Re: Project builds fine on i686 but warnings and a compilation error show up on x86_64

[Juan A. Rubio]

Hi Eric,

Thanks for your reply.

You are absolutely right, these were all (fairly obvious) portability bugs
in my code (as also pointed by others). Warnings were all related to the
pointer size and I got the compile error while assigning a va_list to
another (
http://www.gnu.org/software/autoconf/manual/autoconf.html#Function-Portability).
I'm using va_copy to fix that one.

Thanks again,
Juan


On Mon, Jun 11, 2012 at 2:06 PM, Eric Blake <address@hidden> wrote:

> On 06/10/2012 02:37 PM, Juan A. Rubio wrote:
> > Hi,
> >
> > I'm building a project of mine using autotools and I'm trying to figure
> out
> > a problem that recently came up. My project has been building correctly
> for
> > over a year under a number of i686 Ubuntu-based desktop platforms
> (various
> > ubuntu releases, 10.04 through to 12.04 on i686 desktops and laptops).
> >
> > Recently I've been trying to build the same project under a x86_64 Ubuntu
> > Server-based system, and under this system the build fails. In addition
> to
> > the build failure, I've noticed the following warning showing up a number
> > of times in different places during the compilation. This warning which
> > never shows up when building the same project on the i686 systems.
> >
> > warning: cast to pointer from integer of different size
> > [-Wint-to-pointer-cast]
>
> Most likely, this is a bug in your C code, and not in autoconf.  But
> without posting the actual code in question that triggers the warning,
> we can't read your mind to tell you how your code is non-portable, even
> if this were the right list.
>
> --
> Eric Blake   address@hidden    +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
>
>