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-rw-r--r--misc/sys/cdefs.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index 7794e4e26d..f5f18e914c 100644
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -214,6 +214,15 @@
 # define __attribute_malloc__ /* Ignore */
 #endif
 
+/* Tell the compiler which arguments to an allocation function
+   indicate the size of the allocation.  */
+#if __GNUC_PREREQ (4, 3)
+# define __attribute_alloc_size__(params) \
+  __attribute__ ((__alloc_size__ params))
+#else
+# define __attribute_alloc_size__(params) /* Ignore.  */
+#endif
+
 /* At some point during the gcc 2.96 development the `pure' attribute
    for functions was introduced.  We don't want to use it unconditionally
    (although this would be possible) since it generates warnings.  */