On Mon, 12 Oct 2020 at 12:34, Ricardo Wurmus <[email protected]> wrote:
> > Does the parallel build save a lot of time and CPU? If yes, maybe we > > could to provide a transformation for the expert, something like > > "haskell-build-system-with-parellel-build" which tweaks > > "PARALLEL-BUILD?", similarly to the recent "no tests". WDYT? > > We shouldn’t compromise reproducibility for parallel builds. Ideally we > would figure out what exactly causes the differences and fix that > instead of disabling parallel builds, but if that turns out to be too > difficult I think we should just revert this until we have a good fix. > > Perhaps something can be done by fixing the order of files somewhere. My proposal is for the expert and not at the CLI level. Something like "(funky-name ghc-foo)" which returns a new package with PARALLEL-BUILD? turned to #t. And the default should be #f. WDYT? Well, I am going to try to rebuild the packages with #f and see if it fixes the ~300 unreproducible packages. Cheers, simon
