1 files changed, 70 insertions, 0 deletions
diff --git a/genconfig.py b/genconfig.py
new file mode 100755
index 0000000..f0412ba
--- /dev/null
+++ b/genconfig.py
@@ -0,0 +1,70 @@
+#!/usr/bin/env python
+
+# Generates a C header from the configuration, matching the format generated by
+# 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 sys
+
+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()