Arie Middelkoop wrote:
Eelco Dolstra wrote:
(Undoubtedly Gentoo people regularly build packages with specific -j
flags, so they probably know how much breakage it causes...)
I'm a Gentoo user who updates frequently from the official portage tree,
using -j 3. I never noticed make problems due to race conditions,
although I'm not sure if I would be able to recognize one.
There are a lot of breakages you won't notice when using Gentoo, because
specific packages filter certain common flags that are known to cause
breakage in that package (for example, -O3, make -j ...) so they
silently work without using your exact flags. (Which is very convenient
as a gentoo user... which I was a few years ago)
On the other hand, (just having read dolstra-thesis.pdf), I think it
would be interesting to see how much breakage it tends to cause. Sure,
it's nearly impossible in general to prevent builds from being
nondeterministic -- but can't we observe whether particular packages
tend to compile the same way every time (to the exact same NAR/hash),
which lets us do all kinds of interesting comparisons? Probably, making
GCC's __DATE__ etc. not return the actual date, would accomplish that
for most packages? Has this been investigated at all? (Does current
Nix use the intensional or extensional model?)
-Isaac
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