Re: Cross compiling for VIA C3?

[Charlie Brady <charlieb-supervision@budge.apana.org.au>]

On Sat, 20 Nov 2004 yoppo@jippii.fi wrote:

>>> Is it possible to cross-compile runit for VIA C3 system? If yes then 
>>> how?
>>> 
>>> If I compile it normally on my athlon machine it doesn't work at all 
>>> in my NAT-machine (VIA).
>> 
>> afair via c3 lack of cmov, what produce 'some' problems when 
>> crosscompiling, what optimizations are you using?

You're not really cross compiling in the classical sense when compiling on 
an athlon for a via c3 target. They're both 100% i386 compatible, as I 
understand it. Certainly the types of compile/link/run tests that the 
build system does to determine available OS features will provide the 
correct answers, so that part of the cross-compilation puzzle isn't an 
issue.

> The latest try was with -O2 -march=i586 -mcpu=i586 don't know if Iam missing 
> something, but it seems like it could not be cross compiled just changing the 
> optimizations.
>
> Now after studying the compile process it seems like it makes some kind of 
> testing on compile time but I dont have any clues how to "hack" the compile 
> process so it would work in the VIA C3.

I don't think you need to. Just set the compile options correctly to get 
the right instruction set to be used.

What runtime problems do you have when you try to execute the binaries 
compiled under athlon on the c3?

---
Charlie