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List:       gentoo-dev
Subject:    [gentoo-dev] [PATCH 1/5] toolchain-funcs.eclass: add tc-enables-fortify-source for FORTIFY_SOURCE
From:       Sam James <sam () gentoo ! org>
Date:       2023-01-30 1:47:04
Message-ID: 20230130014708.2898311-1-sam () gentoo ! org
[Download RAW message or body]

As Zero_Chaos reported on IRC, the check we had wasn't good enough in systemd*
(before we were able to remove it), as it wouldn't fire for e.g. -Os. While we
could've changed it to fail safe (always unset, then set a lower F_S if possible),
let's add a proper helper instead to the eclass.

Bug: https://bugs.gentoo.org/841770
Bug: https://bugs.gentoo.org/847148
Bug: https://bugs.gentoo.org/876893
Signed-off-by: Sam James <sam@gentoo.org>
---
 eclass/toolchain-funcs.eclass | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/eclass/toolchain-funcs.eclass b/eclass/toolchain-funcs.eclass
index bfcd6819ed0b0..b9e956098b3e2 100644
--- a/eclass/toolchain-funcs.eclass
+++ b/eclass/toolchain-funcs.eclass
@@ -1,4 +1,4 @@
-# Copyright 2002-2022 Gentoo Authors
+# Copyright 2002-2023 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 # @ECLASS: toolchain-funcs.eclass
@@ -1006,6 +1006,15 @@ tc-enables-pie() {
 	tc-cpp-is-true "defined(__PIE__)" ${CPPFLAGS} ${CFLAGS}
 }
 
+# @FUNCTION: tc-enables-fortify-source
+# @RETURN: Truth if the current compiler enables FORTIFY_SOURCE at any level
+# @DESCRIPTION:
+# Return truth if the current compiler enables fortification (FORTIFY_SOURCE)
+# at any level (-D_FORTIFY_SOURCE).
+tc-enables-fortify-source() {
+	tc-cpp-is-true "defined(_FORTIFY_SOURCE)" ${CPPFLAGS} ${CFLAGS} ${CXXFLAGS}
+}
+
 # @FUNCTION: tc-enables-ssp
 # @RETURN: Truth if the current compiler enables stack smashing protection (SSP) on \
at least minimal level  # @DESCRIPTION:
-- 
2.39.1


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