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

Fri Dec 19 11:39:19 GMT 2025

Also (sorry for the top-post mode), since it is in experimental,
checking this page will help (wait a day or two to  see it populated)
https://qa.debian.org/excuses.php?experimental=1&package=luajit

Le ven. 19 déc. 2025 à 12:37, Ondřej Surý <ondrej at sury.org> a écrit :

> Sure, go ahead. I just didn’t know that this exists.
> --
> Ondřej Surý (He/Him)
>
> On 19. 12. 2025, at 12:36, Jérémy Lal <kapouer at melix.org> wrote:
>
> 
> 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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