# -*- mode: python; python-indent-offset: 4; indent-tabs-mode: nil -*-
##
# This script includes generic build options:
#    release/debug, target os, target arch, cross toolchain, build environment etc
##
import os
import platform

project_version = '1.3.0'

# Map of host os and allowed target os (host: allowed target os)
host_target_map = {
    'linux': ['linux', 'android', 'arduino', 'yocto', 'tizen'],
    'windows': ['windows', 'android', 'arduino'],
    'darwin': ['darwin', 'ios', 'android', 'arduino'],
    'msys_nt' :['msys_nt'],
}

# Map of os and allowed archs (os: allowed archs)
os_arch_map = {
    'linux': ['x86', 'x86_64', 'arm', 'arm-v7a', 'armeabi-v7a', 'arm64', 'mips', 'mipsel', 'mips64', 'mips64el', 'i386', 'powerpc', 'sparc', 'aarch64'],
    'tizen': ['x86', 'x86_64', 'arm', 'arm-v7a', 'armeabi-v7a', 'arm64'],
    'android': ['x86', 'x86_64', 'armeabi', 'armeabi-v7a', 'armeabi-v7a-hard', 'arm64-v8a'],
    'windows': ['x86', 'amd64', 'arm'],
    'msys_nt':['x86', 'x86_64'],
    'darwin': ['i386', 'x86_64'],
    'ios': ['i386', 'x86_64', 'armv7', 'armv7s', 'arm64'],
    'arduino': ['avr', 'arm'],
    'yocto': ['i586', 'i686', 'x86_64', 'arm', 'aarch64', 'powerpc', 'powerpc64', 'mips', 'mipsel'],
}

host = platform.system().lower()

# the host string contains version of windows. 6.3, 6.4, 10.0 which is 8.0, 8.1, and 10 respectively.
# Let's canonicalize the msys_nt-XX.X system name by stripping version off.
if 'msys_nt' in host:
    host = 'msys_nt'

if host not in host_target_map:
    print "\nError: Current system (%s) isn't supported\n" % host
    Exit(1)

######################################################################
# Get build options (the optins from command line)
######################################################################
target_os = ARGUMENTS.get('TARGET_OS', host).lower() # target os

if target_os not in host_target_map[host]:
    print "\nError: Unknown target os: %s (Allow values: %s)\n" % (target_os, host_target_map[host])
    Exit(1)

if target_os == 'android':
    default_arch = 'x86'
else:
    default_arch = platform.machine()
    if target_os == 'windows':
        default_arch = default_arch.lower()

target_arch = ARGUMENTS.get('TARGET_ARCH', default_arch) # target arch

# True if binary needs to be installed on board. (Might need root permissions)
# set to 'no', 'false' or 0 for only compilation
require_upload = ARGUMENTS.get('UPLOAD', False)

# Get the device name. This name can be used as network display name wherever possible
device_name = ARGUMENTS.get('DEVICE_NAME', "OIC-DEVICE")

default_with_upstream_libcoap = 0

if ARGUMENTS.get('TEST'):
    logging_default = False
else:
    release_mode = False
    if ARGUMENTS.get('RELEASE', True) in ['y', 'yes', 'true', 't', '1', 'on', 'all', True]:
        release_mode = True
    logging_default = (release_mode == False)

# targets that do not support the DTLS build (SECURED=1 build option)
targets_without_dtls_support = ['arduino'];
if ARGUMENTS.get('SECURED') == '1' and target_os in targets_without_dtls_support:
	print "\nError: DTLS not supported on target os: %s MUST build with SECURED=0\n" % (target_os)
	Exit(1)

######################################################################
# Common build options (release, target os, target arch)
######################################################################
targets_disallow_multitransport = ['arduino']

help_vars = Variables()

help_vars.Add('PROJECT_VERSION', 'The version of IoTivity', project_version)

help_vars.Add(BoolVariable('VERBOSE', 'Show compilation', False))
help_vars.Add(BoolVariable('RELEASE', 'Build for release?', True)) # set to 'no', 'false' or 0 for debug
help_vars.Add(EnumVariable('TARGET_OS', 'Target platform', host, host_target_map[host]))


