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#!/usr/bin/env python
# Copyright (c) 2018-2019, Ulf Magnusson
# SPDX-License-Identifier: ISC
# Generates a C header from the configuration, matching the format of
# include/generated/autoconf.h in the kernel.
#
# Optionally generates a directory structure with one file per symbol that can
# be used to implement incremental builds. See the docstring for
# Kconfig.sync_deps() in Kconfiglib.
#
# Usage (see argument help texts for more information):
#
# genconfig.py [-h] [--header-path HEADER_FILE]
# [--sync-deps [OUTPUT_DIR]] [--config-out CONFIG_FILE]
# [KCONFIG_FILENAME]
import argparse
import kconfiglib
DEFAULT_HEADER_PATH = "config.h"
DEFAULT_SYNC_DEPS_PATH = "deps/"
def main():
parser = argparse.ArgumentParser(description="""
Generates a header file with defines from the configuration. Optionally
creates/updates a directory with incremental build information as well (see the
docstring for the Kconfig.sync_deps() function in Kconfiglib). The .config file
to generate the configuration from can be specified by setting the
KCONFIG_CONFIG environment variable.""")
parser.add_argument(
"--header-path",
metavar="HEADER_FILE",
default=DEFAULT_HEADER_PATH,
help="Path for the generated header file (default: {})"
.format(DEFAULT_HEADER_PATH))
parser.add_argument(
"--sync-deps",
dest="sync_deps_path",
metavar="OUTPUT_DIR",
nargs="?",
const=DEFAULT_SYNC_DEPS_PATH,
help="Enable generation of build dependency information for "
"incremental builds, optionally specifying the output path "
"(default: {})".format(DEFAULT_SYNC_DEPS_PATH))
parser.add_argument(
"--config-out",
dest="config_path",
metavar="CONFIG_FILE",
help="Write the configuration to the specified filename. "
"This is useful if you include .config files in Makefiles, as "
"the generated configuration file will be a full .config file "
"even if .config is outdated. The generated configuration "
"matches what olddefconfig would produce. If you use "
"--sync-deps, you can include deps/auto.conf instead. "
"--config-out is meant for cases where incremental build "
"information isn't needed.")
parser.add_argument(
"kconfig_filename",
metavar="KCONFIG_FILENAME",
nargs="?",
default="Kconfig",
help="Top-level Kconfig file (default: Kconfig)")
args = parser.parse_args()
kconf = kconfiglib.Kconfig(args.kconfig_filename)
kconf.load_config(verbose=False)
kconf.write_autoconf(args.header_path)
if args.sync_deps_path is not None:
kconf.sync_deps(args.sync_deps_path)
if args.config_path is not None:
kconf.write_config(args.config_path, save_old=False)
if __name__ == "__main__":
main()
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