- ghc-devs - Haskell.org

Re: Which stable GHC release is expected to have support for linear types?
by Edvard Hübinette 15 Jul '17

15 Jul '17

Hi Wolfgang, I've put together a small README for getting this up and running (both for using stack with pre-built Docker images, and from source). It can be found in the repository here: https://github.com/tweag/ghc/tree/linear-types. Hope this will help! Cheers, Edvard Hübinette

7 21

GHCi tests hanging on Mac
by Richard Eisenberg 14 Jul '17

14 Jul '17

Hi devs, Some GHCi tests (but far from all!) hang on my Mac. I can't reproduce this behavior outside the testsuite driver, so I think it's the Python code, not the Haskell. Failing tests: ghci/prog017/prog017 ghci/scripts/T6018ghcifail ghci/scripts/T6018ghcirnfail And that's it! My Python reports that it's 2.7.13. Any leads to follow? Thanks, Richard

2 1

Trac down for a bit
by Ben Gamari 12 Jul '17

12 Jul '17

Hello everyone, Sorry for the interruption but Trac is having some trouble at the moment. I'm actively working on restoring service and will let you know when things are back to normal. Cheers, - Ben

1 1

Building GHC reference manual?
by Iavor Diatchki 11 Jul '17

11 Jul '17

Hello, is it possible to build just the HTML for the GHC reference manual, without building the whole of GHC, and if so how do I do it? -Iavor

3 2

Simon's (lack of) input
by Simon Peyton Jones 11 Jul '17

11 Jul '17

Friends My GHC inbox has grown to alarming proportions. I try to keep abreast of tickets where I think I have something substantial contribute, and generally succeed, but I've been failing badly in the last few weeks because of a storm of other commitments. I'll get back to it, but probably not before my summer holiday 3-17 August. Meanwhile if you are stalled awaiting input from me, please feel free to ping me about it. Simon

1 0

[ANNOUNCE] GHC 8.2.1 release candidate 3 available
by Ben Gamari 10 Jul '17

10 Jul '17

Hello everyone, I am pleased to at long last announce the third (and almost certainly last) release candidate of GHC 8.2.1. Binary and source distributions can be found at, https://downloads.haskell.org/~ghc/8.2.1-rc3/ This release candidate fixes a number of regressions from 8.0.2 found in -rc2, as well as a major correctness bug (#13615) present in several previous GHC major releases. Users taking advantage of parallelism in their programs will be strongly encouraged to upgrade to 8.2.1 once it is released. Among the other issues resolved in this candidate are, * Functionality allowing GHC to automatically use the ld.gold linker when available (see #13541). Not only has there recently been significant user demand for this feature, but this also serves to work around a performance bug in BFD ld affecting GHC 8.2 (#13739) * A regression resulting in the package cache file to be out-of-date after binary distribution installation (#13375) * Numerous type-checker bugs (#13625, #1370, #13782, #13871, #13594, #13879, #13881, #13875) * A bug wherein a thread blocked on a BLACKHOLE may not be woken up (#13751) * and many more... There are a few changes in release-engineering matters that should be mentioned, * Binary distributions for CentOS 6.7 have been dropped due to the release of CentOS 7.0 which can use Debian 8 binaries. If you would like us to continue to produce CentOS 6.7 bindists please let me know. * GHC HQ now also provides FreeBSD and OpenBSD distributions for amd64; this will allow us to more quickly ship distributions to users by eliminating the need for a long lag time between source release availability and having all binary distributions available. * There is a technology-preview of an AArch64 Linux binary distribution, as well as an ARM Linux build (although the latter won't be uploaded until a few hours from now). AArch64 support is quite preliminary but should be stable in 8.4 thanks to further linker fixes by Moritz Angerman. ARM should be stable. As always, let us know if you encounter problems. If all goes well we will hopefully have a final 8.2.1 release in the next two weeks. Finally, thanks for your patience during this admittedly quite drawn out release cycle. While it has been long, we are confident that the result will be worth the wait. Moreover, we have been steadily working on infrastructure which should shrink future release cycles and give us better testing between releases. More details on this coming soon. Happy testing, - Ben

3 3

can't validate on Linux
by Richard Eisenberg 09 Jul '17

09 Jul '17

Hi devs, When I try validating my patch, validation fails with > ... > Registering library for ghc-prim-0.5.0.0.. > ghc-cabal: '/home/rae/ghc/ghc-valid/bindisttest/install > dir/lib/ghc-8.3.20170312/bin/ghc-pkg' exited with an error: > ghc-pkg: Couldn't open database /home/rae/ghc/ghc-valid/bindisttest/install > dir/lib/ghc-8.3.20170312/package.conf.d for modification: {handle: > /home/rae/ghc/ghc-valid/bindisttest/install > dir/lib/ghc-8.3.20170312/package.conf.d/package.cache.lock}: hLock: invalid > argument (Bad file descriptor) > make[3]: *** [ghc.mk:990: install_packages] Error 1 > make[2]: *** [Makefile:51: install] Error 2 > make[1]: *** [bindisttest/ghc.mk:33: test_bindist] Error 2 > make: *** [Makefile:127: test_bindist] Error 2 Any advice? Thanks! Richard

5 7

Re: Compilation time
by Ryan Scott 08 Jul '17

08 Jul '17

Another things to note about 8.2 build times is that a bulk of the time is probably being spent during the linking phase. This is because GHC 8.2 has switched over to split-sections by default, but unfortunately, old versions of the BFD linker take a long time to link code that uses split-sections (see the discussion at [1]). There is ongoing work (which should hopefully land before the final 8.2 release) to use gold instead of BFD as the default linker when available, which will reduce linking times dramatically. Ryan S. ----- [1] https://ghc.haskell.org/trac/ghc/ticket/13739

5 6

Listing Trac keywords
by Ben Gamari 06 Jul '17

06 Jul '17

Hello everyone, Today I took a few minutes to write some SQL to generate a list of all of the keywords in Trac tickets. There are still a few quirks (e.g. no hyperlinking of ticket numbers, some mysterious duplicate ticket numbers). Nevertheless, it's better than nothing. The result can be found here [1]. Cheers, - Ben [1] https://ghc.haskell.org/trac/ghc/report/25?sort=n_tickets&asc=0&page=1

1 0

Updating Phabricator
by Ben Gamari 06 Jul '17

06 Jul '17

I'll be upgrading Phabricator in a few minutes. I expect this will only take 30 minutes or so and will let you know when it's done. Cheers, - Ben

1 1