help_vars.Add(BoolVariable('WITH_RA', 'Build with Remote Access module', False))
help_vars.Add(BoolVariable('WITH_TCP', 'Build with TCP adapter', False))
help_vars.Add(BoolVariable('WITH_PROXY', 'Build with CoAP-HTTP Proxy', False))
help_vars.Add(ListVariable('WITH_MQ', 'Build with MQ publisher/broker', 'OFF', ['OFF', 'SUB', 'PUB', 'BROKER']))
help_vars.Add(BoolVariable('WITH_CLOUD', 'Build including AccountManager class and Cloud Client sample', False))
help_vars.Add(ListVariable('RD_MODE', 'Resource Directory build mode', 'CLIENT', ['CLIENT', 'SERVER']))

help_vars.Add(BoolVariable('SIMULATOR', 'Build with simulator module', False))

help_vars.Add(BoolVariable('WITH_RA_IBB', 'Build with Remote Access module(workssys)', False))


if target_os in targets_disallow_multitransport:
    help_vars.Add(ListVariable('TARGET_TRANSPORT', 'Target transport', 'IP', ['BT', 'BLE', 'IP', 'NFC']))
else:
    help_vars.Add(ListVariable('TARGET_TRANSPORT', 'Target transport', 'ALL', ['ALL', 'BT', 'BLE', 'IP', 'NFC']))

help_vars.Add(EnumVariable('TARGET_ARCH', 'Target architecture', default_arch, os_arch_map[target_os]))
if target_os in targets_without_dtls_support:
    help_vars.Add(EnumVariable('SECURED', 'Build with DTLS', '0', allowed_values=('0', '1')))
else:
    help_vars.Add(EnumVariable('SECURED', 'Build with DTLS', '1', allowed_values=('0', '1')))
help_vars.Add(EnumVariable('MULTIPLE_OWNER', 'Enable multiple owner', '0', allowed_values=('0', '1')))
help_vars.Add(EnumVariable('EXC_PROV_SUPPORT', 'Except OCPMAPI library(libocpmapi.so)', '0', allowed_values=('0', '1')))
help_vars.Add(EnumVariable('TEST', 'Run unit tests', '0', allowed_values=('0', '1')))
help_vars.Add(BoolVariable('LOGGING', 'Enable stack logging', logging_default))
help_vars.Add(EnumVariable('LOG_LEVEL', 'Enable stack logging level', 'DEBUG', allowed_values=('DEBUG', 'INFO', 'ERROR', 'WARNING', 'FATAL')))
help_vars.Add(BoolVariable('UPLOAD', 'Upload binary ? (For Arduino)', require_upload))
help_vars.Add(EnumVariable('ROUTING', 'Enable routing', 'EP', allowed_values=('GW', 'EP')))
help_vars.Add(EnumVariable('BUILD_SAMPLE', 'Build with sample', 'ON', allowed_values=('ON', 'OFF')))
help_vars.AddVariables(('DEVICE_NAME', 'Network display name for device (For Arduino)', device_name, None, None),)
help_vars.Add(PathVariable('ANDROID_NDK', 'Android NDK path', None, PathVariable.PathAccept))
help_vars.Add(PathVariable('ANDROID_HOME', 'Android SDK path', None, PathVariable.PathAccept))
help_vars.Add(PathVariable('ANDROID_GRADLE', 'Gradle binary file', None, PathVariable.PathIsFile))
help_vars.Add(EnumVariable('WITH_UPSTREAM_LIBCOAP', 'Use latest stable version of LibCoAP downloaded from github', default_with_upstream_libcoap, allowed_values=('0','1')))
help_vars.Add(BoolVariable('WITH_ENV', 'Use compiler options from environment', False))
help_vars.Add(BoolVariable('AUTOMATIC_UPDATE', 'Makes libcoap update automatically to the required versions if needed.', False))

if target_os == 'windows':
	# For VS2013, MSVC_VERSION is '12.0'. For VS2015, MSVC_VERSION is '14.0'.
	# Default value is None, meaning that SCons has to choose automatically a VS version.
	help_vars.Add(EnumVariable('MSVC_VERSION', 'MSVC compiler version - Windows', None, allowed_values=('12.0', '14.0')))
	help_vars.Add(EnumVariable('UWP_APP', 'Build for a Universal Windows Platform (UWP) Application', '0', allowed_values=('0', '1')))

help_vars.Add(BoolVariable('BUILD_JAVA', 'Build Java bindings', False))
help_vars.Add(PathVariable('JAVA_HOME', 'JDK directory', os.environ.get('JAVA_HOME'), PathVariable.PathAccept))
help_vars.Add(EnumVariable('OIC_SUPPORT_TIZEN_TRACE', 'Tizen Trace(T-trace) api availability', 'False', allowed_values=('True', 'False')))

