December 2014 - Haskell-Cafe

How best to deal with Monoid/Applicative changes in 7.10 in a backwards-compatable way
by Doug Burke 24 Dec '14

24 Dec '14

I'm trying out the ghc 7.10 RC and am seeing lots of warnings about Monoid and some symbols from Control.Applicative - e.g. The import of ‘Data.Monoid’ is redundant except perhaps to import instances from ‘Data.Monoid’ To import instances alone, use: import Data.Monoid() For now I'm wrapping the import with some CPP so that it will still compile with older ghc versions (and a probably-pointless attempt to be non-ghc-specific, since I have never tested my code with other compilers): #if (!defined(__GLASGOW_HASKELL__)) || (__GLASGOW_HASKELL__ < 710) import Control.Applicative (Applicative(pure), (<$>), (<*>)) import Data.Monoid (Monoid(..)) #else import Control.Applicative ((<$>)) #endif Is this the best way? Am I missing something really obvious? Thanks, Doug

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Re: [Haskell-cafe] HPC and Template Haskell (GHC 7.8.3, Yesod)
by David Turner 24 Dec '14

24 Dec '14

Ok, I can reproduce this with a bare Yesod scaffold (using the latest cabal-install) - see below. If I run cabal build a couple more times, it completes successfully, which is mighty strange! [linuxadmin@vm01 20:19:43 ~ ] $ yesod init Welcome to the Yesod scaffolder. I'm going to be creating a skeleton Yesod project for you. What do you want to call your project? We'll use this for the cabal name. Project name: linker-test Yesod uses Persistent for its (you guessed it) persistence layer. This tool will build in either SQLite or PostgreSQL or MongoDB support for you. We recommend starting with SQLite: it has no dependencies. s = sqlite p = postgresql pf = postgresql + Fay (experimental) mongo = mongodb mysql = MySQL simple = no database, no auth url = Let me specify URL containing a site (advanced) So, what'll it be? simple That's it! I'm creating your files now... --------------------------------------- ___ {-) |\ [m,].-"-. / [][__][__] $/\__/$/ [__][__][__][__]~~~~ | | [][__][__][__][__][] / | [__][__][__][__][__]| /| | [][__][__][__][__][]| || | ~~~~ ejm [__][__][__][__][__]__,__, \__/ --------------------------------------- The foundation for your web application has been built. There are a lot of resources to help you use Yesod. Start with the book: http://www.yesodweb.com/book Take part in the community: http://yesodweb.com/page/community It's highly recommended to follow the quick start guide for installing Yesod: http://www.yesodweb.com/page/quickstart If your system is already configured correctly, please run: cd linker-test && cabal install -j --enable-tests --max-backjumps=-1 --reorder-goals && yesod devel [linuxadmin@vm01 20:20:07 ~ ] $ cd linker-test [linuxadmin@vm01 20:20:11 ~/linker-test ] $ ~/cabal/cabal-install/.cabal-sandbox/bin/cabal configure --disable-tests --enable-coverage --disable-profiling Resolving dependencies... Configuring linker-test-0.0.0... [linuxadmin@vm01 20:20:25 ~/linker-test ] $ ~/cabal/cabal-install/.cabal-sandbox/bin/cabal build Building linker-test-0.0.0... Preprocessing library linker-test-0.0.0... [1 of 7] Compiling Settings.Development ( Settings/Development.hs, dist/build/Settings/Development.o ) [2 of 7] Compiling Settings ( Settings.hs, dist/build/Settings.o ) Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Loading package array-0.5.0.0 ... linking ... done. Loading package stm-2.4.3 ... linking ... done. Loading package async-2.0.1.6 ... linking ... done. Loading package deepseq-1.3.0.2 ... linking ... done. Loading package bytestring-0.10.4.0 ... linking ... done. Loading package containers-0.5.5.1 ... linking ... done. Loading package text-1.1.1.3 ... linking ... done. Loading package hashable-1.2.2.0 ... linking ... done. Loading package scientific-0.3.3.2 ... linking ... done. Loading package attoparsec-0.12.1.2 ... linking ... done. Loading package base64-bytestring-1.0.0.1 ... linking ... done. Loading package blaze-builder-0.3.3.4 ... linking ... done. Loading package byteable-0.1.1 ... linking ... done. Loading package transformers-0.3.0.0 ... linking ... done. Loading package mtl-2.1.3.1 ... linking ... done. Loading package exceptions-0.6.1 ... linking ... done. Loading package base-unicode-symbols-0.2.2.4 ... linking ... done. Loading package transformers-base-0.4.3 ... linking ... done. Loading package monad-control-0.3.3.0 ... linking ... done. Loading package lifted-base-0.2.2.1 ... linking ... done. Loading package mmorph-1.0.4 ... linking ... done. Loading package resourcet-1.1.3 ... linking ... done. Loading package nats-0.2 ... linking ... done. Loading package unordered-containers-0.2.5.1 ... linking ... done. Loading package semigroups-0.15.4 ... linking ... done. Loading package void-0.6.1 ... linking ... done. Loading package conduit-1.2.3 ... linking ... done. Loading package filepath-1.3.0.2 ... linking ... done. Loading package old-locale-1.0.0.6 ... linking ... done. Loading package time-1.4.2 ... linking ... done. Loading package unix-2.7.0.1 ... linking ... done. Loading package directory-1.2.1.0 ... linking ... done. Loading package parsec-3.1.7 ... linking ... done. Loading package network-2.5.0.0 ... linking ... done. Loading package primitive-0.5.4.0 ... linking ... done. Loading package process-1.2.0.0 ... linking ... done. Loading package random-1.0.1.1 ... linking ... done. Loading package zlib-0.5.4.2 ... linking ... done. Loading package streaming-commons-0.1.6 ... linking ... done. Loading package conduit-extra-1.1.4.2 ... linking ... done. Loading package cryptohash-0.11.6 ... linking ... done. Loading package cryptohash-conduit-0.1.1 ... linking ... done. Loading package css-text-0.1.2.1 ... linking ... done. Loading package data-default-class-0.0.1 ... linking ... done. Loading package data-default-instances-base-0.0.1 ... linking ... done. Loading package data-default-instances-containers-0.0.1 ... linking ... done. Loading package dlist-0.7.1 ... linking ... done. Loading package data-default-instances-dlist-0.0.1 ... linking ... done. Loading package data-default-instances-old-locale-0.0.1 ... linking ... done. Loading package data-default-0.5.3 ... linking ... done. Loading package pretty-1.1.1.1 ... linking ... done. Loading package template-haskell ... linking ... done. Loading package file-embed-0.0.7 ... linking ... done. Loading package utf8-string-0.3.8 ... linking ... done. Loading package language-javascript-0.5.13 ... linking ... done. Loading package hjsmin-0.1.4.7 ... linking ... done. Loading package case-insensitive-1.2.0.1 ... linking ... done. Loading package http-types-0.8.5 ... linking ... done. Loading package mime-types-0.1.0.4 ... linking ... done. Loading package old-time-1.1.0.2 ... linking ... done. Loading package system-filepath-0.4.12 ... linking ... done. Loading package system-fileio-0.3.15 ... linking ... done. Loading package unix-compat-0.4.1.3 ... linking ... done. Loading package vault-0.3.0.3 ... linking ... done. Loading package wai-3.0.2 ... linking ... done. Loading package blaze-markup-0.6.1.1 ... linking ... done. Loading package blaze-html-0.7.0.3 ... linking ... done. Loading package http-date-0.0.4 ... linking ... done. Loading package ansi-terminal-0.6.2.1 ... linking ... done. Loading package ansi-wl-pprint-0.6.7.1 ... linking ... done. Loading package transformers-compat-0.3.3.3 ... linking ... done. Loading package optparse-applicative-0.11.0.1 ... linking ... done. Loading package auto-update-0.1.2 ... linking ... done. Loading package fast-logger-2.2.3 ... linking ... done. Loading package stringsearch-0.3.6.5 ... linking ... done. Loading package byteorder-1.0.4 ... linking ... done. Loading package easy-file-0.2.0 ... linking ... done. Loading package binary-0.7.1.0 ... linking ... done. Loading package unix-time-0.3.4 ... linking ... done. Loading package wai-logger-2.2.3 ... linking ... done. Loading package word8-0.1.1 ... linking ... done. Loading package wai-extra-3.0.2.1 ... linking ... done. Loading package simple-sendfile-0.2.18 ... linking ... done. Loading package warp-3.0.2.3 ... linking ... done. Loading package wai-app-static-3.0.0.3 ... linking ... done. Loading package syb-0.4.2 ... linking ... done. Loading package vector-0.10.12.1 ... linking ... done. Loading package aeson-0.8.0.2 ... linking ... done. Loading package cereal-0.4.1.0 ... linking ... done. Loading package securemem-0.1.4 ... linking ... done. Loading package crypto-cipher-types-0.0.9 ... linking ... done. Loading package cipher-aes-0.2.9 ... linking ... done. Loading package crypto-random-0.0.8 ... linking ... done. Loading package cprng-aes-0.6.1 ... linking ... done. Loading package entropy-0.3.4.1 ... linking ... done. Loading package tagged-0.7.3 ... linking ... done. Loading package crypto-api-0.13.2 ... linking ... done. Loading package setenv-0.1.1.1 ... linking ... done. Loading package skein-1.0.9.1 ... linking ... done. Loading package