From de8108648f487c284a10d66f8e16475790f01876 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Br=C3=A1zio?= <jbrazio@gmail.com>
Date: Fri, 22 Apr 2016 17:33:00 +0100
Subject: [PATCH] Added a versioning system to the config files

---
 Marlin/Configuration.h     | 13 +++++++++++++
 Marlin/Configuration_adv.h | 13 +++++++++++++
 Marlin/SanityCheck.h       | 14 ++++++++++++++
 Marlin/Version.h           | 10 ++++++++++
 4 files changed, 50 insertions(+)

diff --git a/Marlin/Configuration.h b/Marlin/Configuration.h
index 502690ada..1c34d5976 100644
--- a/Marlin/Configuration.h
+++ b/Marlin/Configuration.h
@@ -38,6 +38,19 @@
 #ifndef CONFIGURATION_H
 #define CONFIGURATION_H
 
+/**
+ *
+ *  ***********************************
+ *  **  ATTENTION TO ALL DEVELOPERS  **
+ *  ***********************************
+ *
+ * You must increment this version number for every significant change such as,
+ * but not limited to: ADD, DELETE RENAME OR REPURPOSE any directive/option.
+ *
+ * Note: Update also Default_Version.h !
+ */
+#define CONFIGURATION_H_VERSION 1
+
 #include "boards.h"
 #include "macros.h"
 
diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h
index 952da0fa7..328df8eef 100644
--- a/Marlin/Configuration_adv.h
+++ b/Marlin/Configuration_adv.h
@@ -33,6 +33,19 @@
 #ifndef CONFIGURATION_ADV_H
 #define CONFIGURATION_ADV_H
 
+/**
+ *
+ *  ***********************************
+ *  **  ATTENTION TO ALL DEVELOPERS  **
+ *  ***********************************
+ *
+ * You must increment this version number for every significant change such as,
+ * but not limited to: ADD, DELETE RENAME OR REPURPOSE any directive/option.
+ *
+ * Note: Update also Default_Version.h !
+ */
+#define CONFIGURATION_ADV_H_VERSION 1
+
 #include "Conditionals.h"
 
 // @section temperature
diff --git a/Marlin/SanityCheck.h b/Marlin/SanityCheck.h
index a913cb1b0..8d90554e5 100644
--- a/Marlin/SanityCheck.h
+++ b/Marlin/SanityCheck.h
@@ -38,6 +38,20 @@
   #error "Versions of Arduino IDE prior to 1.6.0 are no longer supported, please update your toolkit."
 #endif
 
+/**
+ * We try our best to include sanity checks for all the changes configuration
+ * directives because people have a tendency to use outdated config files with
+ * the bleding edge source code, but sometimes this is not enough. This check
+ * will force a minimum config file revision, otherwise Marlin will not build.
+ */
+#if ! defined(CONFIGURATION_H_VERSION) || CONFIGURATION_H_VERSION < REQUIRED_CONFIGURATION_H_VERSION
+  #error You are using an old Configuration.h file, updated it before building Marlin.
+#endif
+
+#if ! defined(CONFIGURATION_ADV_H_VERSION) || CONFIGURATION_ADV_H_VERSION < REQUIRED_CONFIGURATION_ADV_H_VERSION
+  #error You are using an old Configuration_adv.h file, updated it before building Marlin.
+#endif
+
 /**
  * Marlin release, version and default string
  */
diff --git a/Marlin/Version.h b/Marlin/Version.h
index 68f3f7604..edf1a9999 100644
--- a/Marlin/Version.h
+++ b/Marlin/Version.h
@@ -44,6 +44,16 @@
  */
 #define STRING_DISTRIBUTION_DATE "2016-04-27 12:00"
 
+/**
+ * Required minimum Configuration.h and Configuration_adv.h file versions.
+ *
+ * You must increment this version number for every significant change such as,
+ * but not limited to: ADD, DELETE RENAME OR REPURPOSE any directive/option on
+ * the configuration files.
+ */
+#define REQUIRED_CONFIGURATION_H_VERSION 1
+#define REQUIRED_CONFIGURATION_ADV_H_VERSION 1
+
 /**
  * @todo: Missing documentation block
  */