+
+/**
+ * stringify - Turn expression into a string literal
+ * @expr: any C expression
+ *
+ * Example:
+ * #define PRINT_COND_IF_FALSE(cond) \
+ * ((cond) || printf("%s is false!", stringify(cond)))
+ */
+#define stringify(expr) stringify_1(expr)
+/* Double-indirection required to stringify expansions */
+#define stringify_1(expr) #expr