def meson_do_qa_configure(d):
    import re
    warn_re = re.compile(r"^WARNING: Cross property (.+) is using default value (.+)$", re.MULTILINE)
    with open(d.expand("${B}/meson-logs/meson-log.txt")) as logfile:
        log = logfile.read()
    for (prop, value) in warn_re.findall(log):
        bb.warn("Meson cross property %s used without explicit assignment, defaulting to %s" % (prop, value))

meson_do_qa_configure(d)