Avoid barfing on gcc's implicit memcpy()s

src/core/gcc_implicit.c

@@ -0,0 +1,20 @@
+/** @file
+ *
+ * gcc implicit functions
+ *
+ * gcc sometimes likes to insert implicit calls to memcpy().
+ * Unfortunately, there doesn't seem to be any way to prevent it from
+ * doing this, or to force it to use the optimised memcpy() as seen by
+ * C code; it insists on inserting a symbol reference to "memcpy".  We
+ * therefore include wrapper functions just to keep gcc happy.
+ *
+ */
+
+#include <string.h>
+
+void * gcc_implicit_memcpy ( void *dest, const void *src,
+			     size_t len ) asm ( "memcpy" );
+
+void * gcc_implicit_memcpy ( void *dest, const void *src, size_t len ) {
+	return memcpy ( dest, src, len );
+}