clientsession-0.9.1.1 ... linking ... done. Loading package cookie-0.4.1.4 ... linking ... done. Loading package monad-loops-0.4.2.1 ... linking ... done. Loading package stm-chans-3.0.0.2 ... linking ... done. Loading package monad-logger-0.3.9 ... linking ... done. Loading package mwc-random-0.13.2.2 ... linking ... done. Loading package path-pieces-0.1.4 ... linking ... done. Loading package safe-0.3.8 ... linking ... done. Loading package shakespeare-2.0.2.1 ... linking ... done. Loading package yesod-core-1.4.4.5 ... linking ... done. Loading package yesod-static-1.4.0.3 ... linking ... done. Loading package yaml-0.8.10 ... linking ... done. Loading package publicsuffixlist-0.1 ... linking ... done. Loading package http-client-0.4.5 ... linking ... done. Loading package socks-0.5.4 ... linking ... done. Loading package hourglass-0.2.6 ... linking ... done. Loading package asn1-types-0.3.0 ... linking ... done. Loading package asn1-encoding-0.9.0 ... linking ... done. Loading package cipher-des-0.0.6 ... linking ... done. Loading package cipher-rc4-0.1.4 ... linking ... done. Loading package crypto-numbers-0.2.3 ... linking ... done. Loading package crypto-pubkey-types-0.4.2.3 ... linking ... done. Loading package crypto-pubkey-0.2.4 ... linking ... done. Loading package asn1-parse-0.9.0 ... linking ... done. Loading package pem-0.2.2 ... linking ... done. Loading package x509-1.5.0.1 ... linking ... done. Loading package x509-store-1.5.0 ... linking ... done. Loading package x509-validation-1.5.1 ... linking ... done. Loading package tls-1.2.13 ... linking ... done. Loading package x509-system-1.5.0 ... linking ... done. Loading package connection-0.2.3 ... linking ... done. Loading package http-client-tls-0.2.2 ... linking ... done. Loading package http-conduit-2.1.5 ... linking ... done. Loading package xml-types-0.3.4 ... linking ... done. Loading package xml-conduit-1.2.3 ... linking ... done. Loading package tagstream-conduit-0.5.5.3 ... linking ... done. Loading package authenticate-1.3.2.10 ... linking ... done. Loading package base16-bytestring-0.1.1.6 ... linking ... done. Loading package email-validate-2.0.1 ... linking ... done. Loading package mime-mail-0.4.6 ... linking ... done. Loading package resource-pool-0.2.3.1 ... linking ... done. Loading package silently-1.2.4.1 ... linking ... done. Loading package persistent-2.1.1 ... linking ... done. Loading package persistent-template-2.1 ... linking ... done. Loading package tagsoup-0.13.3 ... linking ... done. Loading package xss-sanitize-0.3.5.4 ... linking ... done. Loading package yesod-persistent-1.4.0.1 ... linking ... done. Loading package yesod-form-1.4.1.1 ... linking ... done. Loading package yesod-auth-1.4.1 ... linking ... done. Loading package yesod-1.4.1 ... linking ... done. [3 of 7] Compiling Settings.StaticFiles ( Settings/StaticFiles.hs, dist/build/Settings/StaticFiles.o ) [4 of 7] Compiling Foundation ( Foundation.hs, dist/build/Foundation.o ) [5 of 7] Compiling Import ( Import.hs, dist/build/Import.o ) [6 of 7] Compiling Handler.Home ( Handler/Home.hs, dist/build/Handler/Home.o ) [7 of 7] Compiling Application ( Application.hs, dist/build/Application.o ) /usr/bin/ld: dist/build/Foundation.dyn_o: relocation R_X86_64_PC32 against undefined symbol `_hpc_tickboxes_linkerzmtestzm0zi0zi0_Settings_hpc' can not be used when making a shared object; recompile with -fPIC /usr/bin/ld: final link failed: Bad value collect2: error: ld returned 1 exit status <no location info>: ghc: phase `Linker' failed (exitcode = 1) [linuxadmin@vm01 20:20:38 ~/linker-test ] $ On 19 December 2014 at 20:21, David Turner <dave.c.turner(a)gmail.com> wrote: > Ok, I can reproduce this with a bare Yesod scaffold: > > [linuxadmin@vm01 20:19:43 ~ ] > $ yesod init > Welcome to the Yesod scaffolder. > I'm going to be creating a skeleton Yesod project for you. > > What do you want to call your project? We'll use this for the cabal name. > > Project name: linker-test > Yesod uses Persistent for its (you guessed it) persistence layer. > This tool will build in either SQLite or PostgreSQL or MongoDB support for you. > We recommend starting with SQLite: it has no dependencies. > > s = sqlite > p = postgresql > pf = postgresql + Fay (experimental) > mongo = mongodb > mysql = MySQL > simple = no database, no auth > url = Let me specify URL containing a site (advanced) > > So, what'll it be? simple > That's it! I'm creating your files now... > > --------------------------------------- > > ___ > {-) |\ > [m,].