sys/preprocessor: add Kconfig file

sys/Kconfig

@@ -85,6 +85,7 @@ rsource "oneway-malloc/Kconfig"
 rsource "phydat/Kconfig"
 rsource "pm_layered/Kconfig"
 rsource "posix/Kconfig"
+rsource "preprocessor/Kconfig"
 rsource "progress_bar/Kconfig"
 rsource "ps/Kconfig"
 rsource "random/Kconfig"

sys/auto_init/Kconfig

@@ -9,6 +9,7 @@ menuconfig MODULE_AUTO_INIT
     bool "Auto-initialization system"
     default y
     depends on TEST_KCONFIG
+    select MODULE_PREPROCESSOR_SUCCESSOR
     help
         Auto-initialization module. Can be used to initialize modules (such as
         drivers, or network interfaces) on start-up automatically. Disable if a

sys/preprocessor/Kconfig

@@ -0,0 +1,15 @@
+# Copyright (c) 2022 Otto-von-Guericke-Universität Magdeburg
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+#
+
+config MODULE_PREPROCESSOR
+    bool "Preprocessor utilities"
+    depends on TEST_KCONFIG
+
+config MODULE_PREPROCESSOR_SUCCESSOR
+    bool "Generate preprocessor_successor.h to do preprocessor based successor arithmetic"
+    depends on TEST_KCONFIG
+    select MODULE_PREPROCESSOR