[ubuntu-za] Compiling code between versions

Nic Roets nroets at gmail.com
Sun Mar 6 22:16:46 UTC 2011

Hello Charl,

I doubt that it is the kernel. It could be a bug in one of the
libraries you are linking against, but if you manage to narrow it
down, I doubt that the developers of that library will give the issue
any serious attention. If you tell us what you are linking against, I
can speculate more broadly.

Providing backward compatibility is more important (running 10.4 apps
on 10.10). But even this is not guaranteed. For example gpsd (one of
the "main" daemons) recently changed protocols as well as clientside
API without providing backward compatibility.

If you want to ensure maximum compatibility, you can either link
statically, or you could run 'ldd' on your executable to find out
exact what .so files you app depends on.

On Sun, Mar 6, 2011 at 9:43 PM, Charl Wentzel
<charl.wentzel at vodamail.co.za> wrote:
> Hi guys
> I've always managed to compile source code on one version of Ubuntu and then
> simply copy the executable across to and older version of Ubuntu and run it
> without issues.  This no longer seems to be the case.
> I compiled to program on 10.10 (desktop running on my laptop) for
> development environment running 10.04.2 (server edition).  Both are 32-bit
> editions.  However, for some reason I now get and "Illegal Instruction".  I
> traced the point of failure using remote debugging, but found no obvious
> reason for the failure.  The executable also runs fine on my laptop.
> I finally managed to get a the executable running once I compiled it on the
> target platform directly.  I suspect it is related to the different kernels.
> Is there a significant change between 10.04 and 10.10 that could cause this?
> Regards
> Charl
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