LuaJIT: print(jit) and print(require('jit')) are different.

[spaderthomas]

StackOverflow post: https://stackoverflow.com/questions/72081958/why-does-luajits-jit-module-appear-as-a-string-when-loaded-through-require

Hi. I noticed something strange. I compiled a program using Sol3 (cloned from this repo on the day of posting) and LuaJIT (2.1.0-beta3, pulled from Arch repositories). The problem: print(jit) and print(require('jit')) return different things. The former returns a table, while the latter returns a string.

Some internal LuaJIT libraries require LuaJIT via require('jit'), and then try to index it as a table. For example, p.lua (the profiler). This explodes quickly and violently for obvious reasons.

I made a repro here. If the built library does not work on your machine, I just cloned the LuaJIT repository and ran make install into the repo directory. Here's the output:

inspect(jit): 	{
  arch = "x64",
  attach = <function 1>,
  flush = <function 2>,
  off = <function 3>,
  on = <function 4>,
  opt = {
    start = <function 5>
  },
  os = "Linux",
  security = <function 6>,
  status = <function 7>,
  version = "LuaJIT 2.1.0-beta3",
  version_num = 20100
}
inspect(require("jit"))	"LuaJIT 2.1.0-beta3"

https://github.com/spaderthomas/luajit-sol-repro

I am not sure if this is me being silly, or a bug somewhere.

[spaderthomas]

Hi, just giving this a little bump. Thanks for your time!