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

[William Harrington]

Hello everybody,

     I have time now and I'm working on what was discussed in the irc  
channel a couple/few months ago about having a multilib toolchain, but  
having it default to building 32bit user space instead of 64bit user  
space.

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