[pkg-lua-devel] Bug#781728: Bug#781728: Lua 5.2 compat

Fri Dec 19 11:35:27 GMT 2025

Any reason to not use
https://salsa.debian.org/salsa-ci-team/pipeline#enable-build-reverse-dependencies

?
I can do it if needed.

Le ven. 19 déc. 2025 à 09:37, Ondřej Surý <ondrej at sury.org> a écrit :

> As I had couple of spare cycles, the updated package is now in
> experimental.
>
> I don't have the time to test all the downstream dependencies, so I would
> appreciate if you can walk through all the packages that Build-Depend or
> Depend on luajit and test whether everything works as expected.
>
> If you send me your salsa login, I can add you as a co-maintainer of the
> luajit package.
>
> (I'm not subscribed to d-d).
>
> Ondrej
> --
> Ondřej Surý (He/Him)
> ondrej at sury.org
>
> > On 19. 12. 2025, at 8:37, Xiyue Deng <manphiz at gmail.com> wrote:
> >
> > I'm now CCing debian-devel at .  Please excuse the top posting where I
> > explain the status quo and seek for advice.
> >
> > Bug#781728 is about enabling Lua 5.2 compatible mode in LuaJIT, which
> > has been supported for at least 13 years (see the last commit touching
> > the macro definition at [1]).  The main client using this is Aegisub
> > which since 3.4.2 requires LuaJIT to enable 5.2 compatible mode.
> > Currently Aegisub embeds its own LuaJIT so as to enable this, but as the
> > embedded official LuaJIT doesn't support some of the release archs
> > e.g. ppc64el, riscv64, and s390x.  The LuaJIT in Debian supports riscv64
> > and s390x and can support ppc64el in newer versions.  I have filed
> > Bug#1116248 to Aegisub for tracking.  It would be great if the LuaJIT in
> > Debian can just enable this so that Aegisub does not need to embed it.
> > (Also CCing the Aegisub maintainer just in case.)
> >
> > There may be concerns on binary compatibility on enabling Lua 5.2
> > compatibility mode.  I'm not an expert on library API/ABI compatibility,
> > though I have done some rudimentary analysis based on library symbols,
> > e.g. output of `nm -D' of libluajit-5.1.so.2.1.1737090214 from
> > libluajit-5.1-2 package, and besides symbol addresses there is no diff
> > (please see the nm-luajit-unpatched.txt, nm-luajit-patched.txt for the
> > symbols before and after applying the patch, and
> > nm-luajit-unpatched-vs-patched.diff for the diff).  I think this should
> > suggest that it is a safe change, and even if it is not, a transition
> > should be sufficient to resolve any incompatibility.
> >
> > The reason for including debian-devel@ in the discussion is that there
> > has been no reply from the Lua maintainers or package uploaders since.
> > I'd like to first state that this email has no ill-intention, as people
> > may be busy due to life, work, etc. so it's totally understandable.  I
> > would just like to try to move things forward.  Of course, if the Lua
> > maintainers or uploaders would like to provide any guidance it would
> > still be welcome.  But in case there is none, I wonder what would be the
> > best way to proceed?  As currently I don't claim that I have the
> > required specialty to be an uploader, would a NMU be acceptable (and
> > commit to Salsa so that this doesn't get lost)?  As a DM, I would still
> > need a sponsor if this is the way forward.
> >
> > Thanks in advance!  And any advice (or suggestion to better handle this
> > situation) would be appreciated.
> >
> > (Please also see below for previous communications on this bug.)
> >
> > Xiyue Deng <manphiz at gmail.com> writes:
> >
> >> Xiyue Deng <manphiz at gmail.com> writes:
> >>
> >>> (CCing the package uploaders.)
> >>>
> >>> Xiyue Deng <manphiz at gmail.com> writes:
> >>>
> >>>> Xiyue Deng <manphiz at gmail.com> writes:
> >>>>
> >>>>> On Fri, 27 Dec 2024 13:08:17 +0100 =?UTF-8?Q?Aniol_Mart=C3=AD?=
> >>>>> <aniol.marti at riseup.net> wrote:
> >>>>>> Dear Maintainer,
> >>>>>>
> >>>>>> i am the maintainer of Aegisub. Version 3.4.0 was recently released
> but
> >>>>>> it requires LuaJIT with Lua 5.2 compat. Are there any plans about
> >>>>>> supporting it?
> >>>>>>
> >>>>>> We are currently discussing it in
> >>>>>> https://github.com/TypesettingTools/Aegisub/issues/239. One option
> that
> >>>>>> I'm considering is bundling LuaJIT with Aegisub, but the Debian
> Policy
> >>>>>> encourages not doing that. Do you know if there are any other
> packages
> >>>>>> in a similar situation?
> >>>>>>
> >>>>>> Aniol
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>
> >>>>> As David mentioned in [1], this should be as simple as adding
> >>>>> "-DLUAJIT_ENABLE_LUA52COMPAT" to CFLAGS and it should be ABI/API
> >>>>> compatible.  Please consider adding this support so that Aegisub and
> >>>>> other packages can use it directly.
> >>>>>
> >>>>> [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=781728#16
> >>>>>
> >>>>> --
> >>>>> Xiyue Deng
> >>>>
> >>>> I have tested adding the flags and the result is promising: aegisub
> can
> >>>> now directly build against libluajit-5.1-dev built with the flags and
> >>>> works well.
> >>>>
> >>>> I have created a MR on Salsa[1] and hope it can be reviewed and
> merged.
> >>>>
> >>>> [1] https://salsa.debian.org/lua-team/luajit/-/merge_requests/3
> >>>>
> >>>
> >>> Friendly ping.  This is a blocking issue for Aegisub and currently
> >>> preventing it from migrating to Forky.
> >>>
> >>> Though my previous claim may be wrong that enabling this flag may
> >>> probably require a transition.  I would like to help analyze the
> >>> situation and move this bug forward.  TIA!
> >>>
> >>
> >> Friendly ping.  It's concerning that we still haven't heard back from
> >> the Lua team, though it's understandable that the Lua team may be busy
> >> with daily life/work.  I intend to bring this topic to debian-devel@
> for
> >> comments next, not for pushing, but to seek for suggestions on resolving
> >> this issue.
> >>
> >>>> --
> >>>> Regards,
> >>>> Xiyue Deng
> >>>
> >>> --
> >>> Regards,
> >>> Xiyue Deng
> >
> > [1]
> https://github.com/LuaJIT/LuaJIT/commit/23932a6c8b7ef434bc963139b4160b1058fa6f7f
> >
> > --
> > Regards,
> > Xiyue Deng
> >
> <nm-luajit-patched.txt><nm-luajit-unpatched.txt><nm-luajit-unpatched-vs-patched.diff>
>
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