def getRoot(config):
    if not config.parent:
        return config
    return getRoot(config.parent)


root = getRoot(config)

if root.host_os in ["Windows"]:
    config.unsupported = True

# AIX usually usually makes use of an explicit export list when linking a shared
# object, since the linker doesn't export anything by default.
if root.host_os in ["AIX"]:
    config.substitutions.append(("%shared_linker_xopts", "-Wl,-bE:shr.exp"))
else:
    config.substitutions.append(("%shared_linker_xopts", ""))