-"-. / > [][__][__] $/\__/$/ > [__][__][__][__]~~~~ | | > [][__][__][__][__][] / | > [__][__][__][__][__]| /| | > [][__][__][__][__][]| || | ~~~~ > ejm [__][__][__][__][__]__,__, \__/ > > > --------------------------------------- > > The foundation for your web application has been built. > > > There are a lot of resources to help you use Yesod. > Start with the book: http://www.yesodweb.com/book > Take part in the community: http://yesodweb.com/page/community > > > It's highly recommended to follow the quick start guide for > installing Yesod: http://www.yesodweb.com/page/quickstart > > If your system is already configured correctly, please run: > > cd linker-test && cabal install -j --enable-tests > --max-backjumps=-1 --reorder-goals && yesod devel > [linuxadmin@vm01 20:20:07 ~ ] > $ cd linker-test > [linuxadmin@vm01 20:20:11 ~/linker-test ] > $ ~/cabal/cabal-install/.cabal-sandbox/bin/cabal configure > --disable-tests --enable-coverage --disable-profiling > Resolving dependencies... > Configuring linker-test-0.0.0... > [linuxadmin@vm01 20:20:25 ~/linker-test ] > $ ~/cabal/cabal-install/.cabal-sandbox/bin/cabal build > Building linker-test-0.0.0... > Preprocessing library linker-test-0.0.0... > [1 of 7] Compiling Settings.Development ( Settings/Development.hs, > dist/build/Settings/Development.o ) > [2 of 7] Compiling Settings ( Settings.hs, dist/build/Settings.o ) > Loading package ghc-prim ... linking ... done. > Loading package integer-gmp ... linking ... done. > Loading package base ... linking ... done. > Loading package array-0.5.0.0 ... linking ... done. > Loading package stm-2.4.3 ... linking ... done. > Loading package async-2.0.1.6 ... linking ... done. > Loading package deepseq-1.3.0.2 ... linking ... done. > Loading package bytestring-0.10.4.0 ... linking ... done. > Loading package containers-0.5.5.1 ... linking ... done. > Loading package text-1.1.1.3 ... linking ... done. > Loading package hashable-1.2.2.0 ... linking ... done. > Loading package scientific-0.3.3.2 ... linking ... done. > Loading package attoparsec-0.12.1.2 ... linking ... done. > Loading package base64-bytestring-1.0.0.1 ... linking ... done. > Loading package blaze-builder-0.3.3.4 ... linking ... done. > Loading package byteable-0.1.1 ... linking ... done. > Loading package transformers-0.3.0.0 ... linking ... done. > Loading package mtl-2.1.3.1 ... linking ... done. > Loading package exceptions-0.6.1 ... linking ... done. > Loading package base-unicode-symbols-0.2.2.4 ... linking ... done. > Loading package transformers-base-0.4.3 ... linking ... done. > Loading package monad-control-0.3.3.0 ... linking ... done. > Loading package lifted-base-0.2.2.1 ... linking ... done. > Loading package mmorph-1.0.4 ... linking ... done. > Loading package resourcet-1.1.3 ... linking ... done. > Loading package nats-0.2 ... linking ... done. > Loading package unordered-containers-0.2.5.1 ... linking ... done. > Loading package semigroups-0.15.4 ... linking ... done. > Loading package void-0.6.1 ... linking ... done. > Loading package conduit-1.2.3 ... linking ... done. > Loading package filepath-1.3.0.2 ... linking ... done. > Loading package old-locale-1.0.0.6 ... linking ... done. > Loading package time-1.4.2 ... linking ... done. > Loading package unix-2.7.0.1 ... linking ... done. > Loading package directory-1.2.1.0 ... linking ... done. > Loading package parsec-3.1.7 ... linking ... done. > Loading package network-2.5.0.0 ... linking ... done. > Loading package primitive-0.5.4.0 ... linking ... done. > Loading package process-1.2.0.0 ... linking ... done. > Loading package random-1.0.1.1 ... linking ... done. > Loading package zlib-0.5.4.2 ... linking ... done. > Loading package streaming-commons-0.1.6 ... linking ... done. > Loading package conduit-extra-1.1.4.2 ... linking ... done. > Loading package cryptohash-0.11.6 ... linking ... done. > Loading package cryptohash-conduit-0.1.1 ... linking ... done. > Loading package css-text-0.1.2.1 ... linking ... done. > Loading package data-default-class-0.0.1 ... linking ... done. > Loading package data-default-instances-base-0.0.1 ... linking ... done. > Loading package data-default-instances-containers-0.0.1 ... linking ... done. > Loading package dlist-0.7.1 ... linking ... done. > Loading package data-default-instances-dlist-0.0.1 ... linking ... done. > Loading package data-default-instances-old-locale-0.0.1 ... linking ... done. > Loading package data-default-0.5.3 ... linking ... done. > Loading package pretty-1.1.1.1 ... linking ... done. > Loading package template-haskell ... linking ... done. > Loading package file-embed-0.0.7 ... linking ... done. > Loading package utf8-string-0.3.8 ... linking ... done. > Loading package language-javascript-0.5.13 ... linking ... done. > Loading package hjsmin-0.1.4.7 ... linking ... done. > Loading package case-insensitive-1.2.0.1 ... linking ... done. > Loading package http-types-0.8.5 ... linking ... done. > Loading package mime-types-0.1.0.4 ... linking ... done. > Loading package old-time-1.1.0.2 ... linking ... done. > Loading package system-filepath-0.4.12 ... linking ... done. > Loading package system-fileio-0.3.15 ... linking ... done. > Loading package unix-compat-0.4.1.3 ... linking ... done. > Loading package vault-0.3.0.3 ... linking ... done. > Loading package wai-3.0.2 ... linking ... done. > Loading package blaze-markup-0.6.1.1 ... linking ... done. > Loading package blaze-html-0.7.0.3 ... linking ... done. > Loading package http-date-0.0.4 ... linking ... done. > Loading package ansi-terminal-0.6.2.1 ... linking ... done. > Loading package ansi-wl-pprint-0.6.7.1 ... linking ... done. > Loading package transformers-compat-0.3.3.3 ... linking ... done. > Loading package optparse-applicative-0.11.0.1 ... linking ... done. > Loading package auto-update-0.1.2 ... linking ... done. > Loading package fast-logger-2.2.3 ... linking ... done. > Loading package stringsearch-0.3.6.5 ... linking ... done. > Loading package byteorder-1.0.4 ... linking ... done. > Loading package easy-file-0.2.0 ... linking ... done. > Loading package binary-0.7.1.0 ... linking ... done. > Loading package unix-time-0.3.4 ... linking ... done. > Loading package wai-logger-2.2.3 ... linking ... done. > Loading package word8-0.1.1 ... linking ... done. > Loading package wai-extra-3.0.2.1 ... linking ... done. > Loading package simple-sendfile-0.2.18 ... linking ... done. > Loading package warp-3.0.2.3 ... linking ... done. > Loading package wai-app-static-3.0.0.3 ... linking ... done. > Loading package syb-0.4.2 ... linking ... done. > Loading package vector-0.10.12.1 ... linking ... done. > Loading package aeson-0.8.0.2 ... linking ... done. > Loading package cereal-0.4.1.0 ... linking ... done. > Loading package securemem-0.1.4 ... linking ... done. > Loading package crypto-cipher-types-0.0.9 ... linking ... done. > Loading package cipher-aes-0.2.9 ... linking ... done. > Loading package crypto-random-0.0.8 ... linking ... done. > Loading package cprng-aes-0.6.1 ... linking ... done. > Loading package entropy-0.3.4.1 ... linking ... done. > Loading package tagged-0.7.3 ... linking ... done. > Loading package crypto-api-0.13.2 ... linking ... done. > Loading package setenv-0.1.1.1 ... linking ... done. > Loading package skein-1.0.9.1 ... linking ... done. > Loading package clientsession-0.9.1.1 ... linking ... done. > Loading package cookie-0.4.1.4 ... linking ... done. > Loading package monad-loops-0.4.2.1 ... linking ... done. > Loading package stm-chans-3.0.0.2 ... linking ... done. > Loading package monad-logger-0.3.9 ... linking ... done. > Loading package mwc-random-0.13.2.2 ... linking ... done. > Loading package path-pieces-0.1.4 ... linking ... done. > Loading package safe-0.3.8 ... linking ... done. > Loading package shakespeare-2.0.2.1 ... linking ... done. > Loading package yesod-core-1.4.4.5 ... linking ... done. > Loading package yesod-static-1.4.0.3 ... linking ... done. > Loading package yaml-0.8.10 ... linking ... done. > Loading package publicsuffixlist-0.1 ... linking ... done. > Loading package http-client-0.4.5 ... linking ... done. > Loading package socks-0.5.4 ... linking ... done. > Loading package hourglass-0.2.6 ... linking ... done. > Loading package asn1-types-0.3.0 ... linking ... done. > Loading package asn1-encoding-0.9.0 ... linking ... done. > Loading package cipher-des-0.0.6 ... linking ... done. > Loading package cipher-rc4-0.1.4 ... linking ... done. > Loading package crypto-numbers-0.2.3 ... linking ... done. > Loading package crypto-pubkey-types-0.4.2.3 ... linking ... done. > Loading package crypto-pubkey-0.2.4 ... linking ... done. > Loading package asn1-parse-0.9.0 ... linking ... done. > Loading package pem-0.2.2 ... linking ... done. > Loading package x509-1.5.0.1 ... linking ... done. > Loading package x509-store-1.5.0 ... linking ... done. > Loading package x509-validation-1.5.1 ... linking ... done. > Loading