:
		conf.load('winres')
	except Errors.ConfigurationError:
		Logs.warn('Resource compiler not found. Compiling resource file is disabled')

def check_omni_vrep(conf, **kw):
    required = 'required' in kw and kw.get('required', False)
    includes_check = ['/usr/include', '/usr/local/include']
    resibots_dir = conf.options.resibots if hasattr(conf.options, 'resibots') and conf.options.resibots else None

    if resibots_dir:
        includes_check = [resibots_dir + '/include'] + includes_check

    if conf.options.omni_vrep:
        includes_check = [conf.options.omni_vrep + '/include'] + includes_check

    conf.start_msg('Checking for omni_vrep includes')
    try:
        res = conf.find_file('omni_vrep/omnipointer.hpp', includes_check)
    except:
        res = False

    if res:
        conf.env.INCLUDES_OMNI_VREP = [os.path.expanduser(include) for include in includes_check]
        conf.env.DEFINES_OMNI_VREP = ['USE_OMNI_VREP']
        conf.end_msg('ok')
    else:
        if conf.options.omni_vrep and resibots_dir:
            msg = 'not found in %s nor in %s' % (conf.options.omni_vrep, resibots_dir)
        elif conf.options.omni_vrep or resibots_dir:
            msg = 'not found in %s' % (conf.options.omni_vrep if conf.options.omni_vrep else resibots_dir)
        else:
            msg = 'not found, use --omni_vrep=/path/to/omni_vrep or --resibots=/path/to/resibots'

        if required:
            conf.fatal(msg)
        else:
            conf.end_msg(msg, 'YELLOW')

def setup_ifort(conf, versiondict):
	"""
	Checks installed compilers and targets and returns the first combination from the user's
	options, env, or the global supported lists that checks.

	:param versiondict: dict(platform -> dict(architecture -> configuration))
	:type versiondict: dict(string -> dict(string -> target_compiler)
	:return: the compiler, revision, path, include dirs, library paths and target architecture
	:rtype: tuple of strings
	"""
	platforms = Utils.to_list(conf.env.MSVC_TARGETS) or [i for i,j in all_ifort_platforms]
	desired_versions = conf.env.MSVC_VERSIONS or list(reversed(list(versiondict.keys())))
	for version in desired_versions:
		try:
			targets = versiondict[version]
		except KeyError:
			continue
		for arch in platforms:
			try:
				cfg = targets[arch]
			except KeyError:
				continue
			cfg.evaluate()
			if cfg.is_valid:
				compiler,revision = version.rsplit(' ', 1)
				return compiler,revision,cfg.bindirs,cfg.incdirs,cfg.libdirs,cfg.cpu
	conf.fatal('ifort: Impossible to find a valid architecture for building %r - %r' % (desired_versions, list(versiondict.keys())))

def check_cython_version(conf, minver):
    conf.start_msg("Checking cython version")
    minver = tuple(minver)
    import re
    version_re = re.compile(r'cython\s*version\s*(?P<major>\d*)\.(?P<minor>\d*)(?:\.(?P<micro>\d*))?', re.I).search
    cmd = conf.cmd_to_list(conf.env['CYTHON'])
    cmd = cmd + ['--version']
    from waflib.Tools import fc_config
    stdout, stderr = fc_config.getoutput(conf, cmd)
    if stdout:
        match = version_re(stdout)
    else:
        match = version_re(stderr)
    if not match:
        conf.fatal("cannot determine the Cython version")
    cy_ver = [match.group('major'), match.group('minor')]
    if match.group('micro'):
        cy_ver.append(match.group('micro'))
    else:
        cy_ver.append('0')
    cy_ver = tuple([int(x) for x in cy_ver])
    if cy_ver < minver:
        conf.end_msg(False)
        conf.fatal("cython version %s < %s" % (cy_ver, minver))
    conf.end_msg(str(cy_ver))

def get_pgfortran_version(conf,fc):
		version_re = re.compile(r"The Portland Group", re.I).search
		cmd = fc + ['-V']
		out,err = fc_config.getoutput(conf, cmd, stdin=False)
		if out: match = version_re(out)
		else: match = version_re(err)
		if not match:
				conf.fatal('Could not verify PGI signature')
		cmd = fc + ['-help=variable']
		out,err = fc_config.getoutput(conf, cmd, stdin=False)
		if out.find('COMPVER')<0:
				conf.fatal('Could not determine the compiler type')
		k = {}
		prevk = ''
		out = out.split('\n')
		for line in out:
				lst = line.partition('=')
				if lst[1] == '=':
						key = lst[0].rstrip()
						if key == '': key = prevk
						val = lst[2].rstrip()
						k[key] = val
				else: prevk = line.partition(' ')[0]
		def isD(var):
				return var in k
		def isT(var):
				return var in k and k[var]!='0'
		conf.env['FC_VERSION'] = (k['COMPVER'].split('.'))

