ccan/compiler: attribute nonnull support

contrib/ccan/compiler/compiler.h

@@ -228,4 +228,16 @@
 #define WARN_UNUSED_RESULT
 #endif
 #endif
+
+#ifndef NON_NULL
+#if HAVE_ATTRIBUTE_NONNULL
+/**
+ * NON_NULL - nonnull attribute specifies that some function parameters should be non-null pointers.
+ */
+#define NON_NULL(...) __attribute__((nonnull(__VA_ARGS__)))
+#else
+#define NON_NULL(...)
+#endif
+#endif
+
 #endif /* CCAN_COMPILER_H */

contrib/config.h

@@ -2,4 +2,5 @@
 #define HAVE_ATTRIBUTE_COLD 1
 #define HAVE_ATTRIBUTE_NORETURN 1
 #define HAVE_ATTRIBUTE_PURE 1
-#define HAVE_ATTRIBUTE_UNUSED 1
\ No newline at end of file
+#define HAVE_ATTRIBUTE_UNUSED 1
+#define HAVE_ATTRIBUTE_NONNULL 1
\ No newline at end of file