[Clfs-dev] powerpc64 and sparc64 discussion for 32 bit user space and multilib

[William Harrington]

On Dec 17, 2008, at 8:11 AM, Ken Moffat wrote:

> On Tue, Dec 16, 2008 at 07:39:49PM -0600, William Harrington wrote:
>>
>> So far I have not been able to get gcc to build 32 bit by default.
>> I've attempted editing gcc/config/rs6000/linux64.h and editing the
>> specs file dumped by /tools/bin/gcc and changing defaults, however,  
>> it
>> isn't helping any.
>>
>> I figured it'd be easy to just change the specs so that
>> multilib_default was m32 and that if m64 or m32 wasn't given it'd use
>> the 32 bit code.
>>
>> Same with changing MULTILIB_DEFAULTS in linux64.h to m32.
>> Perhaps ASM_DEFAULT_SPEC neeed changing to so I changed to so if m32
>> wasn't given it'd use 32. It's normally set that if m64 isn't given
>> it'll use 64 bit code.
>>
>> Most of the lists I run across where people are wanting 32 bit by
>> default, they suggest using a wrapper script.
>>
>> Any ideas?
>>
>> -William
> Take a look at fedora ?  I've never attempted to understand all of
> what they do for ppc64.  You could start at
> http://cvs.fedoraproject.org/viewvc/rpms/gcc/F-10/
>
> The main thing is the specfile (gcc43.spec) which contains an
> *enormous* amount of things, but particularly the chunk which starts
>
> %ifarch sparcv9 ppc
> ln -sf ../../../../../lib64/libobjc.so.2 64/libobjc.so
>
> (I tried pasting it, but the long lines get broken)
>
> I also note they create a gcc64 wrapper early in the process.
>
> ĸen

Thanks for the input, Ken. Time to continue the project! It's a winter  
wonderland out, cold out, and I'm stuck inside with laserdiscs and  
E420R fan noise.

-William