infra: define ATTRIBUTE_NONNULL to mark non-NULL parameters

* src/internal.h (ATTRIBUTE_NONNULL): Define.

diff --git a/src/internal.h b/src/internal.h
index 936cd030207e28b79f38ae943241316d68f2ddc0..8fa579cb338c6657ce06b731d3fcb79582bd5ba2 100644 (file)
--- a/src/internal.h
+++ b/src/internal.h
@@ -116,6 +116,14 @@
 #endif
 #endif
 
+#ifndef ATTRIBUTE_NONNULL
+# if __GNUC_PREREQ (3, 3)
+#  define ATTRIBUTE_NONNULL(m) __attribute__((__nonnull__(m)))
+# else
+#  define ATTRIBUTE_NONNULL(m)
+# endif
+#endif
+
 #else
 #ifndef ATTRIBUTE_UNUSED
 #define ATTRIBUTE_UNUSED