[lxc-devel] [lxc/master] autools: use -fno-strict-aliasing

[brauner on Github]

A non-text attachment was scrubbed...
Name: not available
Type: text/x-mailbox
Size: 575 bytes
Desc: not available
URL: <http://lists.linuxcontainers.org/pipermail/lxc-devel/attachments/20181012/7187adf1/attachment.bin>
-------------- next part --------------
From a3bb6b8ed95013f9e7b21db833cd5d0da6671019 Mon Sep 17 00:00:00 2001
From: Christian Brauner <christian.brauner at ubuntu.com>
Date: Fri, 12 Oct 2018 21:23:07 +0200
Subject: [PATCH] autools: use -fno-strict-aliasing

The gcc implementation and the C standard are not to be considered sane
in this respect. We don't want to risk reordering of writes when the
compiler incorrectly *thinks* two types do not alias each other.

Signed-off-by: Christian Brauner <christian.brauner at ubuntu.com>
---
 configure.ac | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configure.ac b/configure.ac
index cbd6dbb7b..a7358fe59 100644
--- a/configure.ac
+++ b/configure.ac
@@ -694,6 +694,7 @@ AX_CHECK_COMPILE_FLAG([-fdiagnostics-color], [CFLAGS="$CFLAGS -fdiagnostics-colo
 AX_CHECK_COMPILE_FLAG([-Wimplicit-fallthrough], [CFLAGS="$CFLAGS -Wimplicit-fallthrough"],,[-Werror])
 AX_CHECK_COMPILE_FLAG([-Wcast-align], [CFLAGS="$CFLAGS -Wcast-align"],,[-Werror])
 AX_CHECK_COMPILE_FLAG([-Wstrict-prototypes], [CFLAGS="$CFLAGS -Wstrict-prototypes"],,[-Werror])
+AX_CHECK_COMPILE_FLAG([-fno-strict-aliasing], [CFLAGS="$CFLAGS -fno-strict-aliasing"],,[-Werror])
 
 AX_CHECK_LINK_FLAG([-z relro], [LDLAGS="$LDLAGS -z relro"],,[])
 AX_CHECK_LINK_FLAG([-z now], [LDLAGS="$LDLAGS -z now"],,[])