Index: stable/10/bin/expr/Makefile
===================================================================
--- stable/10/bin/expr/Makefile	(revision 281147)
+++ stable/10/bin/expr/Makefile	(revision 281148)
@@ -1,15 +1,18 @@
 # $FreeBSD$
 
 .include <bsd.own.mk>
 
 PROG=	expr
 SRCS=	expr.y
 YFLAGS=
 
+# expr relies on signed integer wrapping
+CFLAGS+= -fwrapv
+
 NO_WMISSING_VARIABLE_DECLARATIONS=
 
 .if ${MK_TESTS} != "no"
 SUBDIR+=	tests
 .endif
 
 .include <bsd.prog.mk>
Index: stable/10
===================================================================
--- stable/10	(revision 281147)
+++ stable/10	(revision 281148)

Property changes on: stable/10
___________________________________________________________________
Modified: svn:mergeinfo
## -0,0 +0,1 ##
   Merged /head:r280357
Index: stable/9/bin/expr/Makefile
===================================================================
--- stable/9/bin/expr/Makefile	(revision 281147)
+++ stable/9/bin/expr/Makefile	(revision 281148)
@@ -1,7 +1,10 @@
 # $FreeBSD$
 
 PROG=	expr
 SRCS=	expr.y
 YFLAGS=
 
+# expr relies on signed integer wrapping
+CFLAGS+= -fwrapv
+
 .include <bsd.prog.mk>
Index: stable/9/bin/expr
===================================================================
--- stable/9/bin/expr	(revision 281147)
+++ stable/9/bin/expr	(revision 281148)

Property changes on: stable/9/bin/expr
___________________________________________________________________
Modified: svn:mergeinfo
## -0,0 +0,1 ##
   Merged /head/bin/expr:r280357
Index: stable/9/bin
===================================================================
--- stable/9/bin	(revision 281147)
+++ stable/9/bin	(revision 281148)

Property changes on: stable/9/bin
___________________________________________________________________
Modified: svn:mergeinfo
## -0,0 +0,1 ##
   Merged /head/bin:r280357
Index: stable/9
===================================================================
--- stable/9	(revision 281147)
+++ stable/9	(revision 281148)

Property changes on: stable/9
___________________________________________________________________
Modified: svn:mergeinfo
## -0,0 +0,1 ##
   Merged /head:r280357