def get_suncc_version(conf, cc):
	"""
	Returns the Sun compiler version

	:raise: :py:class:`waflib.Errors.ConfigurationError`
	"""
	cmd = cc + ['-V']
	try:
		out, err = conf.cmd_and_log(cmd, output=0)
	except Errors.WafError as e:
		# Older versions of the compiler exit with non-zero status when reporting their version
		if not (hasattr(e, 'returncode') and hasattr(e, 'stdout') and hasattr(e, 'stderr')):
			conf.fatal('Could not find suncc %r' % cmd)
		out = e.stdout
		err = e.stderr

	version = (out or err)
	version = version.splitlines()[0]

	# cc: Sun C 5.10 SunOS_i386 2009/06/03
	# cc: Studio 12.5 Sun C++ 5.14 SunOS_sparc Beta 2015/11/17
	# cc: WorkShop Compilers 5.0 98/12/15 C 5.0
	version_re = re.compile(r'cc: (studio.*?|\s+)?(sun\s+(c\+\+|c)|(WorkShop\s+Compilers))?\s+(?P<major>\d*)\.(?P<minor>\d*)', re.I).search
	match = version_re(version)
	if match:
		k = match.groupdict()
		conf.env.CC_VERSION = (k['major'], k['minor'])
	else:
		conf.fatal('Could not determine the suncc version.')

def getoutput(conf, cmd, stdin=False):
	"""
	Obtains Fortran command outputs
	"""
	from waflib import Errors
	if conf.env.env:
		env = conf.env.env
	else:
		env = dict(os.environ)
		env['LANG'] = 'C'
	input = stdin and '\n'.encode() or None
	try:
		out, err = conf.cmd_and_log(cmd, env=env, output=0, input=input)
	except Errors.WafError as e:
		# An WafError might indicate an error code during the command
		# execution, in this case we still obtain the stderr and stdout,
		# which we can use to find the version string.
		if not (hasattr(e, 'stderr') and hasattr(e, 'stdout')):
			raise e
		else:
			# Ignore the return code and return the original
			# stdout and stderr.
			out = e.stdout
			err = e.stderr
	except Exception:
		conf.fatal('could not determine the compiler version %r' % cmd)
	return (out, err)

def check_fortran_clib(self, autoadd=True, *k, **kw):
	"""
	Obtain flags for linking with the c library
	if this check works, add uselib='CLIB' to your task generators
	"""
	if not self.env.FC_VERBOSE_FLAG:
		self.fatal('env.FC_VERBOSE_FLAG is not set: execute check_fortran_verbose_flag?')

	self.start_msg('Getting fortran runtime link flags')
	try:
		self.check_cc(
			fragment = FC_FRAGMENT2,
			compile_filename = 'test.f',
			features = 'fc fcprogram_test',
			linkflags = [self.env.FC_VERBOSE_FLAG]
		)
	except:
		self.end_msg(False)
		if kw.get('mandatory', True):
			conf.fatal('Could not find the c library flags')
	else:
		out = self.test_bld.err
		flags = parse_fortran_link(out.splitlines())
		self.end_msg('ok (%s)' % ' '.join(flags))
		self.env.CLIB_LINKFLAGS = flags
		return flags
	return []

def configure(conf):

    # Which mkspec should we use, by default, use the cxx_default
    # that simply fallbacks to use waf auto detect of compiler etc.
    mkspec = "cxx_default"

    if conf.has_tool_option('cxx_mkspec'):
        mkspec = conf.get_tool_option('cxx_mkspec')

    conf.msg('Using the mkspec:', mkspec)

    # Find and call the mkspec function on the conf object
    if hasattr(conf, mkspec):
        getattr(conf, mkspec)()
    else:
        conf.fatal("The mkspec is not available: {0}".format(mkspec))

    # Additional flags for C/C++ compiler and linker
    if conf.has_tool_option('cflags'):
        conf.env['CFLAGS'] += conf.get_tool_option('cflags').split(';')
    if conf.has_tool_option('cxxflags'):
        conf.env['CXXFLAGS'] += conf.get_tool_option('cxxflags').split(';')
    if conf.has_tool_option('linkflags'):
        conf.env['LINKFLAGS'] += conf.get_tool_option('linkflags').split(';')

