[PATCH] Support cross linking from x86-64 to arm on ubuntu

[Rafael Espíndola]

On 29 October 2013 06:35, Chandler Carruth <chandlerc at gmail.com> wrote:
> For the list, Rafael and I spent a bunch of time talking about this in IRC
> as well, and it took me some time to debug down to the actual root cause. I
> think I found it and fixed it with the surgical change in r193601. I added
> back all of the tests from your patch Rafael, but if you think we need
> further testing here, by all means.
>
> We're still going to consider *more* directories than GCC would. That's true
> for almost all of these though. However, as far as I can tell, the added
> places we search are duplicates, and thus either actually harmless, or
> unlikely to be problematic ordering changes (looking in /lib after /usr/lib
> rather than before /usr/lib when we think the actual libraries are in
> /usr/<triple>/lib).
>
> This problem isn't new or specific to the ubuntu config. I'd love ways to
> solve it, but historically when I've tried either the complexity sky
> rocketed or we stopped matching GCC's behavior if you moved the GCC
> installation to a different install prefix or otherwise changed things in
> small ways. =/
>
> Anyways, let me know if my patch makes sense and if there is stuff still not
> working.

I replied to your commit. Lets keep it there for one thread.

>
> On Mon, Oct 28, 2013 at 7:39 PM, Rafael Ávila de Espíndola
> <rafael.espindola at gmail.com> wrote:
>>
>>   rebased.
>>
>> Hi chandlerc, logan,
>>
>> http://llvm-reviews.chandlerc.com/D2045
>>
>> CHANGE SINCE LAST DIFF
>>   http://llvm-reviews.chandlerc.com/D2045?vs=5214&id=5216#toc
>>
>> Files:
>>   lib/Driver/ToolChains.cpp
>>   lib/Driver/ToolChains.h
>>   test/Driver/Inputs/fedora_18_tree/etc/redhat-release
>>   test/Driver/Inputs/x86-64_ubuntu_13.10/etc/debian_version
>>   test/Driver/Inputs/x86-64_ubuntu_13.10/lib/.keep
>>   test/Driver/Inputs/x86-64_ubuntu_13.10/usr/arm-linux-gnueabi/lib/crt1.o
>>   test/Driver/Inputs/x86-64_ubuntu_13.10/usr/arm-linux-gnueabi/lib/crti.o
>>   test/Driver/Inputs/x86-64_ubuntu_13.10/usr/arm-linux-gnueabi/lib/crtn.o
>>
>> test/Driver/Inputs/x86-64_ubuntu_13.10/usr/arm-linux-gnueabihf/lib/crt1.o
>>
>> test/Driver/Inputs/x86-64_ubuntu_13.10/usr/arm-linux-gnueabihf/lib/crti.o
>>
>> test/Driver/Inputs/x86-64_ubuntu_13.10/usr/arm-linux-gnueabihf/lib/crtn.o
>>
>> test/Driver/Inputs/x86-64_ubuntu_13.10/usr/lib/gcc-cross/arm-linux-gnueabi/4.7/crtbegin.o
>>
>> test/Driver/Inputs/x86-64_ubuntu_13.10/usr/lib/gcc-cross/arm-linux-gnueabi/4.7/crtend.o
>>
>> test/Driver/Inputs/x86-64_ubuntu_13.10/usr/lib/gcc-cross/arm-linux-gnueabihf/4.8/crtbegin.o
>>
>> test/Driver/Inputs/x86-64_ubuntu_13.10/usr/lib/gcc-cross/arm-linux-gnueabihf/4.8/crtend.o
>>   test/Driver/linux-ld.c
>>
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>