July 2015 - Glasgow-haskell-users

Discovery of source dependencies without --make
by Lars Hupel 13 Dec '15

13 Dec '15

(cross-posted from [haskell-cafe]) Hi, I've got a problem in our – admittedly complex – build process. We're running an automated grading system for student-submitted homework exercises. The compilation proceeds in stages: 1) Compile a library file, marked as trustworthy 2) Compile student submissions using Safe Haskell, able to access a whitelisted set of packages and the previously compiled library files 3) Compile the test suite 4) Link everything together into an executable The invocation is similar to this: ghc -c -outputdir "$OUT" -XTrustworthy Library.hs ghc -c -outputdir "$OUT" -i"$OUT" -XSafe "$SUBMISSION" ghc -c -outputdir "$OUT" -i"$OUT" Test_Suite.hs ghc -outputdir "$OUT" -i"$OUT" -o "$OUT/runner" The second stage works well under the assumption that there's just one single submitted file. If there's more than one, I need to specify them in topological order wrt their module dependencies. Consider two simple modules: A.hs > module A where > > import B > import Library B.hs > module B where Invoking GHC with "A.hs" "B.hs" will fail: A.hs:3:1: Failed to load interface for ‘B’ My naive attempt at solving that problem was to just insert "--make" into the compiler flags. No luck, because according to [1, §4.7.3], "--make" will only look at source files and will ignore the "Library.hi" file from the previous compilation stage. If I give the path to "Library.hs" as well, GHC insists on recompiling it with changed flags ("-XSafe" instead of "-XTrustworthy"). Reading a bit further, I discovered the '-M' flag, however, not only does it output Makefile-formatted output, it also ignores .hi files. Is there any way to get the dependency discovery of '--make' without the rest? I know I could probably make it work if I made a package out of the first build stage, but I really want to avoid that in order to not increase the build complexity even further. Cheers Lars [1] <https://downloads.haskell.org/~ghc/7.6.3/docs/html/users_guide/separate-com…>

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simultaneous ghc versions
by Evan Laforge 03 Aug '15

03 Aug '15

The recent release of ghc 7.10.2 reminded me of something I meant to ask about a long time ago. Most of the binaries ghc installs are versioned (x linked to x-7.10.2), with some exceptions (hpc and hsc2hs). Shouldn't they all be versioned? Also, 'haddock' is inconsistent with all the rest, in that it's haddock linked to haddock-ghc-7.10.2. I've long used a few shell scripts (recently upgraded to python) to manage ghc installs. A 'set' which creates symlinks to make a particular version current, and an 'rm' to remove all traces of a version. But due to the inconsistency, I have to remember to run "fix" first, which moves the unversioned binaries to versioned names. As an aside, I have three scripts I use all the time: set version, remove version, and remove library. Come to think of it, shouldn't ghc include this, instead of everyone creating their own shell scripts by hand?

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Re: [Haskell-cafe] ANNOUNCE: GHC version 7.10.2
by Ben Gamari 30 Jul '15

30 Jul '15

James M <jmartin(a)eecs.berkeley.edu> writes: > There was talk from an earlier email thread of releasing the Haskell > Platform at the same time as 7.10.2. > > I am referring to the weekly news of 2015/05/11: > https://ghc.haskell.org/trac/ghc/blog/weekly20150511 > > and this email thread: > https://mail.haskell.org/pipermail/ghc-devs/2015-May/008911.html > > > Was this plan abandoned? Or was there something unexpected that is delaying > it? > Not at all! There ended up being a bit of timing skew between the Platform and GHC releases but an approximately concurrent release is still the plan. The Platform folks are hard at work as we speak, in the final stages of pushing out their release. I expect it will be announced shortly. Unfortunately due to the late notice of the text issue, the initial release will ship with text-1.2.1.1, which is still affected by the rewrite issue. That being said, the impact of this issue is mostly on compile time, in most cases you shouldn't see much impact on runtime performance. Moreover, they will be working to push out another release with text-1.2.1.3 in the coming days. Cheers, - Ben

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Re: [Haskell-cafe] ANNOUNCE: GHC version 7.10.2
by Brandon Allbery 30 Jul '15

30 Jul '15

On Thu, Jul 30, 2015 at 12:52 PM, James M <jmartin(a)eecs.berkeley.edu> wrote: > There was talk from an earlier email thread of releasing the Haskell > Platform at the same time as 7.10.2. I think the right place to ask this is libraries(a)haskell.org. I would imagine they're in final testing and/or getting release packages in place. (Note as previously mentioned that "text" was just updated, and the Platform needs that; this presumably means they had to start over making release packages.) -- brandon s allbery kf8nh sine nomine associates allbery.b(a)gmail.com ballbery(a)sinenomine.net unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net

