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# ---------------------------------------------------------------------------------------------------------------------
# SPDX-License-Identifier: MIT
# ---------------------------------------------------------------------------------------------------------------------
# This class eases conditional additions to OVERRIDES, which makes it easier
# to create yocto-compatible layers. This is similar to distrooverrides.bbclass,
# but is more generic.
#
# Example usage, in conf/layer.conf:
#
# INHERIT:append = " feature_overrides"
# FEATUREOVERRIDES .= "${@bb.utils.contains('DISTRO_FEATURES', 'some-feature', ':feature-some-feature', '', d)}"
# FEATUREOVERRIDES .= "${@bb.utils.contains('MACHINE_FEATURES', 'some-bsp-feature', ':feature-some-bsp-feature', '', d)}"
python add_feature_overrides () {
feature_overrides = filter(None, d.getVar('FEATUREOVERRIDES').split(':'))
if feature_overrides:
d.prependVar('OVERRIDES', ':'.join(unique_everseen(feature_overrides)) + ':')
}
add_feature_overrides[eventmask] = "bb.event.ConfigParsed"
addhandler add_feature_overrides
def unique_everseen(iterable):
"List unique elements, preserving order. Remember all elements ever seen."
# unique_everseen('AAAABBBCCDAABBB') --> A B C D
# unique_everseen('ABBCcAD', str.lower) --> A B C D
import itertools
seen = set()
seen_add = seen.add
for element in itertools.filterfalse(seen.__contains__, iterable):
seen_add(element)
yield element
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