46 lines
1.7 KiB
Diff
46 lines
1.7 KiB
Diff
From bb3ef1f5acfde9658c922d0aef9283fe60328c33 Mon Sep 17 00:00:00 2001
|
|
From: Ariadne Conill <ariadne@dereferenced.org>
|
|
Date: Fri, 21 Aug 2020 06:46:22 +0000
|
|
Subject: [PATCH 04/33] Turn on -D_FORTIFY_SOURCE=2 by default for C, C++,
|
|
ObjC, ObjC++, if the optimization level is > 0
|
|
|
|
---
|
|
gcc/c-family/c-cppbuiltin.cc | 4 ++++
|
|
gcc/doc/invoke.texi | 6 ++++++
|
|
2 files changed, 10 insertions(+)
|
|
|
|
diff --git a/gcc/c-family/c-cppbuiltin.cc b/gcc/c-family/c-cppbuiltin.cc
|
|
index 5d64625fcd7..868d69506e4 100644
|
|
--- a/gcc/c-family/c-cppbuiltin.cc
|
|
+++ b/gcc/c-family/c-cppbuiltin.cc
|
|
@@ -1546,6 +1546,10 @@ c_cpp_builtins (cpp_reader *pfile)
|
|
builtin_define_with_value ("__REGISTER_PREFIX__", REGISTER_PREFIX, 0);
|
|
builtin_define_with_value ("__USER_LABEL_PREFIX__", user_label_prefix, 0);
|
|
|
|
+ /* Fortify Source enabled by default for optimization levels > 0 */
|
|
+ if (optimize)
|
|
+ builtin_define_with_int_value ("_FORTIFY_SOURCE", 2);
|
|
+
|
|
/* Misc. */
|
|
if (flag_gnu89_inline)
|
|
cpp_define (pfile, "__GNUC_GNU_INLINE__");
|
|
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
|
|
index cb34e6d40c9..7f1aa660285 100644
|
|
--- a/gcc/doc/invoke.texi
|
|
+++ b/gcc/doc/invoke.texi
|
|
@@ -11866,6 +11866,12 @@ also turns on the following optimization flags:
|
|
Please note the warning under @option{-fgcse} about
|
|
invoking @option{-O2} on programs that use computed gotos.
|
|
|
|
+NOTE: In Alpine Linux, @option{-D_FORTIFY_SOURCE=2} is
|
|
+set by default, and is activated when @option{-O} is set to 2 or higher.
|
|
+This enables additional compile-time and run-time checks for several libc
|
|
+functions. To disable, specify either @option{-U_FORTIFY_SOURCE} or
|
|
+@option{-D_FORTIFY_SOURCE=0}.
|
|
+
|
|
@opindex O3
|
|
@item -O3
|
|
Optimize yet more. @option{-O3} turns on all optimizations specified
|
|
--
|
|
2.41.0
|
|
|