Add compiler Attributes header file

src/Attributes.hh

@@ -0,0 +1,17 @@
+/* Attributes.hh
+ * vim: set tw=80:
+ * Eryn Wells <eryn@erynwells.me>
+ */
+/**
+ * Defines for common compiler attributes.
+ *
+ * See https://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html for GCC
+ * attributes.
+ */
+
+#ifndef __ATTRIBUTES_HH__
+#define __ATTRIBUTES_HH__
+
+#define PACKED __attribute__((packed))
+
+#endif /* __ATTRIBUTES_HH__ */