Re: building native cross compiler

[Michael Zintakis <michael dot zintakis at googlemail dot com>]

> > From what I gather by reading the INSTALL (and FAQ) files from the
> > source archives I would need to build glibc separately, after I built
> > binutils, use the same prefix and probably specify the
> > "--with-headers" option as well. I take it glibc won't be relying on
> > the GCC cross-compiler otherwise we have a chicken-and-egg scenario on
> > our hands?
> >     
>
> There is a chicken-and-egg scenario.
:-(

I sort of thought as much by what I looked at so far...

>   You need to first build a vanilla
> cross-compiler without building the library.
What does constitute a "vanilla cross-compiler"? Is this a "limited" 
cross-compiler without the glibc dependencies (because that is the only 
way I think possible to have glibc and a fully-fledged cross compiler 
the way I want it)?

>   You need to use that to
> build glibc.  Then you need to use glibc to build the full
> cross-compiler.
>   
I see, thought as much. Small steps and all that!


> > Finally, in the same file there is mention that I would also need the
> > header files for the Linux arch (presumably the target arch as I
> > already have the host ones installed) - is that really a requirement?
> >     
>
> As far as I know, it is a requirement.
>   
I've just downloaded the headers, but (see below) I think I found 
exactly what I was looking for...

> > Also, I take it it is not possible to build glibc at the same time I
> > build GCC (i.e. by dropping the source tree into the GCC main tree),
> > right?
> >     
>
> Right.
>
> Anyhow look at http://kegel.com/crosstool/ .
>   
W-H-A-T a gem that crosstool.sh file is (provided it works though)!

According to the help page it even builds a canadian cross (build - 
x86_64, host & target - ppc) though I have to execute it 3 times to get 
that done - that is my GCC2 & 3 built straight away (again, on the 
proviso that it works - a big if though). I am looking at the various 
variables it requires right now and see if I can manage to include my 
own compiler/optimisation options before I fire it up.

If that little gem does what it is supposed to I will be extremely happy 
as about 40% of my job will be done - just like that! Fingers crossed 
though.

MZ