    # Common flags to be set for C/C++ compiler and linker
    if conf.has_tool_option('commonflags'):
        conf.env['CFLAGS'] += conf.get_tool_option('commonflags').split(';')
        conf.env['CXXFLAGS'] += conf.get_tool_option('commonflags').split(';')
        conf.env['LINKFLAGS'] += conf.get_tool_option('commonflags').split(';')

def setup_msvc(conf,versions,arch=False):
	platforms=getattr(Options.options,'msvc_targets','').split(',')
	if platforms==['']:
		platforms=Utils.to_list(conf.env['MSVC_TARGETS'])or[i for i,j in all_msvc_platforms+all_icl_platforms+all_wince_platforms]
	desired_versions=getattr(Options.options,'msvc_version','').split(',')
	if desired_versions==['']:
		desired_versions=conf.env['MSVC_VERSIONS']or[v for v,_ in versions][::-1]
	versiondict=dict(versions)
	for version in desired_versions:
		try:
			targets=dict(versiondict[version])
			for target in platforms:
				try:
					try:
						realtarget,(p1,p2,p3)=targets[target]
					except conf.errors.ConfigurationError:
						del(targets[target])
					else:
						compiler,revision=version.rsplit(' ',1)
						if arch:
							return compiler,revision,p1,p2,p3,realtarget
						else:
							return compiler,revision,p1,p2,p3
				except KeyError:continue
		except KeyError:continue
	conf.fatal('msvc: Impossible to find a valid architecture for building (in setup_msvc)')

def get_python_variables(conf,variables,imports=['import sys']):
	program=list(imports)
	program.append('')
	for v in variables:
		program.append("print(repr(%s))"%v)
	os_env=dict(os.environ)
	try:
		del os_env['MACOSX_DEPLOYMENT_TARGET']
	except KeyError:
		pass
	try:
		out=conf.cmd_and_log(conf.env.PYTHON+['-c','\n'.join(program)],env=os_env)
	except Errors.WafError:
		conf.fatal('The distutils module is unusable: install "python-devel"?')
	return_values=[]
	for s in out.split('\n'):
		s=s.strip()
		if not s:
			continue
		if s=='None':
			return_values.append(None)
		elif s[0]=="'"and s[-1]=="'":
			return_values.append(s[1:-1])
		elif s[0].isdigit():
			return_values.append(int(s))
		else:break
	return return_values

def find_ifort_win32(conf):
	v=conf.env
	path=v.PATH
	compiler=v.MSVC_COMPILER
	version=v.MSVC_VERSION
	compiler_name,linker_name,lib_name=_get_prog_names(conf,compiler)
	v.IFORT_MANIFEST=(compiler=='intel'and version>=11)
	fc=conf.find_program(compiler_name,var='FC',path_list=path)
	env=dict(conf.environ)
	if path:env.update(PATH=';'.join(path))
	if not conf.cmd_and_log(fc+['/nologo','/help'],env=env):
		conf.fatal('not intel fortran compiler could not be identified')
	v.FC_NAME='IFORT'
	if not v.LINK_FC:
		conf.find_program(linker_name,var='LINK_FC',path_list=path,mandatory=True)
	if not v.AR:
		conf.find_program(lib_name,path_list=path,var='AR',mandatory=True)
		v.ARFLAGS=['/nologo']
	if v.IFORT_MANIFEST:
		conf.find_program('MT',path_list=path,var='MT')
		v.MTFLAGS=['/nologo']
	try:
		conf.load('winres')
	except Errors.WafError:
		Logs.warn('Resource compiler not found. Compiling resource file is disabled')

def get_gfortran_version(conf,fc):
	version_re=re.compile(r"GNU\s*Fortran",re.I).search
	cmd=fc+['--version']
	out,err=fc_config.getoutput(conf,cmd,stdin=False)
	if out:match=version_re(out)
	else:match=version_re(err)
	if not match:
		conf.fatal('Could not determine the compiler type')
	cmd=fc+['-dM','-E','-']
	out,err=fc_config.getoutput(conf,cmd,stdin=True)
	if out.find('__GNUC__')<0:
		conf.fatal('Could not determine the compiler type')
	k={}
	out=out.split('\n')
	import shlex
	for line in out:
		lst=shlex.split(line)
		if len(lst)>2:
			key=lst[1]
			val=lst[2]
			k[key]=val
	def isD(var):
		return var in k
	def isT(var):
		return var in k and k[var]!='0'
	conf.env['FC_VERSION']=(k['__GNUC__'],k['__GNUC_MINOR__'],k['__GNUC_PATCHLEVEL__'])