Re: New diff test failures on s390x architecture (was: [ANNOUNCE] Git v2.22.0-rc1)

>
> I wrote:
> > While running the 2.22.0-rc1 tests on Fedora, I hit a few
> > new test failures since 2.21.0 -- but only on the s390x
> > architecture.
> >
> > I haven't had time to dig into these the past few days, so I
> > thought I would send what I do have in case the problem is
> > obvious to someone else.  I think all of the failing tests
> > are due to `git diff` commands.
> [...]
> > I don't have direct access to these s390x builders.  I may
> > be able to arrange shell access (or even reproduce this with
> > qemu's s390x emulation).
>
> I poked around a little with a qemu s390x instance and see
> the same failures.
>
> One simple failure in t4015 is with:
>
>     git diff -w >out &&
>     test_must_be_empty out
>
> Using git-2.21.0 this succeeds, while git-2.22.0-rc1 fails
> and produces:
>
>     diff --git a/x b/x
>     index d99af23..22d9f73 100644
>     --- a/x
>     +++ b/x
>     @@ -1,6 +1,6 @@
>     -whitespace at beginning
>     -whitespace change
>     -whitespace in the middle
>     -whitespace at end
>     +   whitespace at beginning
>     +whitespace          change
>     +white space in the middle
>     +whitespace at end
>      unchanged line
>     -CR at end
>     +CR at end
>
> I am guessing it's no coincidence that this only fails on
> s390x and it is the only big endian architecture in the
> fedora build system.