AddOption('--prefix',
                  dest='prefix',
                  type='string',
                  nargs=1,
                  action='store',
                  metavar='DIR',
                  help='installation prefix')

######################################################################
# Platform(build target) specific options: SDK/NDK & toolchain
######################################################################
targets_support_cc = ['linux', 'arduino', 'tizen']

if target_os in targets_support_cc:
    # Set cross compile toolchain
    help_vars.Add('TC_PREFIX', "Toolchain prefix (Generally only be required for cross-compiling)", os.environ.get('TC_PREFIX'))
    help_vars.Add(PathVariable('TC_PATH',
            'Toolchain path (Generally only be required for cross-compiling)',
            os.environ.get('TC_PATH')))

if target_os in ['android', 'arduino']: # Android/Arduino always uses GNU compiler regardless of the host
    env = Environment(variables = help_vars,
            tools = ['gnulink', 'gcc', 'g++', 'ar', 'as', 'textfile']
            )
else:
    env = Environment(variables = help_vars, tools = ['default', 'textfile'],
            TARGET_ARCH = target_arch, TARGET_OS = target_os,
            PREFIX = GetOption('prefix'),
            LIB_INSTALL_DIR = ARGUMENTS.get('LIB_INSTALL_DIR') #for 64bit build
            )

Help(help_vars.GenerateHelpText(env))

if env.get('WITH_ENV'):
    env['ENV'] = os.environ
    if 'CC' in os.environ:
        env['CC'] = Split(os.environ['CC'])
        print "using CC from environment: %s" % env['CC']
    if 'CXX' in os.environ:
        env['CXX'] = Split(os.environ['CXX'])
        print "using CXX from environment: %s" % env['CXX']
    if 'CFLAGS' in os.environ:
        env['CFLAGS'] = Split(os.environ['CFLAGS'])
        print "using CFLAGS from environment: %s" % env['CFLAGS']
    if 'CXXFLAGS' in os.environ:
        env['CXXFLAGS'] = Split(os.environ['CXXFLAGS'])
        print "using CXXFLAGS from environment: %s" % env['CXXFLAGS']
    if 'CCFLAGS' in os.environ:
        env['CCFLAGS'] = Split(os.environ['CCFLAGS'])
        print "using CCFLAGS from environment: %s" % env['CCFLAGS']
    if 'CPPFLAGS' in os.environ:
        env['CPPFLAGS'] = Split(os.environ['CPPFLAGS'])
        print "using CPPFLAGS from environment: %s" % env['CPPFLAGS']
    if 'LDFLAGS' in os.environ:
        env['LINKFLAGS'] = Split(os.environ['LDFLAGS'])
        print "using LDFLAGS/LINKFLAGS from environment: %s" % env['LINKFLAGS']

tc_set_msg = '''
************************************ Warning **********************************
*   Environment variable TC_PREFIX/TC_PATH is set. It will change the default *
* toolchain, if it isn't what you expect you should unset it, otherwise it may*
* cause inexplicable errors.                                                  *
*******************************************************************************
'''
if env.get('VERBOSE') == False:
    env['CCCOMSTR'] = "Compiling $TARGET"
    env['SHCCCOMSTR'] = "Compiling $TARGET"
    env['CXXCOMSTR'] = "Compiling $TARGET"
    env['SHCXXCOMSTR'] = "Compiling $TARGET"
    env['LINKCOMSTR'] = "Linking $TARGET"
    env['SHLINKCOMSTR'] = "Linking $TARGET"
    env['ARCOMSTR'] = "Archiving $TARGET"
    env['RANLIBCOMSTR'] = "Indexing Archive $TARGET"

if target_os in targets_support_cc:
    prefix = env.get('TC_PREFIX')
    tc_path = env.get('TC_PATH')
    if prefix:
        env.Replace(CC = prefix + env.get('CC', 'gcc'))
        env.Replace(CXX = prefix + env.get('CXX', 'g++'))
        env.Replace(AR = prefix + env.get('AR', 'ar'))
        env.Replace(AS = prefix + env.get('AS', 'as'))
        env.Replace(RANLIB = prefix + env.get('RANLIB', 'ranlib'))

