Makefile: Give a build error if ad-hoc CONFIG options are added
New CONFIG options should be added via Kconfig. To help prevent new ad-hoc
CONFIGs from being added, give a build error when these are detected.
Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
diff --git a/scripts/check-config.sh b/scripts/check-config.sh
new file mode 100755
index 0000000..28c8fe9
--- /dev/null
+++ b/scripts/check-config.sh
@@ -0,0 +1,55 @@
+#!/bin/sh
+# Copyright (c) 2016 Google, Inc
+# Written by Simon Glass <sjg@chromium.org>
+#
+# Check that the u-boot.cfg file provided does not introduce any new
+# ad-hoc CONFIG options
+#
+# You can generate the list of current ad-hoc CONFIG options (those which are
+# not in Kconfig) with this command:
+#
+# export LC_ALL=C LC_COLLATE=C
+# git grep CONFIG_ |tr ' \t' '\n\n' |sed -n 's/^\(CONFIG_[A-Z0-9_]*\).*/\1/p' \
+# |sort |uniq >scripts/config_whitelist.txt;
+# unset LC_ALL LC_COLLATE
+
+# Usage
+# check-config.sh <path to u-boot.cfg> <path to whitelist file> <source dir>
+#
+# For example:
+# scripts/check-config.sh b/chromebook_link/u-boot.cfg kconfig_whitelist.txt .
+
+path="$1"
+whitelist="$2"
+srctree="$3"
+
+# Temporary files
+configs="${path}.configs"
+suspects="${path}.suspects"
+ok="${path}.ok"
+new_adhoc="${path}.adhoc"
+
+export LC_ALL=C
+export LC_COLLATE=C
+
+cat ${path} |sed -n 's/^#define \(CONFIG_[A-Za-z0-9_]*\).*/\1/p' |sort |uniq \
+ >${configs}
+
+comm -23 ${configs} ${whitelist} > ${suspects}
+
+cat `find ${srctree} -name "Kconfig*"` |sed -n \
+ -e 's/^config *\([A-Za-z0-9_]*\).*$/CONFIG_\1/p' \
+ -e 's/^menuconfig \([A-Za-z0-9_]*\).*$/CONFIG_\1/p' |sort |uniq > ${ok}
+comm -23 ${suspects} ${ok} >${new_adhoc}
+if [ -s ${new_adhoc} ]; then
+ echo "Error: You must add new CONFIG options using Kconfig"
+ echo "The following new ad-hoc CONFIG options were detected:"
+ cat ${new_adhoc}
+ echo
+ echo "Please add these via Kconfig instead. Find a suitable Kconfig"
+ echo "file and add a 'config' or 'menuconfig' option."
+ # Don't delete the temporary files in case they are useful
+ exit 1
+else
+ rm ${suspects} ${ok} ${new_adhoc}
+fi