Am Mittwoch, 21. Juni 2017, 16:01:31 CEST schrieb to...@tuxteam.de:
Hi Tomas,
thanks for this quick response. Well, I just do not want to compile something
(however, I believe, some binary packages do this at installing, don't they?),
just unpack packages to a chroot.
But you may be right: The live-build scripts and the packages might interact
with the base structure. And this will give bad answers. I did not think of
this. So I understand: Bad idea! :)
Thanks again for the fast response. It makes things much clearer.
Best
Hans
> All this is subsumed under the moniker "cross build". And the short
> answer is that yes, in principle it is possible (a decent C compiler,
> for example, supports cross compiling, etc.).
>
> In practice, though, things become... "interesting". For example,
> what do you do if your build's "configure" interrogates your
> system? Your system will give the wrong answers! So the build
> system has to offer a way to provide pre-packaged answers ("yes,
> this is an ARM with a hardware floating point unit" or whatever,
> instead of the more comfortable "go find out for yourself").
>
> And then, when the thing is built and you say "make test"? Do
> you have an emulator around?
>
> To get you started on how Debian tries to tackle that, see
>
> https://wiki.debian.org/CrossBuildPackagingGuidelines
>
> So the answer is... for some packages it works, for some not. It
> depends among other things on the build system.
>
> Cheers
> -- tomás
