Fixing clang compilation and supporting clang-tidy

- clang.c includes necessary functions to make clang compiler work (tested on teensy 3.1)
- Added support code to generate a compile_commands.json for clang-tidy
  * Updates the symlink whenever cmake or make is called (Unix OSs only)

Lib/clang.c

@@ -0,0 +1,61 @@
+/* Copyright (C) 2016 by Jacob Alexander
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+
+// This file adds various functions that clang doesn't link properly
+// AFAIK, clang doesn't have an elegant solution for this, so this is what we gotta do...
+
+// ----- Includes -----
+
+// Compiler Includes
+#include <string.h>
+
+
+void __aeabi_memcpy( void *dest, const void *src, size_t n )
+{
+	(void)memcpy(dest, src, n);
+}
+
+void __aeabi_memcpy4( void *dest, const void *src, size_t n )
+{
+	memcpy(dest, src, n);
+}
+
+void __aeabi_memclr( void *dest, size_t n )
+{
+	memset(dest, 0, n);
+}
+
+void __aeabi_memclr4( void *dest, size_t n )
+{
+	memset(dest, 0, n);
+}
+
+void __aeabi_memmove( void *dest, const void *src, size_t n )
+{
+	(void)memmove(dest, src, n);
+}
+
+void __aeabi_memset( void *s, size_t n, int c )
+{
+	(void)memset(s, c, n);
+}
+