    if tc_path:
        env.PrependENVPath('PATH', tc_path)
        sys_root = os.path.abspath(tc_path + '/../')
        env.AppendUnique(CCFLAGS = ['--sysroot=' + sys_root])
        env.AppendUnique(LINKFLAGS = ['--sysroot=' + sys_root])

    if prefix or tc_path:
        print tc_set_msg

# Import env variables only if reproductibility is ensured
if target_os in ['yocto']:
    env['CONFIG_ENVIRONMENT_IMPORT'] = True
else:
    env['CONFIG_ENVIRONMENT_IMPORT'] = False

if env['CONFIG_ENVIRONMENT_IMPORT'] == True:
    print "warning: importing some environment variables for OS: %s" % target_os
    for ev in ['PATH', 'PKG_CONFIG', 'PKG_CONFIG_PATH', 'PKG_CONFIG_SYSROOT_DIR']:
        if os.environ.get(ev) != None:
            env['ENV'][ev] = os.environ.get(ev)
    if os.environ['LDFLAGS'] != None:
        env.AppendUnique(LINKFLAGS = Split(os.environ['LDFLAGS']))

# Ensure scons be able to change its working directory
env.SConscriptChdir(1)

# Set the source directory and build directory
#   Source directory: 'dir'
#   Build directory: 'dir'/out/<target_os>/<target_arch>/<release or debug>/
#   On windows, the build directory will be:
#     'dir'/out/windows/<win32 or uwp>/<target_arch>/<release or debug>/
#
# You can get the directory as following:
#   env.get('SRC_DIR')
#   env.get('BUILD_DIR')

def __set_dir(env, dir):
    if not os.path.exists(dir + '/SConstruct'):
        print '''
*************************************** Error *********************************
* The directory(%s) seems isn't a source code directory, no SConstruct file is
* found. *
*******************************************************************************
''' % dir
        Exit(1)

    build_dir = dir + '/out/' + target_os + '/'

    if target_os == 'windows':
        if env.get('UWP_APP') == '1':
            build_dir = build_dir + 'uwp/'
        else:
            build_dir = build_dir + 'win32/'

    build_dir = build_dir + target_arch

    if env.get('RELEASE'):
        build_dir = build_dir + '/release/'
    else:
        build_dir = build_dir + '/debug/'

    env.VariantDir(build_dir, dir, duplicate=0)

    env.Replace(BUILD_DIR = build_dir)
    env.Replace(SRC_DIR = dir)

def __src_to_obj(env, src, home = ''):
    obj = env.get('BUILD_DIR') + src.replace(home, '')
    if env.get('OBJSUFFIX'):
        obj += env.get('OBJSUFFIX')
    return env.Object(obj, src)

def __install(ienv, targets, name):
    i_n = ienv.Install(env.get('BUILD_DIR'), targets)
    Alias(name, i_n)
    env.AppendUnique(TS = [name])

def __installlib(ienv, targets, name):
    user_prefix = env.get('PREFIX')
    if user_prefix:
        user_lib = env.get('LIB_INSTALL_DIR')
        if user_lib:
            i_n = ienv.Install(user_lib, targets)
        else:
            i_n = ienv.Install(user_prefix + '/lib', targets)
        ienv.Alias("install", i_n)
    else:
        i_n = ienv.Install(env.get('BUILD_DIR'), targets)
    ienv.Alias("install", i_n)

def __installbin(ienv, targets, name):
    user_prefix = env.get('PREFIX')
    if user_prefix:
        i_n = ienv.Install(user_prefix + '/bin', targets)
        ienv.Alias("install", i_n)

def __installheader(ienv, targets, dir, name):
    user_prefix = env.get('PREFIX')
    if user_prefix:
        i_n = ienv.Install(user_prefix + '/include/' + dir ,targets)
    else:
        i_n = ienv.Install(os.path.join(env.get('BUILD_DIR'), 'include', dir), targets)
    ienv.Alias("install", i_n)

