Andreas Enge <andr...@enge.fr> writes: > On Tue, Feb 17, 2015 at 10:46:11PM -0500, Mark H Weaver wrote: >> Strangely, this update broke python-urwid-1.3.0.x86_64-linux. Three >> tests involving newlines broke: > > Even more strangely, it builds without problems on my machine. > > I wonder if something is wrong with the hydra build machine setup, or if > we still have some kind of impurity in the build system.
The most notable impurity is the kernel. Also, on several platforms, including ARM, config.guess looks at 'uname -m' to find out the specific processor type in the build machine to decide what triplet to use. That's why I advocated passing --build= to configure by default for all builds here: https://lists.gnu.org/archive/html/guix-devel/2015-01/msg00037.html However, there was pushback and the discussion stalled. Even if we pass --build= to bypass config.guess, some packages probe the details of the build machine and/or kernel and specialize the build for those. In theory, we could perform all builds within a VM and include the VM build+configuration and kernel in the hash computation, but that would obviously increase the resources needed to build things quite a lot. Mark
