Re: Multilib problem

[Cody P Schafer <dev at codyps dot com>]

On 01/24/2014 02:28 PM, Cody P Schafer wrote:
> On 01/23/2014 02:37 PM, Danny Gale wrote:
> > Hi all,
> >
> > I've successfully compiled my powerpc64-e6500-linux-gnu toolchain!
> > Hooray! :)
> >
> > Now, the trouble is that U-Boot doesn't support 64-bit powerpc builds,
> > so the toolchain needs to have multilib enabled. The compiler itself is
> > built with no problem, but during the "Building for multilib
> > subdir='32'" step, the build fails with this error:
>
> The problem with multilib on powerpc (and x86, and possibly others) is
> that glibc (and probably other libcs) use the target to determine which
> api to build for the arch. To explain: powerpc64-e6500-linux-gnu passed
> to glibc's configure will always try to build a 64bit libc. One needs to
> pass powerpc-e6500-linux-gnu and then override the place to find CC,LD,
> and the like as well as the result directory. The only crossbuild tool I
> know of that actually is able to do this is gentoo's "crossdev". I've
> been working on some patches to try to get similar functionality in
> crosstool-ng, but they're nowhere near ready
> (https://bitbucket.org/jmesmon/crosstool-ng-pq/ is my patchqueue which
> includes them).

Direct link to the interesting (but untested) patch:
https://bitbucket.org/jmesmon/crosstool-ng-pq/src/1fde229c1e3b036dcd8d58cd3cc40a889ad7486b/multilib-libc-fixup.patch?at=default

And this is what crossdev uses to do it's heavy lifting w.r.t. multilib:
http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/eclass/multilib.eclass?revision=1.105&view=markup

--
For unsubscribe information see http://sourceware.org/lists.html#faq