# define fallthrough do {} while (0) /* fallthrough */
#endif
+/*
+ * gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#Common-Function-Attributes
+ * clang: https://clang.llvm.org/docs/AttributeReference.html#flatten
+ */
+# define __flatten __attribute__((flatten))
+
/*
* Note the missing underscores.
*