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#!/usr/bin/env python
# Copyright (c) 2018, 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]] [KCONFIG_FILENAME]
import argparse
import kconfiglib
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.
"""
DEFAULT_HEADER_PATH = "config.h"
DEFAULT_SYNC_DEPS_PATH = "deps/"
def main():
parser = argparse.ArgumentParser(description=DESCRIPTION)
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="?",
default=None,
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(
"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(kconfiglib.standard_config_filename())
kconf.write_autoconf(args.header_path)
if args.sync_deps_path is not None:
kconf.sync_deps(args.sync_deps_path)
if __name__ == "__main__":
main()
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