package tls-1.2.13 ... linking ... done. > Loading package x509-system-1.5.0 ... linking ... done. > Loading package connection-0.2.3 ... linking ... done. > Loading package http-client-tls-0.2.2 ... linking ... done. > Loading package http-conduit-2.1.5 ... linking ... done. > Loading package xml-types-0.3.4 ... linking ... done. > Loading package xml-conduit-1.2.3 ... linking ... done. > Loading package tagstream-conduit-0.5.5.3 ... linking ... done. > Loading package authenticate-1.3.2.10 ... linking ... done. > Loading package base16-bytestring-0.1.1.6 ... linking ... done. > Loading package email-validate-2.0.1 ... linking ... done. > Loading package mime-mail-0.4.6 ... linking ... done. > Loading package resource-pool-0.2.3.1 ... linking ... done. > Loading package silently-1.2.4.1 ... linking ... done. > Loading package persistent-2.1.1 ... linking ... done. > Loading package persistent-template-2.1 ... linking ... done. > Loading package tagsoup-0.13.3 ... linking ... done. > Loading package xss-sanitize-0.3.5.4 ... linking ... done. > Loading package yesod-persistent-1.4.0.1 ... linking ... done. > Loading package yesod-form-1.4.1.1 ... linking ... done. > Loading package yesod-auth-1.4.1 ... linking ... done. > Loading package yesod-1.4.1 ... linking ... done. > [3 of 7] Compiling Settings.StaticFiles ( Settings/StaticFiles.hs, > dist/build/Settings/StaticFiles.o ) > [4 of 7] Compiling Foundation ( Foundation.hs, dist/build/Foundation.o ) > [5 of 7] Compiling Import ( Import.hs, dist/build/Import.o ) > [6 of 7] Compiling Handler.Home ( Handler/Home.hs, > dist/build/Handler/Home.o ) > [7 of 7] Compiling Application ( Application.hs, dist/build/Application.o ) > /usr/bin/ld: dist/build/Foundation.dyn_o: relocation R_X86_64_PC32 > against undefined symbol > `_hpc_tickboxes_linkerzmtestzm0zi0zi0_Settings_hpc' can not be used > when making a shared object; recompile with -fPIC > /usr/bin/ld: final link failed: Bad value > collect2: error: ld returned 1 exit status > > <no location info>: ghc: phase `Linker' failed (exitcode = 1) > [linuxadmin@vm01 20:20:38 ~/linker-test ] > $ > > On 19 December 2014 at 20:03, David Turner > <dct25-561bs(a)mythic-beasts.com> wrote: >> [Failed to copy haskell-cafe in to my first response:] >> >> I thought I had disabled profiling there, although it was enabled when >> I was using cabal which wrote the original command line so that might >> explain it. >> >> I will try a more recent cabal-install this evening. >> >> Thanks for the speedy response! >> >> [Time passes - second response:] >> >> I have tried cabal-install build from the latest revision (4aabb4f4b1) >> with the same result. From a clean checkout of my source: >> >> $ ~/cabal/cabal-install/.cabal-sandbox/bin/cabal configure >> --disable-tests --enable-coverage --disable-profiling >> $ ~/cabal/cabal-install/.cabal-sandbox/bin/cabal build -v >> >> Similar outcome. >> >> >> >> >> On 19 December 2014 at 18:53, Carter Schonwald >> <carter.schonwald(a)gmail.com> wrote: >>> i think the fix for this, or a related problem is merged into >>> cabal/cabal-install head, and will be in 1.22 >>> >>> does your problem go away if you dont enable profiled builds? (is so, its >>> likely the same problem) >>> >>> On Fri, Dec 19, 2014 at 1:32 PM, David Turner >>> <dct25-561bs(a)mythic-beasts.com> wrote: >>>> >>>> Hi, >>>> >>>> I'm having trouble making a HPC build of a Yesod application. It fails >>>> with: >>>> >>>> /usr/bin/ld: dist/build/StreamReading/Config.dyn_o: relocation >>>> R_X86_64_PC32 against undefined symbol >>>> `_hpc_tickboxes_tracszmenterprisezm0zi0zi0_Settings_hpc' can not be >>>> used when making a shared object; recompile with -fPIC >>>> >>>> I've narrowed it down to a call to ghc and posted the output in all >>>> its gory detail at http://lpaste.net/116872 if that's any help. >>>> >>>> Of note is that dist/build/Settings.dyn_o is unexpectedly missing from >>>> the list of parameters to the last call to gcc, and the missing symbol >>>> is defined in the same. There are, in fact, quite a number of missing >>>> .dyn_o files in that list. >>>> >>>> Slightly weirdly, when I run the same command line again, it seems to >>>> work. At least, there are no errors reported and the exit code is 0. >>>> >>>> Any ideas? >>>> >>>> Cheers, >>>> >>>> David >>>> _______________________________________________ >>>> Haskell-Cafe mailing list >>>> Haskell-Cafe(a)haskell.org >>>> http://www.haskell.org/mailman/listinfo/haskell-cafe >>> >>>

