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Re: Moving along Pure64

On Thu, Apr 01, 2004 at 01:09:08PM -0700, Greg Johnson wrote:
> On Thu, Apr 01, 2004 at 10:38:21AM -0600, John Goerzen wrote:
> > Hi,
> > 
> > We need a few things to happen to get pure64 going better.
> > 
> > At the top of the list is a gcc that can build 32- and 64-bit binaries
> > but defaults to 64-bit mode.  This is more difficult than it may appear
> > at first.
> I was able to build a working cross compiler for building 32bit binaries
> on x64-64.  The existing binutils are already biarch.  Unfortunately,
> the harddrive my cross compiler was on failed.  If anybody's interested,
> I might be able to recreate it. 

That would be excellent.

> With the cross compiler, I could build a 64 bit kernel with 32 bit support.
> The kernel (2.6.x) actually only has one C file that needs to be
> compiled in 32bit mode.  That file is arch/x86_64/boot/compressed/misc.c

Does that hold if one wants to run 32-bit binaries also?

> All the other 32bit objects are generated from assembly files which our
> as can already handle.  The kernel makefiles have to be fixed, though to
> call as rather than gcc for the .S files.

Ah, that could be an issue to.

> BTW, is the biarch gcc necessary for anything other than the kernel?

No, unless it requires a 32-bit libc.

-- John

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