[glibc] Warn on unsupported fortification levels
Siddhesh Poyarekar
siddhesh@sourceware.org
Thu Dec 31 11:27:23 GMT 2020
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2a08b6e8331a611dc29325bfa6e29fecc9a3a46e
commit 2a08b6e8331a611dc29325bfa6e29fecc9a3a46e
Author: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date: Thu Dec 10 16:47:02 2020 +0530
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:
---
include/features.h | 3 +++
1 file changed, 3 insertions(+)
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
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