Re: Local variables in the main block are global

[Dirk Laurie <dirk.laurie@...>]

2013/4/21 Dirk Laurie <dirk.laurie@gmail.com>:
> 2013/4/21 Dirk Laurie <dirk.laurie@gmail.com>:
>> Sorry, hit the sent button too soon. The behaviour of the
>> title occurs in a long module of mine, and I am still trying
>> to isolate it. It's not that simple. Sorry!
>
> Turns out I have been too clever for my own good.
>
> My module loads another module written in C. That module has a tiny bit
> of initialization code in Lua. I use a global variable also called
> 'X' in there; I delete it immediately, but the bug detector picks it up.
> The C file ends something like this:
>
> ~~~
> char *mymodule_init =
> "for k,v in pairs(_G) do X[k]=v end "
> "X=nil"
> ;
>
> LUAMOD_API int luaopen_mymodule_core (lua_State *L) {
>   luaL_newlib(L, myfuncs);
>   lua_pushvalue(L,-1); lua_setglobal(L,"X");
>   (void)luaL_dostring(L,mymodule_init);
>   return 1;
> }
> ~~~
>
> Actually, I have not been clever at all. Global variables with one-letter
> names are hazardous even in initializion code in a C module, The bug
> detector in my original accidental post does exactly what it should.