def __installpcfile(ienv, targets, name):
    user_prefix = env.get('PREFIX')
    if user_prefix:
        user_lib = env.get('LIB_INSTALL_DIR')
        if user_lib:
            i_n = ienv.Install(user_lib + '/pkgconfig', targets)
        else:
            i_n = ienv.Install(user_prefix + '/lib/pkgconfig', targets)
    else:
        i_n = ienv.Install(env.get('BUILD_DIR') + 'lib/pkgconfig', targets)
    ienv.Alias("install", i_n)

def __append_target(ienv, name, targets = None):
    if targets:
        env.Alias(name, targets)
    env.AppendUnique(TS = [name])

def __print_targets(env):
    Help('''
===============================================================================
Targets:\n    ''')
    for t in env.get('TS'):
        Help(t + ' ')
    Help('''
\nDefault all targets will be built. You can specify the target to build:

    $ scons [options] [target]
===============================================================================
''')

env.AddMethod(__set_dir, 'SetDir')
env.AddMethod(__print_targets, 'PrintTargets')
env.AddMethod(__src_to_obj, 'SrcToObj')
env.AddMethod(__append_target, 'AppendTarget')
env.AddMethod(__install, 'InstallTarget')
env.AddMethod(__installlib, 'UserInstallTargetLib')
env.AddMethod(__installbin, 'UserInstallTargetBin')
env.AddMethod(__installheader, 'UserInstallTargetHeader')
env.AddMethod(__installpcfile, 'UserInstallTargetPCFile')
env.SetDir(env.GetLaunchDir())
env['ROOT_DIR']=env.GetLaunchDir()+'/..'

Export('env')

######################################################################
# Scons to generate the iotivity.pc file from iotivity.pc.in file
######################################################################
pc_file = env.get('SRC_DIR') + '/iotivity.pc.in'

user_prefix = env.get('PREFIX')
user_lib = env.get('LIB_INSTALL_DIR')

if not user_prefix:
    user_prefix = env.get('BUILD_DIR').encode('string_escape')

if not user_lib:
    user_lib = '$${prefix}/lib'

defines = []
if env.get('LOGGING'):
    defines.append('-DTB_LOG=1')

if env.get('ROUTING') == 'GW':
    defines.append('-DROUTING_GATEWAY=1')
elif env.get('ROUTING') == 'EP':
    defines.append('-DROUTING_EP=1')

libs = []
if env.get('WITH_TCP'):
    defines.append('-DTCP_ADAPTER=1')
    if env.get('SECURED') == '1':
        defines.append('-D__WITH_TLS__=1')

if env.get('SECURED') == '1':
    defines.append('-D__WITH_DTLS__=1')
    if env.get('EXC_PROV_SUPPORT') == '0':
        libs.append('-locpmapi')

pc_vars = {
    '\@VERSION\@': project_version,
    '\@PREFIX\@': user_prefix,
    '\@EXEC_PREFIX\@': user_prefix,
    '\@LIB_INSTALL_DIR\@': user_lib,
    '\@DEFINES\@': " ".join(defines),
    '\@LIBS\@': " ".join(libs)
}

env.Substfile(pc_file, SUBST_DICT = pc_vars)

######################################################################
# Setting global compiler flags
######################################################################
target_transport = env.get('TARGET_TRANSPORT')
with_mq = env.get('WITH_MQ')
with_ra = env.get('WITH_RA')
with_tcp = env.get('WITH_TCP')
rd_mode = env.get('RD_MODE')
with_ra_ibb = env.get('WITH_RA_IBB')

env.AppendUnique(LIBPATH = [env.get('BUILD_DIR')])

if (env.get('WITH_UPSTREAM_LIBCOAP') == '1'):
    env.AppendUnique(CPPDEFINES = ['WITH_UPSTREAM_LIBCOAP'])

if (target_os not in ['arduino', 'windows']):
    env.AppendUnique(CPPDEFINES = ['WITH_POSIX'])

if (target_os in ['darwin','ios']):
    env.AppendUnique(CPPDEFINES = ['_DARWIN_C_SOURCE'])

if (env.get('SECURED') == '1'):
    env.AppendUnique(CPPDEFINES = ['__WITH_DTLS__'])

if ((env.get('SECURED') == '1') and with_tcp):
    env.AppendUnique(CPPDEFINES = ['__WITH_TLS__'])

if (env.get('MULTIPLE_OWNER') == '1'):
    env.AppendUnique(CPPDEFINES=['MULTIPLE_OWNER'])

