From c969922258cedb8ec9cf9d117aedaf4082bca3af Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Sun, 22 Mar 2015 22:40:32 +0000
Subject: [PATCH] Build expr with -fwrapv, since it relies on signed integer
 wrapping having defined behavior.

Reported by:	rodrigc
MFC after:	3 days
---
 bin/expr/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/bin/expr/Makefile b/bin/expr/Makefile
index a1f6cbf2109..1d741b7e0b6 100644
--- a/bin/expr/Makefile
+++ b/bin/expr/Makefile
@@ -6,6 +6,9 @@ PROG=	expr
 SRCS=	expr.y
 YFLAGS=
 
+# expr relies on signed integer wrapping
+CFLAGS+= -fwrapv
+
 NO_WMISSING_VARIABLE_DECLARATIONS=
 
 .if ${MK_TESTS} != "no"