Re: cross-compiling on 64 to 32-bit Linux

[Bob Friesenhahn]

On Sun, 24 May 2009, Jan Engelhardt wrote:
> Bruno wrote:
> > The -m64 flag is the default on bi-arch Linux systems.
>
> -m64 is the default on where it has been configured so. Just because
> your shiny x86_64 install does that, does not mean it is universal.
> Oftentimes RISCs, and sparc64 is usually one of these, defaults to
> defaulting to 32, because 64 is slower there. Of course you can
> compile a gcc that defaults to 64.

I have not noticed that PowerPC or SPARC 64 bit code is slower or 
faster than 32 bit code.  I have noticed that some older or poorly 
maintained applications (e.g. Perl) sometimes don't work as 64-bit 
code.

Compiler defaults are simply a matter of policy which is up to the GCC 
maintainers, the individual Linux distribution, or even the person who 
installs GCC, to determine.

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