if (env.get('ROUTING') == 'GW'):
    env.AppendUnique(CPPDEFINES = ['ROUTING_GATEWAY'])
elif (env.get('ROUTING') == 'EP'):
    env.AppendUnique(CPPDEFINES = ['ROUTING_EP'])

if (target_os == 'arduino'):
    env.AppendUnique(CPPDEFINES = ['SINGLE_THREAD'])
    env.AppendUnique(CPPDEFINES = ['WITH_ARDUINO'])
elif (('IP' in target_transport) or ('ALL' in target_transport)):
        env.AppendUnique(CPPDEFINES = ['WITH_BWT'])

if (target_os in ['linux', 'tizen', 'android'] and with_tcp):
    env.AppendUnique(CPPDEFINES = ['WITH_TCP'])

if (target_os in ['linux', 'tizen', 'android', 'arduino', 'ios']):
    if (('BLE' in target_transport) or ('BT' in target_transport) or ('ALL' in target_transport)):
        env.AppendUnique(CPPDEFINES = ['WITH_TCP'])

if 'ALL' in target_transport:
    if with_ra:
        env.AppendUnique(CPPDEFINES = ['RA_ADAPTER'])
    if with_tcp:
        env.AppendUnique(CPPDEFINES = ['TCP_ADAPTER'])
    if (target_os in ['linux', 'yocto']):
        env.AppendUnique(CPPDEFINES = ['IP_ADAPTER', 'NO_EDR_ADAPTER', 'LE_ADAPTER'])
    elif (target_os == 'android'):
        env.AppendUnique(CPPDEFINES = ['IP_ADAPTER', 'EDR_ADAPTER', 'LE_ADAPTER', 'NFC_ADAPTER'])
    elif (target_os in['darwin', 'ios', 'msys_nt', 'windows']):
        env.AppendUnique(CPPDEFINES = ['IP_ADAPTER', 'NO_EDR_ADAPTER', 'NO_LE_ADAPTER'])
    else:
        env.AppendUnique(CPPDEFINES = ['IP_ADAPTER', 'EDR_ADAPTER', 'LE_ADAPTER'])
else:
    if ('BT' in target_transport):
        if (target_os == 'linux'):
            print "CA Transport BT is not supported "
            Exit(1)
        else:
            env.AppendUnique(CPPDEFINES = ['EDR_ADAPTER'])
    else:
        env.AppendUnique(CPPDEFINES = ['NO_EDR_ADAPTER'])

    if ('BLE' in target_transport):
        env.AppendUnique(CPPDEFINES = ['LE_ADAPTER'])
    else:
        env.AppendUnique(CPPDEFINES = ['NO_LE_ADAPTER'])

    if ('IP' in target_transport):
        env.AppendUnique(CPPDEFINES = ['IP_ADAPTER'])
    else:
        env.AppendUnique(CPPDEFINES = ['NO_IP_ADAPTER'])

    if with_tcp:
        if (target_os in ['linux', 'tizen', 'android', 'arduino', 'ios', 'windows']):
            env.AppendUnique(CPPDEFINES = ['TCP_ADAPTER', 'WITH_TCP'])
        else:
            print "CA Transport TCP is not supported "
            Exit(1)
    else:
        env.AppendUnique(CPPDEFINES = ['NO_TCP_ADAPTER'])

    if ('NFC' in target_transport):
        if (target_os == 'android'):
            env.AppendUnique(CPPDEFINES = ['NFC_ADAPTER'])
        else:
            print "CA Transport NFC is not supported "
            Exit(1)
    else:
        env.AppendUnique(CPPDEFINES = ['NO_NFC_ADAPTER'])

if ('SUB' in with_mq):
    env.AppendUnique(CPPDEFINES = ['MQ_SUBSCRIBER', 'WITH_MQ'])

if ('PUB' in with_mq):
    env.AppendUnique(CPPDEFINES = ['MQ_PUBLISHER', 'WITH_MQ'])

if ('BROKER' in with_mq):
    env.AppendUnique(CPPDEFINES = ['MQ_BROKER', 'WITH_MQ'])

if env.get('LOGGING'):
    env.AppendUnique(CPPDEFINES = ['TB_LOG'])

if env.get('WITH_CLOUD') and with_tcp:
    env.AppendUnique(CPPDEFINES = ['WITH_CLOUD'])

if 'CLIENT' in rd_mode:
    env.AppendUnique(CPPDEFINES = ['RD_CLIENT'])

if 'SERVER' in rd_mode:
    env.AppendUnique(CPPDEFINES = ['RD_SERVER'])

if with_ra_ibb:
    env.AppendUnique(CPPDEFINES = ['RA_ADAPTER_IBB'])

env.SConscript('external_builders.scons')

