From: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date: Thu, 10 Dec 2020 11:17:02 +0000 (+0530)
Subject: Warn on unsupported fortification levels
X-Git-Tag: glibc-2.33~115
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2a08b6e8331a611dc29325bfa6e29fecc9a3a46e;p=thirdparty%2Fglibc.git

Warn on unsupported fortification levels

Make the _FORTIFY_SOURCE macro soup in features.h warn about
unsupported fortification levels.  For example, it will warn about
_FORTIFY_SOURCE=3 and over with an indication of which level has been
selected.

Co-authored-by: Paul Eggert <eggert@cs.ucla.edu>
---

diff --git a/include/features.h b/include/features.h
index f3e62d3362b..540230b90b5 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