Re: universal binaries

[Rogelio M. Serrano Jr.]

Markus Hitter wrote:
> Am 13.01.2007 um 19:04 schrieb Rogelio Serrano:
>
> > How does apple do it?
>
> Universal binaries are two or more ordinary binaries in a row, 
> together with a header in front of it. All this is put into one file.
>
> To launch a Universal Binary (UB), the kernel's execve() recognizes 
> the UB header in addition to ordinary binaries (and scripts). If 
> execve() finds such a header, it sets a file offset to the binary 
> matching the current architecture and starts over.
Thats very clever.

> > With Mach-o?
>
> I don't think this is limited to some sort of ABI other than by patent 
> issues. In principle, you should even be able to stitch together 
> mach-o and ELF binaries. You'd have to modify the current Mac OS X 
> kernel to get this working.
Im planning to do this on linux and exopc.

> > is it enough to compile and cross
> > compile and just put them all together in an application bundle?
>
> No.
>
> The stitching tool is named "lipo", to help your googling.

> HTH,
> Markus
>
> - - - - - - - - - - - - - - - - - - -
> Dipl. Ing. Markus Hitter
> http://www.jump-ing.de/
>
>
>
>
>
>
> _______________________________________________
> Discuss-gnustep mailing list
> Discuss-gnustep@gnu.org
> http://lists.gnu.org/mailman/listinfo/discuss-gnustep

signature.asc
Description: OpenPGP digital signature