Re: Jenkins build is still unstable: FreeBSD_HEAD-tests2 #867

On Sun, Mar 22, 2015 at 2:29 PM, Dimitry Andric <dim_at_freebsd.org> wrote:

>
> Ah right, that was on i386, on amd64 it does result in -2^63.  It is
> indeed caused by reliance on signed integer wrapping.
>
> This diff should fix it, without rewriting the utility:
>
> Index: bin/expr/Makefile
> ===================================================================
> --- bin/expr/Makefile   (revision 280156)
> +++ bin/expr/Makefile   (working copy)
> _at__at_ -6,6 +6,9 _at__at_ PROG=   expr
>  SRCS=  expr.y
>  YFLAGS=
>
> +# expr relies on signed integer wrapping
> +CFLAGS+= -fwrapv
> +
>  NO_WMISSING_VARIABLE_DECLARATIONS=
>
>  .if ${MK_TESTS} != "no"
>


Well, another alternative is to patch expr.y:

Index: expr.y
===================================================================
--- expr.y      (revision 280353)
+++ expr.y      (working copy)
_at__at_ -393,7 +393,7 _at__at_
 }

 void
-assert_plus(intmax_t a, intmax_t b, intmax_t r)
+assert_plus(intmax_t a, intmax_t b, volatile intmax_t r)
 {
        /*
         * sum of two positive numbers must be positive,
_at__at_ -420,7 +420,7 _at__at_
 }

 void
-assert_minus(intmax_t a, intmax_t b, intmax_t r)
+assert_minus(intmax_t a, intmax_t b, volatile intmax_t r)
 {
        /* special case subtraction of INTMAX_MIN */
        if (b == INTMAX_MIN && a < 0)


There were already some patches previously done to this
file to add "volatile", so maybe this would be OK to do.

What do you think?

--
Craig