Bad light usedata pointer LuaJIT 64 bits again

[Victor Bombi]

local lanes = require"lanes"

returns

C:\supercolliderrepos\aaabuildlua2sctest64\install\luajit.exe: bad light userdata pointer
stack traceback:
        [C]: at 0x618c44d0
        [C]: in function 'require'
        ...colliderrepos\aaabuildlua2sctest64\install\lua\lanes.lua:38: in main chunk
        [C]: in function 'require'
        C:\Lua2SCinstalled\test.lua:1: in main chunk
        [C]: at 0x00402070

I cant bisect properly because all happened when CMakeList was temporaly broken (I can only build with cmake) But it should be around commit 7b4f59c

[Benoit Germain]

All I can think of is that LuaJIT uses some bits of the light userdata value for internal purposes, and expects all provided values with those bits cleared. See uniquekey.h. Maybe for some reason the masking is wrong or the detection incorrect...

[Victor Bombi]

Yes,
LuaJIT/LuaJIT#450 (comment)

Ok I see
#if defined LUA_JITLIBNAME // building against LuaJIT headers, add some LuaJIT-specific libs

So it is no runtime detection but compile time if using LuaJIT headers, I must recompile.

[Victor Bombi]

That was the problem!!!
Thanks!!