br.h: add __unused and __used macros

2022/day09/aoc-c.c

@@ -186,28 +186,6 @@ static int parse()
     return count;
 }
 
-/*
- * static int solve(int part)
- * {
- *     ulong bucket;
- *     dir_t *cur;
- *     int res = 0, needed;
- *
- *     if (part == 1) {
- *         hash_for_each(hasht_dir, bucket, cur, hlist)
- *             if (cur->size <= 100000)
- *                 res += cur->size;
- *     } else {
- *         res = find_dirname("/", 1)->size;
- *         needed = res - (70000000-30000000);
- *         hash_for_each(hasht_dir, bucket, cur, hlist)
- *             if (cur->size >= needed && cur->size < res)
- *                 res = cur->size;
- *     }
- *     return res;
- * }
- */
-
 int main(int ac, char **av)
 {
     int part = parseargs(ac, av);

2022/include/br.h

@@ -31,6 +31,17 @@
 #define __PASTE(x, y)       ___PASTE(x, y)
 #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
 
+/* unused/used parameters/functions
+ * https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-unused-function-attribute
+ * https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.html#index-unused-type-attribute
+ * https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-unused-variable-attribute
+ * https://gcc.gnu.org/onlinedocs/gcc/Label-Attributes.html#index-unused-label-attribute
+ * https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-used-function-attribute
+ * https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-used-variable-attribute
+ */
+#define __unused             __attribute__((__unused__))
+#define __used               __attribute__((__used__))
+
 /* see https://lkml.org/lkml/2018/3/20/845 for explanation of this monster
  */
 #define __is_constexpr(x) \