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diff --git a/prism/compiler/unused.h b/prism/compiler/unused.h
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+/**
+ * @file compiler/unused.h
+ */
+#ifndef PRISM_COMPILER_UNUSED_H
+#define PRISM_COMPILER_UNUSED_H
+
+/**
+ * GCC will warn if you specify a function or parameter that is unused at
+ * runtime. This macro allows you to mark a function or parameter as unused in a
+ * compiler-agnostic way.
+ */
+#if defined(__GNUC__)
+# define PRISM_UNUSED __attribute__((unused))
+#else
+# define PRISM_UNUSED
+#endif
+
+#endif