From 1203d721ce137abe78d9d412652a7670a62afc6f Mon Sep 17 00:00:00 2001
From: Loganaden Velvindron <logan@hackers.mu>
Date: Sun, 18 Feb 2018 18:58:24 +0400
Subject: [PATCH] Add spectre v2 migitations for GCC

---
 configure.ac | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/configure.ac b/configure.ac
index fb579f4f..dc7afb28 100644
--- a/configure.ac
+++ b/configure.ac
@@ -202,6 +202,9 @@ AC_CHECK_DEFINE([_FORTIFY_SOURCE], [], [
 AX_CHECK_COMPILE_FLAG([-fvisibility=hidden],
   [CFLAGS="$CFLAGS -fvisibility=hidden"])
 
+AX_CHECK_COMPILE_FLAG([-mfunction-return=thunk -mindirect-branch=thunk],
+  [CFLAGS="$CFLAGS -mfunction-return=thunk -mindirect-branch=thunk"])
+
 AS_CASE([$host_os], [cygwin*|mingw*|msys|pw32*|cegcc*], [ ], [
   AX_CHECK_COMPILE_FLAG([-fPIC], [CFLAGS="$CFLAGS -fPIC"])
 ])