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-rw-r--r--include/features.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/features.h b/include/features.h
index f3e62d3362..540230b90b 100644
--- a/include/features.h
+++ b/include/features.h
@@ -398,6 +398,9 @@
 # elif !__GNUC_PREREQ (4, 1)
 #  warning _FORTIFY_SOURCE requires GCC 4.1 or later
 # elif _FORTIFY_SOURCE > 1
+#  if _FORTIFY_SOURCE > 2
+#   warning _FORTIFY_SOURCE > 2 is treated like 2 on this platform
+#  endif
 #  define __USE_FORTIFY_LEVEL 2
 # else
 #  define __USE_FORTIFY_LEVEL 1