C++ compilers on Linux supporting 64bit architecture?

[Matthew Saltzman]

On Sat, 2007-09-01 at 13:49 +0200, Bo Berglund wrote:
> On Sat, 01 Sep 2007 05:23:18 -0600, Karl Larsen <k5di at zianet.com>
> wrote:
> 
> >Bo Berglund wrote:
> >> 1) Is it possible to cross-compile on Linux 32 bit to produce an
> >> executable for the 64bit architecture Linux as well as 32 bit?
> >>
> >>   
> >    In Linux Bo, if you want to write in 64 bit you load the version of 
> >Fedora 7 that is totally 64 bit. This is the f7 x86-64 distribution and 
> >different than Microsoft, you can download this free. Then you can 
> >compile in C or C++ with 64 bit. No need to cross/compile.
> >
> 
> Yes, I understand that in 64bit Linux you would be able to compile for
> the 64bit platform....
> But our development machines are mostly (95%) Windows 32bit systems
> and I had in mind to use VirtualPC in order to have the developers
> running Linux on their own Windows machines for compiles etc.
> Then we would use a single hardware Linux machine for actual testing.
> 
> Unfortunately VirtualPC2007 does not support loading anything else
> than 32 bit operating systems into a virtual machine, so we are left
> with that. We use VPC2007 a lot for testing purposes, so we are
> comfortable with that system except for the 64bit support (or lack
> thereof).

On 32-bit F7:

        $ gcc -m64 foo.c
        foo.c:1: sorry, unimplemented: 64-bit mode not compiled in

So the distribution compilers can't do it.  It may (should) be possible,
but you'll probably have to build your own gcc from source.

> 
> Bo Berglund
> 
> 
-- 
                Matthew Saltzman

Clemson University Math Sciences
mjs AT clemson DOT edu
http://www.math.clemson.edu/~mjs