Fixup RBS_ATTRIBUTE_UNUSED macro

Author: soutaro

include/rbs/defines.h

@@ -74,4 +74,13 @@
 #define NODISCARD __attribute__((warn_unused_result))
 #endif
 
+/**
+ * Mark a function or variable as potentially unused to suppress compiler warnings.
+ */
+#if defined(__GNUC__) || defined(__clang__)
+#define RBS_ATTRIBUTE_UNUSED __attribute__((unused))
+#else
+#define RBS_ATTRIBUTE_UNUSED
+#endif
+
 #endif

include/rbs/util/rbs_encoding.h

@@ -6,6 +6,8 @@
 #ifndef RBS_RBS_ENCODING_H
 #define RBS_RBS_ENCODING_H
 
+#include "rbs/defines.h"
+
 #include <assert.h>
 #include <stdbool.h>
 #include <stddef.h>

src/util/rbs_constant_pool.c

@@ -37,7 +37,7 @@ next_power_of_two(uint32_t v) {
     return v;
 }
 
-__attribute__((unused)) static bool is_power_of_two(uint32_t size) {
+RBS_ATTRIBUTE_UNUSED static bool is_power_of_two(uint32_t size) {
     return (size & (size - 1)) == 0;
 }
 

src/util/rbs_encoding.c

@@ -3,12 +3,6 @@
 
 #include <ctype.h>
 
-#if defined(__GNUC__)
-#define RBS_ATTRIBUTE_UNUSED __attribute__((unused))
-#else
-#define RBS_ATTRIBUTE_UNUSED
-#endif
-
 typedef uint32_t rbs_unicode_codepoint_t;
 
 #define UNICODE_ALPHA_CODEPOINTS_LENGTH 1450