1 files changed, 46 insertions, 0 deletions
diff --git a/repo/gcc/0004-Turn-on-D_FORTIFY_SOURCE-2-by-default-for-C-C-ObjC-O.patch b/repo/gcc/0004-Turn-on-D_FORTIFY_SOURCE-2-by-default-for-C-C-ObjC-O.patch
new file mode 100644
index 0000000..4b87403
--- /dev/null
+++ b/repo/gcc/0004-Turn-on-D_FORTIFY_SOURCE-2-by-default-for-C-C-ObjC-O.patch
@@ -0,0 +1,46 @@
+From 3c848f2fbde81db336ec97d9be7a5a4a05015eef Mon Sep 17 00:00:00 2001
+From: Ariadne Conill <ariadne@dereferenced.org>
+Date: Fri, 21 Aug 2020 06:46:22 +0000
+Subject: [PATCH] Turn on -D_FORTIFY_SOURCE=2 by default for C, C++, ObjC,
+ ObjC++, if the optimization level is > 0
+
+---
+ gcc/c-family/c-cppbuiltin.c | 4 ++++
+ gcc/doc/invoke.texi         | 6 ++++++
+ 2 files changed, 10 insertions(+)
+
+diff --git a/gcc/c-family/c-cppbuiltin.c b/gcc/c-family/c-cppbuiltin.c
+index db91a36794a..ed976c71404 100644
+--- a/gcc/c-family/c-cppbuiltin.c
++++ b/gcc/c-family/c-cppbuiltin.c
+@@ -1385,6 +1385,10 @@ 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 17d371ef432..fe793ac08db 100644
+--- a/gcc/doc/invoke.texi
++++ b/gcc/doc/invoke.texi
+@@ -9230,6 +9230,12 @@ 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}.
++
+ @item -O3
+ @opindex O3
+ Optimize yet more.  @option{-O3} turns on all optimizations specified
+-- 
+2.31.1
+