You're right, I just checked the symbols of luatex and they contain all the APIs of lua 5.3. So I guess the problem is specific to luametatex and the latest context.

but in any case you should compile against the luatex headers, not the stock lua 5.3.6.

Does luatex have dedicated headers different from the ones for stock lua? On Fri, 23 Apr 2021 at 23:53, luigi scarso wrote:

On Fri, Apr 23, 2021 at 10:08 PM Sylvain Hubert wrote:

...

Dear Devs,

Sorry if this is not the best place for reporting bugs.

I'm trying to use the lpeglabel library written in C and delivered as lpeglabel.so.

$ ls testlabel.lua lpeglabel.so $ cat testlabel.lua require("lpeglabel")

The ConTeXt binary cannot load the library because it lacks certain Lua API:

$ context --forcecld --permitloadlib testlabel.lua ... fatal lua error: registered function call [1542]: ...tx/tex/texmf-context/tex/context/base/mkiv/l-package.lua:348: error loading module 'lpeglabel' from file './lpeglabel.so': ./lpeglabel.so: undefined symbol: lua_gettop

hm, lua_gettop is a global symbol in latest luatex, it's not undefined...

...

nor does LuaTeX: $ luatex -luaonly testlabel.lua error loading module 'lpeglabel' from file './lpeglabel.so': ./lpeglabel.so: undefined symbol: lua_getiuservalue

lua_getiuservalue is in lua 5.4 API, luatex is lua 5.3.6 API but in any case you should compile against the luatex headers, not the stock lua 5.3.6. I don't know lpeglabel, but luatex has the lpeg embedded and perhaps it can clash with the library.

-- luigi

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