I'm now CCing debian-devel@. 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@gmail.com> writes: > Xiyue Deng <manphiz@gmail.com> writes: > >> (CCing the package uploaders.) >> >> Xiyue Deng <manphiz@gmail.com> writes: >> >>> Xiyue Deng <manphiz@gmail.com> writes: >>> >>>> On Fri, 27 Dec 2024 13:08:17 +0100 =?UTF-8?Q?Aniol_Mart=C3=AD?= >>>> <aniol.marti@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
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U syscall@GLIBC_2.2.5
U system@GLIBC_2.2.5
U tan@GLIBC_2.2.5
U tanh@GLIBC_2.2.5
U time@GLIBC_2.2.5
U tmpfile64@GLIBC_2.2.5
U tzset@GLIBC_2.2.5
U ungetc@GLIBC_2.2.5
--- /home/manphiz/nm-luajit-unpatched.txt 2025-12-19 06:10:00.879672259 +0000
+++ /home/manphiz/nm-luajit-patched.txt 2025-12-19 06:10:40.060033997 +0000
@@ -47,165 +47,165 @@
U getc@GLIBC_2.2.5
U getenv@GLIBC_2.2.5
U gmtime_r@GLIBC_2.2.5
-0000000000092630 D hash_dense
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+0000000000093630 D hash_dense
+0000000000093638 D hash_sparse
U ldexp@GLIBC_2.2.5
U localtime_r@GLIBC_2.2.5
U log@GLIBC_2.29
U log10@GLIBC_2.2.5
U log2@GLIBC_2.29
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+0000000000078640 T luaopen_table
U memchr@GLIBC_2.2.5
U memcmp@GLIBC_2.2.5
U memcpy@GLIBC_2.14
@@ -224,8 +224,8 @@
U pow@GLIBC_2.29
U putc@GLIBC_2.2.5
U read@GLIBC_2.2.5
-000000000002e510 T recff_thread_exdata
-000000000002e5b0 T recff_thread_exdata2
+000000000002fd10 T recff_thread_exdata
+000000000002fdc0 T recff_thread_exdata2
U remove@GLIBC_2.2.5
U rename@GLIBC_2.2.5
U setitimer@GLIBC_2.2.5
@@ -239,7 +239,7 @@
U stderr@GLIBC_2.2.5
U stdin@GLIBC_2.2.5
U stdout@GLIBC_2.2.5
-0000000000078580 T str_hash_init_sse42
+000000000007a360 T str_hash_init_sse42
U strchr@GLIBC_2.2.5
U strcmp@GLIBC_2.2.5
U strcpy@GLIBC_2.2.5
Attachment:
signature.asc
Description: PGP signature