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September 2020

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[ANNOUNCE] Glasgow Haskell Compiler 9.0.1-alpha1 released
by Ben Gamari 06 Dec '20

06 Dec '20

Hello all, The GHC team is very pleased to announce the availability of the first alpha release in the GHC 9.0 series. Source and binary distributions are available at the usual place: https://downloads.haskell.org/ghc/9.0.1-alpha1/ This first alpha comes quite a bit later than expected. However, we have done a significant amount of testing on this pre-release and therefore hope to be able to move forward quickly with a release candidate next week and with a final release in mid-October. GHC 9.0.1 will bring a number of new features: * A first cut of the new LinearTypes language extension [1], allowing use of linear function syntax and linear record fields. * A new bignum library (ghc-bignum), allowing GHC to be more easily used with integer libraries other than GMP. * Improvements in code generation, resulting in considerable performance improvements in some programs. * Improvements in pattern-match checking, allowing more precise detection of redundant cases and reduced compilation time. * Implementation of the "simplified subsumption" proposal [2] simplifying the type system and paving the way for QuickLook impredicativity in GHC 9.2. * Implementation of the QualifiedDo extension [3], allowing more convenient overloading of `do` syntax. * Improvements in compilation time. And many more. See the release notes [4] for a full accounting of the changes in this release. Do note that there are a few things that we expect will change before the final release: * We expect to sort out a notarization workflow for Apple Darwin, allowing our binary distributions to be used on macOS Catalina without hassle. Until this has been sorted out Catalina users can exempt the current macOS binary distribution from the notarization requirement themselves by running `xattr -cr .` on the unpacked tree before running `make install`. * We will likely transition the Alpine binary distribution to be fully statically-linked, providing a convenient, distribution-independent packaging option for Linux users. * We will be merging a robust solution for #17760 which will introduce a new primitive, `keepAlive#`, to the `base` library, subsuming most uses of `touch#`. As always, do test this release and open tickets for whatever issues you encounter. To help with this, we will be publishing a blog post describing use of our new `head.hackage` infrastructure to ease testing of larger projects with Hackage dependencies later this week. Cheers, - Ben [1] https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0111-l… [2] https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0287-s… [3] https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0216-q… [4] https://downloads.haskell.org/ghc/9.0.1-alpha1/docs/html/users_guide/9.0.1-…

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Exchange "ar" prefix in ghc build
by Marius Melzer 14 Sep '20

14 Sep '20

Hi, I'm trying to add L4Re as a new OS to GHC and I'm already struggling a bit with the setup. I added l4re to a few places that seem to make sense (in aclocal.m4:296/2165, in config.sub:1371, in compiler/GHC/Platform.hs:132 and in libraries/ghc-boot/GHC/Platform/ArchOS.hs:99/156). Now I wanted to try to build it to see where it fails to continue, but I'm failing on the configure step, I have so far: ./configure --target=aarch64-unknown-l4re CC=aarch64-linux-gnu-gcc Which fails when it looks for ar (with the prefix aarch64-unknown-l4re instead of aarch64-linux-gnu): checking for aarch64-unknown-l4re-ar... no configure: error: cannot find ar in your PATH, no idea how to make a library Can I somehow tell configure to use the aarch64-linux-gnu prefix for ALL tools (nm, ar, gcc, etc.) even though I build for aarch64-unknown-l4re? Or if not, is there a way to set the ar tool in the same way as I did for gcc with CC=...? Thanks in advance, Marius

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