Re: Cross-compile (i386/ARM) question

["steve donovan" <steve.j.donovan@...>]

Double on ARMs can be very weird - we hit this problem!

steve d.

On 8/27/08, Bogdan Marinescu <bogdan.marinescu@gmail.com> wrote:
> Hi list,
>
> I'm trying to compile a Lua source file on the PC (with the standard
> luac compiler, I'm not using the cross-compile patch that was posted
> on this list a while ago ) and then run the compiled bytecode on my
> ARM boards. Keep in mind that:
>
> - i386 and ARM are both little endian
> - and 32 bits (as I'm using the 32-bit mode on my dual core CPU).
> - and the data types are the same
> This almost works. Almost, as in "some parts of the code work, and
> some don't, and I can't find a pattern for this". Lua does NOT return
> an error on the compiled work, it just doesn't execute it properly. Of
> course, the source code works all the time.
> So what's left? Maybe the floating point data types have different
> representations and/or semantics? I'm not really using floating point,
> but the Lua's number type is the default (double), so everything works
> in double. I'm using GCC for ARM to compile my code, without any
> specific options for floating point code generation.
>
> Thanks,
> Bogdan
>