Re: generating 32-bit RPM's

[John Haxby <jch@xxxxxxxxxx>]

Joshua Jensen wrote:

> > But, 32-bit and 64-bit are both x86.  It's not like he's trying to
> > compile for SPARC or PowerPC here, which *would* need a
> > cross-compiler.  See below.
> >    
>
> No they aren't.  A 32 bit binary is very very different than a 64bit 
> one.  Sure, the machine code from IA32 looks more similar to x86-64 code 
> than say 64bit PPC, but it isn't the same and they should be considered 
> completely seperate archs.
>
>  
Well, that's a bit strong.   I can compile and run programs on an i386 
machine and copy those same compiled programs to an x86_64 machine and 
they run just fine.   Similarly, If I "gcc -m32" something on the x86_64 
machine it runs on the i386 machine.   The only thing that won't work is 
a "gcc -m64" program running on an i386.    They may be different 
architectures, but, really and truly you can regard the x86_64 as a 
strict superset of i386 from an application programming point of view.

Compare that with, say, SPARC64 vs i386.   There's nothing I can compile 
on either platform that will run on both.   Apart from python and java 
maybe :-)

jch

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