Re: multiarch procedure

[Bob Friesenhahn]

On Fri, 9 May 2008, Steve Edwards wrote:
> I've been using libtool quite happily for some time but have just 
> started looking at packaging libraries for x86_64 systems. I'm 
> trying to find out what the recommended method is for installation 
> of x86_64 64bit libraries.

Different systems use different approaches.

> Is the only method to manually set --libdir at configure time (I 
> have libtool integrated with automake/autoconf)? I was a little

The only way to be sure that things will work is to use --prefix and 
install into a different directory tree.  If you advise to use 
--libdir, then you still have the interface header files to worry 
about.  Interface header files often have different definitions for 32 
and 64 bits.

> I had a run through the libtool info at work and I'm sure I found a 
> tantalising reference to multiarch (with a comment along the lines 
> of "unless you know what this is you don't need it") but I certainly 
> can't find anything on my home system (libtool 2.2.4)

Libtool 2.2.X includes support for automatically using 64-bit 
libraries on various popular systems (e.g. Solaris, Linux). 
Otherwise 64-bit builds would fail on systems which default to a 32 
bit ABI.  It does not include multiarch/multilib support necessary to 
build 32 and 64 bit libraries and install into that footprint.

Bob
======================================
Bob Friesenhahn
address@hidden, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/