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Weird reachability issue with haskell.org my my Italian ISP (fastweb)
by Alfredo Di Napoli 23 Dec '14

23 Dec '14

Hello Cafè, let me start with the email I've sent to Rackspace, which will help you understand the context: Hi there! > I'm trying to understand how come I can't reach www.haskell.org from my ISP > here in Italy (fastweb). In order to troubleshoot the issue, I tried dig on > it, revealing it's hosted by you: > > dig haskell.org > > ; <<>> DiG 9.8.3-P1 <<>> haskell.org > ;; global options: +cmd > ;; Got answer: > ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63629 > ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 > ;; QUESTION SECTION: > ;haskell.org.INA > ;; ANSWER SECTION: > haskell.org. 299 IN A 23.253.242.70 > ;; Query time: 139 msec > ;; SERVER: 8.8.8.8#53(8.8.8.8) > ;; WHEN: Tue Dec 23 18:33:00 2014 > ;; MSG SIZE rcvd: 45 > > Trying a whois reveals the subnet is the entire 23.253.0.0 one: > > Rackspace Cloud Servers RACKS-8-1387376775861482 (NET-23-253-80-0-1) > 23.253.80.0 - 23.253.95.255 > Rackspace Hosting RACKS-8-NET-15 (NET-23-253-0-0-1) 23.253.0.0 - > 23.253.255.25 > > If I try to ping the IP directly, it obviously doesn't work, so I have > tried contiguous IP addresses in the same subnet to see if the subnet > itself was reachable at all.. trying 23.253.89.73 indeed worked! It > resolved to > http://www.papamurphys.com/ > This means my ISP can reach that subnet, but doesn't explain why it can't > connect to 23.253.242.70. That's very weird indeed, as every other website is reachable, only haskell.org is not! How funny my fate is! I'm one of the few Haskellers in Italy and yet I cannot access the website.. perhaps is the consequence of "Avoid success at all costs"?? :) :) Jokes aside, do you guys know (I'm asking mainly to Austin here) if rackspace uses some weird setup for their website deployment or if haskell.org is hosted "the usual way" and listening on port 80? Thanks in advance for the 1% who is concerned, for all the other 99%, merry Xmas ;) Alfredo

