Jerry is now split to several components: core, libc, plugins.

The components are build independently and then are linked with main module corresponding to target platform.
Core is supposed to be platform-independent, while libc and plugins are dependent on specific architecture / platform.

The commit disables unit tests building and running during precommit.
That is supposed to be fixed in a subsequent commit.

Also, the commit disables building and running valgrind targets during precommit.
Build is supposed to be turned on by an option that should be introduced later.
Valgrind-checked runs are supposed to be performed in asynchronous mode.

jerry-libc/target/mcu-stubs/jerry-libc-target.c

@@ -0,0 +1,54 @@
+/* Copyright 2015 Samsung Electronics Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Jerry libc platform-specific functions stm32f4 implementation
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "jerry-libc-defs.h"
+
+/** Output of character. Writes the character c, cast to an unsigned char, to stdout.  */
+int
+putchar (int c __attr_unused___)
+{
+  return 1;
+} /* putchar */
+
+/** exit - cause normal process termination  */
+void __attr_noreturn___ __attr_used___
+exit (int status __attr_unused___)
+{
+  while (true)
+  {
+  }
+} /* exit */
+
+/**
+ * fwrite
+ *
+ * @return number of bytes written
+ */
+size_t
+fwrite (const void *ptr __attr_unused___, /**< data to write */
+        size_t size, /**< size of elements to write */
+        size_t nmemb, /**< number of elements */
+        FILE *stream __attr_unused___) /**< stream pointer */
+{
+  return size * nmemb;
+} /* fwrite */
+