Add syncconfig.py, used for incremental builds

This script calls through to Kconfiglib.sync_deps() and can be used to
implement incremental builds.

Having additional dependency mechanisms for changes to Kconfig files and
environment variables is redundant, because those changes indirectly
influence symbol values and will be caught as well.

1 files changed, 37 insertions, 0 deletions

diff --git a/syncconfig.py b/syncconfig.py
new file mode 100755
index 0000000..7a97d01
--- /dev/null
+++ b/syncconfig.py
@@ -0,0 +1,37 @@
+#!/usr/bin/env python
+
+# This script can be used to implement incremental builds, where changing a
+# symbol will recompile just the source files that reference it.
+#
+# See the docstring for the Kconfig.sync_deps() function for more usage
+# information.
+#
+# Usage:
+#
+#   (Automatically) run the following command before each build:
+#
+#     $ syncconfig [<top Kconfig file>] <symbol file directory, passed to sync_deps()>
+#
+#   This will indirectly catch any (relevant) changes to Kconfig files and
+#   environment variables as well, so it's redundant to have separate
+#   dependencies for those (except as a slight optimization).
+
+import sys
+
+import kconfiglib
+
+def main():
+    if not 2 <= len(sys.argv) <= 3:
+        sys.exit("usage: {} [Kconfig] <Symbol directory>".format(sys.argv[0]))
+
+    if len(sys.argv) == 2:
+        kconfig_filename = "Kconfig"
+        sym_dir = sys.argv[1]
+    else:
+        kconfig_filename = sys.argv[1]
+        sym_dir = sys.argv[2]
+
+    kconfiglib.Kconfig(kconfig_filename).sync_deps(sym_dir)
+
+if __name__ == "__main__":
+    main()