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ANNOUNCE: GHC version 7.10.2
by Ben Gamari 30 Jul '15

30 Jul '15

===================================================================== The (Interactive) Glasgow Haskell Compiler -- version 7.10.2 ===================================================================== The GHC Team is pleased to announce a new bug-fix release of GHC, 7.10.2. There have been a number of significant bug fixes since the 7.10.1 (with over 70 defects fixed). These include fixes affecting type-checker correctness, runtime stability, and compiler performance. For this reason we highly recommend that users of 7.10.1 upgrade quickly. Note that due to changes made in this release to GHC's optimizer, previously fragile-but-working rewrite rules may fail to fire. One example of this was found in the widely-used `text` package late in the release cycle, which manifested in long compilation times and poor code generation for `Text` literals (see [Trac #10528]). Users are advised to use text >=1.2.1.2 which includes more robust rewrite rules. The full release notes including a complete listing of the changes in this release can be found here, https://downloads.haskell.org/~ghc/7.10.2/docs/html/users_guide/release-7-1… [Trac #10528]: https://ghc.haskell.org/trac/ghc/ticket/10528 How to get it ~~~~~~~~~~~~~ Both binary and source tarballs of GHC itself are available on the release download page, https://www.haskell.org/ghc/download_ghc_7_10_2 For a more smoother, better integrated experience users are encouraged to find a Haskell distribution. While these alternatives may not yet include 7.10.2, they offer tools and libraries to quickly get users up and running, as well as potentially better integration with the host operating system and package manager. See, https://www.haskell.org/downloads for more details. Background ~~~~~~~~~~ Haskell is a standard lazy functional programming language. GHC is a state-of-the-art programming suite for Haskell. Included is an optimising compiler generating good code for a variety of platforms, together with an interactive system for convenient, quick development. The distribution includes space and time profiling facilities, a large collection of libraries, and support for various language extensions, including concurrency, exceptions, and foreign language interfaces (C, whatever). GHC is distributed under a BSD-style open source license. A wide variety of Haskell related resources (tutorials, libraries, specifications, documentation, compilers, interpreters, references, contact information, links to research groups) are available from the Haskell home page (see below), https://www.haskell.org/ Supported Platforms ~~~~~~~~~~~~~~~~~~~ The list of platforms supported by GHC and the people responsible for them can be found here, https://ghc.haskell.org/trac/ghc/wiki/Platforms https://ghc.haskell.org/trac/ghc/wiki/CodeOwners Ports to other platforms are possible with varying degrees of difficulty. The Building Guide describes how to go about porting to a new platform: https://ghc.haskell.org/trac/ghc/wiki/Building Developers ~~~~~~~~~~ If you enjoy using GHC, you will likely also enjoy contributing to it! We are always looking for new contributors. Instructions on accessing our source code repository, and getting started with hacking on GHC, are available from the GHC developer site, https://ghc.haskell.org/trac/ghc/ Mailing lists ~~~~~~~~~~~~~ We run mailing lists for GHC users and bug reports; to subscribe, use the web interfaces at https://www.haskell.org/mailman/listinfo/glasgow-haskell-users https://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs There are several other haskell and ghc-related mailing lists on www.haskell.org; for the full list, see https://www.haskell.org/mailman/listinfo/ Some GHC developers hang out on #haskell on IRC, too: https://www.haskell.org/haskellwiki/IRC_channel Please report bugs using our bug tracking system. Instructions on reporting bugs can be found here: https://www.haskell.org/ghc/reportabug Hashes & Signatures ~~~~~~~~~~~~~~~~~ In https://downloads.haskell.org/~ghc/7.10.2/ you will find a signed copy of the SHA256 hashes for the tarballs, using my GPG key, Benjamin Gamari <ben(a)well-typed.com> Fingerprint: FFEB 7CE8 1E16 A36B 3E2D ED6F 2DE0 4D4E 97DB 64AD

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broken source link
by Christian Maeder 24 Jul '15

24 Jul '15

Hi, when trying to look up the original definition for Data.List.transpose in https://downloads.haskell.org/~ghc/latest/docs/html/libraries/Data-List.html I found that the source link https://downloads.haskell.org/~ghc/latest/docs/html/libraries/src/Data-OldL… does not work. Could this be fixed? Or should I look elsewhere for the sources? Cheers Christian P.S. my looking up transpose was inspired by https://mail.haskell.org/pipermail/haskell-prime/2015-March/003933.html

