Re: Multilib problem

[Danny Gale <Daniel.Gale@coloradoengineeringinc.com>]

Cody, All:

Unfortunately, after your patch, the same problem persists. Have you 
been able to look at this at all since?

Thanks,
Danny

On 01/24/2014 03:35 PM, Cody P Schafer wrote:
> 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 
>
>


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