def do_multilib_install(d):
    import re

    multilibs = d.getVar('MULTILIB_VARIANTS')
    if not multilibs or bb.data.inherits_class('nativesdk', d):
        return

    binv = d.getVar('BINV')

    mlprefix = d.getVar('MLPREFIX')
    if ('%slibgcc' % mlprefix) != d.getVar('PN'):
        return

    if mlprefix:
        orig_tune = d.getVar('DEFAULTTUNE_MULTILIB_ORIGINAL')
        orig_tune_params = get_tune_parameters(orig_tune, d)
        orig_tune_baselib = orig_tune_params['baselib']
        orig_tune_bitness = orig_tune_baselib.replace('lib', '')
        if not orig_tune_bitness:
            orig_tune_bitness = '32'

        src = '../../../' + orig_tune_baselib + '/' + \
            d.getVar('TARGET_SYS_MULTILIB_ORIGINAL') + '/' + binv + '/'

        dest = d.getVar('D') + d.getVar('libdir') + '/' + \
            d.getVar('TARGET_SYS') + '/' + binv + '/' + orig_tune_bitness

        if os.path.lexists(dest):
            os.unlink(dest)
        os.symlink(src, dest)
        return


    for ml in multilibs.split():
        tune = d.getVar('DEFAULTTUNE:virtclass-multilib-' + ml)
        if not tune:
            bb.warn('DEFAULTTUNE:virtclass-multilib-%s is not defined. Skipping...' % ml)
            continue

        tune_parameters = get_tune_parameters(tune, d)
        tune_baselib = tune_parameters['baselib']
        if not tune_baselib:
            bb.warn("Tune %s doesn't have a baselib set. Skipping..." % tune)
            continue

        tune_arch = tune_parameters['arch']
        tune_bitness = tune_baselib.replace('lib', '')
        if not tune_bitness:
            tune_bitness = '32' # /lib => 32bit lib

        tune_abiextension = tune_parameters['abiextension']
        if tune_abiextension:
            libcextension = '-gnu' + tune_abiextension
        else:
            libcextension = ''

        src = '../../../' + tune_baselib + '/' + \
            tune_arch + d.getVar('TARGET_VENDOR') + 'ml' + ml + \
            '-' + d.getVar('TARGET_OS') + libcextension +  '/' + binv + '/'

        dest = d.getVar('D') + d.getVar('libdir') + '/' + \
            d.getVar('TARGET_SYS') + '/' + binv + '/' + tune_bitness

        if os.path.lexists(dest):
            os.unlink(dest)
        os.symlink(src, dest)

do_multilib_install(d)

def get_tune_parameters(tune, d):
    availtunes = d.getVar('AVAILTUNES')
    if tune not in availtunes.split():
        bb.error('The tune: %s is not one of the available tunes: %s' % (tune or None, availtunes))

    localdata = bb.data.createCopy(d)
    override = ':tune-' + tune
    localdata.setVar('OVERRIDES', localdata.getVar('OVERRIDES', False) + override)

    retdict = {}
    retdict['tune'] = tune
    retdict['ccargs'] = localdata.getVar('TUNE_CCARGS')
    retdict['features'] = localdata.getVar('TUNE_FEATURES')
    # BASELIB is used by the multilib code to change library paths
    retdict['baselib'] = localdata.getVar('BASE_LIB') or localdata.getVar('BASELIB')
    retdict['arch'] = localdata.getVar('TUNE_ARCH')
    retdict['abiextension'] = localdata.getVar('ABIEXTENSION')
    retdict['target_fpu'] = localdata.getVar('TARGET_FPU')
    retdict['pkgarch'] = localdata.getVar('TUNE_PKGARCH')
    retdict['package_extra_archs'] = localdata.getVar('PACKAGE_EXTRA_ARCHS')
    return retdict