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# This script functions similarly to scripts/kconfig/merge_config.sh from the
# kernel tree, merging multiple configurations fragments to produce a complete
# .config, with unspecified values filled in as for alldefconfig.
#
# The generated .config respects symbol dependencies, and a warning is printed
# if any symbol gets a different value from the assigned value.
#
# For a real-world merging example based on this script, see
# https://github.com/zephyrproject-rtos/zephyr/blob/master/scripts/kconfig/kconfig.py.
#
# Here's a demo:
#
# Kconfig contents:
#
# config FOO
# bool "FOO"
#
# config BAR
# bool "BAR"
#
# config BAZ
# string "BAZ"
#
# config QAZ
# bool "QAZ" if n
#
#
# conf1 contents:
#
# CONFIG_FOO=y
#
#
# conf2 contents:
#
# CONFIG_BAR=y
#
#
# conf3 contents:
#
# # Ops... assigned twice
# # CONFIG_FOO is not set
#
# # Ops... this symbol doesn't exist
# CONFIG_OPS=y
#
# CONFIG_BAZ="baz string"
#
#
# conf4 contents:
#
# CONFIG_QAZ=y
#
#
# Running:
#
# $ python(3) merge_config.py Kconfig merged conf1 conf2 conf3 conf4
# conf3:2: warning: FOO (defined at Kconfig:1) set more than once. Old value: "y", new value: "n".
# conf3:5: warning: attempt to assign the value "y" to the undefined symbol OPS
# warning: QAZ (defined at Kconfig:10) was assigned the value "y" but got the value "n" -- check dependencies
# $ cat merged
# Generated by Kconfiglib (https://github.com/ulfalizer/Kconfiglib)
# # CONFIG_FOO is not set
# CONFIG_BAR=y
# CONFIG_BAZ="baz string"
import sys
from kconfiglib import Kconfig, BOOL, TRISTATE, TRI_TO_STR
if len(sys.argv) < 4:
sys.exit("usage: merge_config.py Kconfig merged_config config1 [config2 ...]")
kconf = Kconfig(sys.argv[1])
# Enable warnings for assignments to undefined symbols
kconf.enable_undef_warnings()
# (This script uses alldefconfig as the base. Other starting states could be
# set up here as well. The approach in examples/allnoconfig_simpler.py could
# provide an allnoconfig starting state for example.)
# Disable warnings generated for multiple assignments to the same symbol within
# a (set of) configuration files. Assigning a symbol multiple times might be
# done intentionally when merging configuration files.
kconf.disable_override_warnings()
kconf.disable_redun_warnings()
# Create a merged configuration by loading the fragments with replace=False
for config in sys.argv[3:]:
kconf.load_config(config, replace=False)
# Write the merged configuration
kconf.write_config(sys.argv[2])
# Print warnings for symbols whose actual value doesn't match the assigned
# value
def name_and_loc(sym):
# Helper for printing symbol names and Kconfig file location(s) in warnings
if not sym.nodes:
return sym.name + " (undefined)"
return "{} (defined at {})".format(
sym.name,
", ".join("{}:{}".format(node.filename, node.linenr)
for node in sym.nodes))
for sym in kconf.defined_syms:
# Was the symbol assigned to?
if sym.user_value is not None:
# Tristate values are represented as 0, 1, 2. Having them as
# "n", "m", "y" is more convenient here, so convert.
if sym.type in (BOOL, TRISTATE):
user_value = TRI_TO_STR[sym.user_value]
else:
user_value = sym.user_value
if user_value != sym.str_value:
print("warning: {} was assigned the value '{}' but got the "
"value '{}' -- check dependencies"
.format(name_and_loc(sym), user_value, sym.str_value))
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