lkml.org 
[lkml]   [2007]   [Oct]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] Make m68k cross compile like every other architecture.
On Thu, 11 Oct 2007, Rob Landley wrote:
> On Thursday 11 October 2007 7:46:47 am Geert Uytterhoeven wrote:
> > On Thu, 11 Oct 2007, Sam Ravnborg wrote:
> > > On Thu, Oct 11, 2007 at 09:25:19AM +0200, Geert Uytterhoeven wrote:
> > > > On Wed, 10 Oct 2007, Rob Landley wrote:
> > > > > Rip out hardwired cross compiler name assumption that only m68k
> > > > > makes.
> > > > >
> > > > > Signed-off-by: Rob Landley <rob@landley.net>
> > > > > ---
> > > > > When you cross compile, you have to set the prefix CROSS_COMPILE to
> > > > > your cross compiler prefix. You need to do this for all targets
> > > > > (arm, mips, ppc, x86-64 on x86, etc). This is not specific to m68k,
> > > > > and this value is supplied _to_ the build, not supplied _by_ the
> > > > > build.
> > > > >
> > > > > The build shouldn't unconditionally overwrite the existing value of
> > > > > this variable with one it makes up. It has no idea what I called my
> > > > > cross compiler.
> > > >
> > > > The build does not unconditionally overwrite the existing value of this
> > > > variable. You can specify the name of your cross compiler like this:
> > > >
> > > > make CROSS_COMPILE=m68k-linux-
> > > >
> > > > BTW, m68k-linux-gnu- is the default name for a m68k cross compiler.
> > >
> > > For "make headers_install" this is not good.
> > > But I see there is confliting usages here.
> > > 1) current functionality makes it easy to build a cross compiled m68k
> > >
> > > Btw. if you did:
> > > CROSS_COMPILE ?= m68k-linux-
> > >
> > > then I could do:
> > > export CROSS_COMPILE=my-m68k-linux-
> > > make
> > >
> > > and still get the expected result.
> >
> > That won't work, cfr. http://lkml.org/lkml/2007/5/6/58.
>
> Reading the patch in that link, recent cross compilers from _where_?
> Buildroot? Cross-tools? Gentoo embedded? Cross Linux From Scratch? My
> Firmware Linux project?
>
> You assume they all use the same name, yet your patch changes them from one
> default name to another default name, presumably due to a gcc version change
> becoming increasingly political about the GNU/Linux/Dammit thing...

Compilers build from the only remaining distribution that supports (sort
of) m68k: Debian.

> None of the other targets I've tried attempt to _supply_ a default. Just like
Obviously you haven't tried them all...

> the Linux kernel errors out early in the build if you distclean and then try
> to run "make" without having run config first. It doesn't run "defconfig"
> for you and continue on in that case. But m68k, uniquely, assumes it knows
> what you want to do when you didn't tell it. Other targets do not do this.

If you cross compile for m68k and don't specify a toolchain, you get a
default one: the one the m68k developers use.

On some other architectures, you always have to specify the toolchain.
What's wrong with providing a default?

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-10-11 17:15    [W:0.056 / U:2.616 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site