Re: Cross compiling Lua byte code

[David Jones <drj@...>]

On May 04, 2006, at 21:41, Joshua Jensen wrote:

> Luiz Henrique de Figueiredo wrote:
> > void luaU_header (char* h)
> > {
> >  int x=1;
> >  *h++=(char)*(char*)&x;				/* endianness */
> > }
> A small point of interest.  When working the Xbox 360, the above 
> endianness didn't work using a local variable.  Instead, I had to 
> create a static global.  :(  This was under Lua 5.0, but I'm guessing 
> it will still apply now.
>
> static int x = 1;
>
> int luaU_endianness (void)
> {
> /* int x=1; */
> return *(char*)&x;
> }
>
> Take it for what it's worth.

A compiler bug.  Accessing any C type by treating it as an array of 
char is completely legal.  Aliasing must be be honoured.  That's how 
memcpy works, it copies objects char by char (at least conceptually).

drj