From 4cc7fa5c4c5c397611b80896b265ec8187a7aa73 Mon Sep 17 00:00:00 2001
From: Gunar Schorcht <gunar@schorcht.net>
Date: Mon, 21 Oct 2019 01:27:33 +0200
Subject: [PATCH] sys/arduino: Wire requires periph_i2c module

---
 sys/Makefile.dep           | 4 ++++
 sys/arduino/include/Wire.h | 4 ++++
 sys/arduino/wireport.cpp   | 8 ++++++++
 3 files changed, 16 insertions(+)

diff --git a/sys/Makefile.dep b/sys/Makefile.dep
index 10a9375146f4e..4b40c3a632da1 100644
--- a/sys/Makefile.dep
+++ b/sys/Makefile.dep
@@ -1,3 +1,7 @@
+ifneq (,$(filter arduino,$(USEMODULE)))
+  FEATURES_OPTIONAL += periph_i2c
+endif
+
 ifneq (,$(filter eepreg,$(USEMODULE)))
   FEATURES_REQUIRED += periph_eeprom
 endif
diff --git a/sys/arduino/include/Wire.h b/sys/arduino/include/Wire.h
index 9d9f91113ba0a..0f546e86613d3 100644
--- a/sys/arduino/include/Wire.h
+++ b/sys/arduino/include/Wire.h
@@ -17,6 +17,10 @@
 #ifndef WIRE_H
 #define WIRE_H
 
+#ifndef MODULE_PERIPH_I2C
+#error "No I2C support on your board"
+#endif
+
 #ifdef __cplusplus
 #include "wireport.hpp"
 #endif
diff --git a/sys/arduino/wireport.cpp b/sys/arduino/wireport.cpp
index 296d19a4c8c72..85fa75fc86258 100644
--- a/sys/arduino/wireport.cpp
+++ b/sys/arduino/wireport.cpp
@@ -52,6 +52,8 @@
  * (https://creativecommons.org/licenses/by-sa/3.0/).
  */
 
+#if MODULE_PERIPH_I2C
+
 extern "C" {
 #include <stdlib.h>
 #include <string.h>
@@ -269,3 +271,9 @@ void TwoWire::flush(void)
 /* single instance */
 
 TwoWire Wire;
+
+#else /* MODULE_PERIPH_I2C */
+
+typedef int dont_be_pedantic;
+
+#endif /* MODULE_PERIPH_I2C */