cross compiling

[Larry Brigman]

On 4/9/07, Franklin <franklin at goodhorse.idv.tw> wrote:
> Larry Brigman's messages:
> > I am trying to switch versions of busybox from 1.2.2 to 1.4.2
> > and it looks like the configuration for setting cross compile is now
> > different enough that my old method doesn't work.
> >
> > Previously I just set CROSS_COMPILE and all the various tool env variables
> > to point to the correct tool and added any necessary CFLAGS via
> > EXTRA_CFLAGS=
> >
> > It doesn't seem to pick up the CROSS_COMPILE var from the environment when
> > doing 'make oldconfig'  it has to be added to the command line.
> >
> > If I don't provide ARCH it makes an assumption and passes -march=i386 to
> > the compiler which doesn't work.  Adding during 'make oldconfig' doesn't
> > get recorded for
> > the 'make all'
> >
> > So the question (which isn't in the FAQ or on google for a recent version)
> > is: What is the proper way to configure and make busybox for cross compile?
> >
>
> I simply define ARCH and CROSS_COMPILE in the Makefile.
> You can search for it in Makefile, about line 175.
>
> ARCH            := powerpc
> CROSS_COMPILE   := powerpc-linux-

Useful but the source tree I am working on tries to build for multiple CPU types
(currently three).  I cannot commit change to the Makefile that is
platform specific.