tests: add test for cpp files exclude

tests/cpp_exclude/module_exclude/Makefile

@@ -0,0 +1,5 @@
+MODULE = module_exclude
+
+SRCXXEXCLUDE := module_excluded.cpp
+
+include $(RIOTBASE)/Makefile.base

tests/cpp_exclude/module_exclude/Makefile.dep

@@ -0,0 +1 @@
+FEATURES_REQUIRED += cpp

tests/cpp_exclude/module_exclude/Makefile.include

@@ -0,0 +1,3 @@
+# Use an immediate variable to evaluate `MAKEFILE_LIST` now
+USEMODULE_INCLUDES_module_exclude := $(abspath $(dir $(lastword $(MAKEFILE_LIST))))
+USEMODULE_INCLUDES += $(USEMODULE_INCLUDES_module_exclude)

tests/cpp_exclude/module_exclude/module.cpp

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2019 Inria
+ *
+ * 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.
+ */
+
+/**
+ * @ingroup     tests
+ * @{
+ *
+ * @file
+ * @brief       Sample module C++ class
+ *
+ * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
+ *
+ * @}
+ */
+
+#include <cstdio>
+
+#include "module.hpp"
+
+module_class::module_class() {}
+
+module_class::~module_class() {}
+
+void module_class::print_hello(void)
+{
+    puts("Hello from C++ module");
+}

tests/cpp_exclude/module_exclude/module.hpp

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2019 Inria
+ *
+ * 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.
+ */
+
+/**
+ * @ingroup     tests
+ * @{
+ *
+ * @file
+ * @brief       Sample module C++ class
+ *
+ * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
+ *
+ * @}
+ */
+
+#ifndef MODULE_H
+#define MODULE_H
+
+#include <cstdio>
+
+class module_class
+{
+public:
+    /**
+     * @brief constructor
+     */
+    module_class();
+
+    /**
+     * @brief destructor
+     */
+    ~module_class();
+
+    /**
+     * @brief public function
+     */
+    void print_hello(void);
+};
+
+/** @} */
+#endif /* MODULE_H */

tests/cpp_exclude/module_exclude/module_excluded.cpp

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2019 Inria
+ *
+ * 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.
+ */
+
+/**
+ * @ingroup     tests
+ * @{
+ *
+ * @file
+ * @brief       Sample module C++ class
+ *
+ * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
+ *
+ * @}
+ */
+
+#include <cstdio>
+
+#include "module.hpp"
+
+#error "This should not be built"
+
+module_class::module_class() {}
+
+module_class::~module_class() {}
+
+void module_class::print(void)
+{
+    puts("Hello from C++ module");
+}