Re: Going back to 32 bit from 64 bit

["Jarod Wilson" <user=74@nabble.blu.org>]

 On Tuesday 16 October 2007 02:25:59 pm Kristian Erik Hermansen wrote: 
> I think you are mistaken.  I have built plenty of both 32-bit and 
> 64-bit binaries on Ubuntu.  They offer both lib32 and lib64 
> directories.  Again, there is no need for a chroot... 

Huh. Perhaps I'm getting confused with the early days of 64-bit Debian. 
Honestly, I haven't followed any distributions outside of those built inside 
our own walls in the last year or so... If what you say is true (and I assume 
it is), then what exactly are the remaining problems with multi-arch support 
on Ubuntu? 




> On 10/16/07, Jarod Wilson <[hidden email]> wrote: 
> > On Oct 16, 2007, at 11:38, Jerry Feldman wrote: 
> > > On Tue, 16 Oct 2007 09:52:56 -0400 
> > > 
> > > Jarod Wilson <[hidden email]> wrote: 
> > >> A very important distinction to make here: some distributions 
> > >> (including Fedora) have gone to great lengths to try to sanely 
> > >> support multi-arch (mixing of 64-bit and 32-bit applications/ 
> > >> libraries/etc), while others (including Ubuntu) simply punted and 
> > >> require you to set up a chroot to run anything 32-bit on top of a 64- 
> > >> bit environment. Thus its possible to run pretty much any 32-bit 
> > >> userspace application on a 64-bit Fedora install with minimal effort. 
> > > 
> > > Hi Jarod, 
> > > I was wondering if you could elaborate a bit more on this. As I have a 
> > > few 32-bit things running on Ubuntu 64. Certainly one of the things 
> > > you 
> > > need is to have both the 32-bit as well as 64-bit libraries. As I 
> > > documented, this morning I installed wine, which is a 32-bit 
> > > executable. 
> > 
> > As I now understand it, there's actually a ia32-libs package or some 
> > such thing that provides a few essential 32-bit libs for 64-bit 
> > Ubuntu systems, so my blanket statement about requiring a chroot for 
> > anything 32-bit wasn't quite right. However, outside of the scope of 
> > binaries that are built to use those compat libs, 32-bit apps on a 64- 
> > bit Ubuntu system require a 32-bit chroot, as the bulk of 32-bit and 
> > 64-bit libraries are identically named and placed in identical paths 
> > on the file system (typically, /usr/lib/libfoo.so.1). What Fedora 
> > opted to do was put all 64-bit libraries in a different path (/usr/ 
> > lib64/libfoo.so.1), which allows concurrent installation of both the 
> > 32-bit and 64-bit varieties of the very same libraries, and the 32- 
> > bit libraries you install are laid down by the exact same packages 
> > you'd install on a pure 32-bit system. 
> > 
> > 
> > -- 
> > Jarod Wilson 
> > [hidden email]