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GHC crashing in checkProddableBlock during linking
by Luke Iannini 24 Jul '15

24 Jul '15

Hi all, I'm encountering a crash in GHC 7.10.1 and 7.8.4 on Windows when I attempt to use Template Haskell in anything that relies on a package that contains C++; in my case, bindings to the Bullet physics engine. This is a pretty big blocker for me as I haven't found any good workarounds, so it would be awesome to get a fix in (I guess I just missed 7.10.2) I've made some progress here and a minimal reproduction if anyone can help: https://ghc.haskell.org/trac/ghc/ticket/10672 Cheers Luke

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ANNOUNCE: GHC 7.10.2 Release Candidate 2
by Austin Seipp 14 Jul '15

14 Jul '15

We are pleased to announce the first release candidate for GHC 7.10.2: https://downloads.haskell.org/~ghc/7.10.2-rc2 https://downloads.haskell.org/~ghc/7.10.2-rc2/docs/html/ This includes the source tarball and bindists for Windows, and Debian Linux. FreeBSD, OS X and Solaris binaries will follow soon. These binaries and tarballs have an accompanying SHA256SUMS file signed by my GPG key id (0x3B58D86F). We plan to make the 7.10.2 final release in a week or two - so please test as much as possible; bugs are much cheaper if we find them before the release! -- Regards, Austin Seipp, Haskell Consultant Well-Typed LLP, http://www.well-typed.com/

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Re: ANNOUNCE: GHC 7.10.2 Release Candidate 2
by Sven Panne 07 Jul '15

07 Jul '15

2015-07-07 7:26 GMT+02:00 Mark Lentczner <mark.lentczner(a)gmail.com>: > And now Windows RC2 for Haksell Platform is also here: > > http://www.ozonehouse.com/mark/platform/ > > [...] > I noticed 2 problems so far: * The package cache is still always out of date (I thought there was a fix for that): ---------------------------------------------------------------------- Sven@SCOTTY /d/Repositories/ObjectName (master) $ ghc-pkg list WARNING: cache is out of date: c:/Program Files/Haskell Platform/7.10.2\lib\package.conf.d\package.cache ghc will see an old view of this package db. Use 'ghc-pkg recache' to fix. c:/Program Files/Haskell Platform/7.10.2\lib\package.conf.d: Cabal-1.22.4.0 GLURaw-1.5.0.1 GLUT-2.7.0.1 [...] ---------------------------------------------------------------------- * Something is missing/misconfigured for Haddock (note the funny non-local path in the error message): ---------------------------------------------------------------------- Sven@SCOTTY /d/Repositories/ObjectName (master) $ cabal sandbox init Writing a default package environment file to d:\Repositories\ObjectName\cabal.sandbox.config Creating a new sandbox at D:\Repositories\ObjectName\.cabal-sandbox Sven@SCOTTY /d/Repositories/ObjectName (master) $ cabal configure Resolving dependencies... Configuring ObjectName-1.1.0.0... Sven@SCOTTY /d/Repositories/ObjectName (master) $ cabal haddock Running Haddock for ObjectName-1.1.0.0... Preprocessing library ObjectName-1.1.0.0... Haddock coverage: 100% ( 3 / 3) in 'Data.ObjectName' Haddock's resource directory (G:\GitHub\haddock\.cabal-sandbox\x86_64-windows-ghc-7.10.1.20150630\haddock-api-2.16.1) does not exist! ----------------------------------------------------------------------

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ANNOUNCE: GHC 7.10.2 Release Candidate 1
by Austin Seipp 04 Jul '15

04 Jul '15

We are pleased to announce the first release candidate for GHC 7.10.2: https://downloads.haskell.org/~ghc/7.10.2-rc1 https://downloads.haskell.org/~ghc/7.10.2-rc1/docs/html/ This includes the source tarball and bindists for Windows, Mac OS X, and Debian Linux. FreeBSD and Solaris binaries will follow soon. These binaries and tarballs have an accompanying SHA256SUMS file signed by my GPG key id (0x3B58D86F). We plan to make the 7.10.2 final release at the end of this coming week - so please test as much as possible; bugs are much cheaper if we find them before the release! -- Regards, Austin Seipp, Haskell Consultant Well-Typed LLP, http://www.well-typed.com/

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