######################################################################
# Link scons to Yocto cross-toolchain ONLY when target_os is yocto
######################################################################
if target_os == "yocto":
    '''
    This code injects Yocto cross-compilation tools+flags into scons'
    build environment in order to invoke the relevant tools while
    performing a build.
    '''
    import os.path
    try:
        CC = os.environ['CC']
        target_prefix = CC.split()[0]
        target_prefix = target_prefix[:len(target_prefix)-3]
        tools = {"CC" : target_prefix+"gcc",
                "CXX" : target_prefix+"g++",
                "AS" : target_prefix+"as",
                "LD" : target_prefix+"ld",
                "GDB" : target_prefix+"gdb",
                "STRIP" : target_prefix+"strip",
                "RANLIB" : target_prefix+"ranlib",
                "OBJCOPY" : target_prefix+"objcopy",
                "OBJDUMP" : target_prefix+"objdump",
                "AR" : target_prefix+"ar",
                "NM" : target_prefix+"nm",
                "M4" : "m4",
                "STRINGS": target_prefix+"strings"}
        PATH = os.environ['PATH'].split(os.pathsep)
        for tool in tools:
            if tool in os.environ:
                for path in PATH:
                    if os.path.isfile(os.path.join(path, tools[tool])):
                        env[tool] = os.path.join(path, os.environ[tool])
                        break
        env['CROSS_COMPILE'] = target_prefix[:len(target_prefix) - 1]
    except:
        print "ERROR in Yocto cross-toolchain environment"
        Exit(1)
    '''
    Now reset TARGET_OS to linux so that all linux specific build configurations
    hereupon apply for the entirety of the build process.
    '''
    env['TARGET_OS'] = 'linux'
    '''
    We want to preserve debug symbols to allow BitBake to generate both DEBUG and
    RELEASE packages for OIC.
    '''
    env.AppendUnique(CCFLAGS = ['-g'])
    '''
    Additional flags to pass to the Yocto toolchain.
    '''
    if env.get('RELEASE'):
        env.AppendUnique(CPPDEFINES = ['NDEBUG'])
    env.AppendUnique(CPPDEFINES = ['__linux__', '_GNU_SOURCE'])
    env.AppendUnique(CFLAGS = ['-std=gnu99'])
    env.AppendUnique(CCFLAGS = ['-Wall', '-Wextra', '-fPIC'])
    env.AppendUnique(LIBS = ['dl', 'pthread', 'uuid'])
    Export('env')
else:
    '''
    If target_os is not Yocto, continue with the regular build process
    '''
    # Load config of target os
    env.SConscript(target_os + '/SConscript')

# Delete the temp files of configuration
if env.GetOption('clean'):
    dir = env.get('SRC_DIR')

    if os.path.exists(dir + '/config.log'):
        Execute(Delete(dir + '/config.log'))
    if os.path.exists(dir + '/.sconsign.dblite'):
        Execute(Delete(dir + '/.sconsign.dblite'))
    if os.path.exists(dir + '/.sconf_temp'):
        Execute(Delete(dir + '/.sconf_temp'))

######################################################################
# Check for PThreads support
######################################################################
import iotivityconfig
from iotivityconfig import *

conf = Configure(env,
        custom_tests =
        {
            'CheckPThreadsSupport' : iotivityconfig.check_pthreads
        } )

# Identify whether we have pthreads support, which is necessary for
# threading and mutexes.  This will set the environment variable
# POSIX_SUPPORTED, 1 if it is supported, 0 otherwise
conf.CheckPThreadsSupport()

env = conf.Finish()
######################################################################

# must call external_builders.scons second time to properly setup
# UnpackAll builder this is due to the system path not being pulled
# in for windows till after the windows target has run.
env.SConscript('external_builders.scons')
env.SConscript('external_libs.scons')
Return('env')