Bug#909536: mozjs60: FTBFS on s390x: around 80% of tests crash

[Simon McVittie]

On Mon, 24 Sep 2018 at 21:18:47 +0100, Simon McVittie wrote:
> Most of the test cases provided with mozjs60 crash:
> 
> grep '^TEST-' s390x.log | cut -d' ' -f1 | sort | uniq -c
>    1714 TEST-KNOWN-FAIL
>    6923 TEST-PASS
>   28635 TEST-UNEXPECTED-FAIL

This seems to be endianness-related (works on 32-bit and on little-endian, but
is broken on 64-bit big-endian) so perhaps PowerPC porters would be interested
in helping here?

Upstream bug: https://bugzilla.mozilla.org/1488552

My best attempt at backporting fixes (still fails many tests on s390x):
https://salsa.debian.org/gnome-team/mozjs60/merge_requests/1

I've got as far as I can with this and would really appreciate a porter
or a Mozilla expert taking over.

Note that any patches proposed for this should also be tested on 32-bit BE
(mips or powerpc) since it looks as though the patches that were applied
upstream are probably going to break those.

    smcv