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-rw-r--r--include/c.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/c.h b/include/c.h
index b769b5843..8b2a2d19a 100644
--- a/include/c.h
+++ b/include/c.h
@@ -80,6 +80,12 @@
# endif
#endif
+#if (__GNUC__ >= 5) || ((__GNUC__ >= 4) && (__GNUC_MINOR__ >= 9))
+# define __ul_returns_nonnull __attribute__((returns_nonnull))
+#else
+# define __ul_returns_nonnull
+#endif
+
/*
* Force a compilation error if condition is true, but also produce a
* result (of value 0 and type size_t), so the expression can be used