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Allocating a new ByteString
by Tristan Seligmann 23 Dec '14

23 Dec '14

I'm calling a function by FFI that returns two strings by writing into output buffers that you provide. The code I currently have looks like this (minus some error handling): > import qualified Data.ByteString as S > import qualified Data.ByteString.Unsafe as SU > > import Foreign.C (CChar, CInt(..), CSize(..)) > import Foreign.ForeignPtr (mallocForeignPtrBytes, withForeignPtr) > import Foreign.Ptr (Ptr) > import System.IO.Unsafe (unsafePerformIO) > > seed_keypair :: S.ByteString -> (S.ByteString, S.ByteString) > seed_keypair seed | S.length seed /= signSeed = error "seed has incorrect length" > | otherwise = unsafePerformIO $ do > pk <- mallocForeignPtrBytes signPK > sk <- mallocForeignPtrBytes signSK > SU.unsafeUseAsCString seed $ \pseed -> > withForeignPtr pk $ \ppk -> > withForeignPtr sk $ \psk -> do > 0 <- c_sign_seed_keypair ppk psk pseed > bpk <- S.packCStringLen (ppk, signPK) > bsk <- S.packCStringLen (psk, signSK) > return (bpk, bsk) > > foreign import ccall "crypto_sign_seed_keypair" > c_sign_seed_keypair :: Ptr CChar -> Ptr CChar -> Ptr CChar -> IO CInt However, this needlessly makes a copy of the output buffers to create the final result. What I really want to do is just write the string directly into a buffer allocated and used by a new ByteString; is there some way to accomplish this? (Any other comments about what I'm doing would also be appreciated, this happens to be my first attempt at using FFI!) -- mithrandi, i Ainil en-Balandor, a faer Ambar

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Latest Template Haskell Breaks Package
by Dominic Steinitz 23 Dec '14

23 Dec '14

Hello Fellow Haskellers, I have become a maintainer for yarr (https://hackage.haskell.org/package/yarr) This no longer compiles with ghc-7.8.3 because it specifies base == 4.6. Relaxing this to base >=4.6 && <4.8 tells me I need a newer version of Template Haskell > rejecting: template-haskell-2.7.0.0, 2.6.0.0, 2.5.0.0, 2.4.0.1, 2.4.0.0, > 2.3.0.1, 2.3.0.0, 2.2.0.0 (conflict: yarr => template-haskell>=2.8 && <2.9) If I now relax the constraint for Template Haskell I get a compiler error as there has been a breaking change from Template Haskell 2.9 to 2.10. > Data/Yarr/Utils/FixedVector/VecTuple.hs:45:16: > Couldn't match expected type ‘TypeQ -> Q Dec’ > with actual type ‘Q Dec’ > The function ‘tySynInstD’ is applied to three arguments, > but its type ‘Name -> TySynEqnQ -> DecQ’ has only two And indeed looking at the changes in http://git.haskell.org/packages/template-haskell.git/commitdiff/ccd7891c536… I can see that the function in question has changed. > -tySynInstD :: Name -> [TypeQ] -> TypeQ -> DecQ > -tySynInstD tc tys rhs = > +tySynInstD :: Name -> [TySynEqnQ] -> DecQ > +tySynInstD tc eqns = Did I miss some announcement of this breaking change and the advice on what to do about it? If I did can someone please point me at the relevant document. If not then I feel sad and would be very grateful if someone could help me as I know very little about Template Haskell. Many thanks Dominic Steinitz dominic(a)steinitz.org http://idontgetoutmuch.wordpress.com

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ANNOUNCE: GHC version 7.8.4
by Austin Seipp 23 Dec '14

23 Dec '14

============================================================== The (Interactive) Glasgow Haskell Compiler -- version 7.8.4 ============================================================== The GHC Team is pleased to announce a new patchlevel release of GHC, 7.8.4. This is an important bugfix release relative to 7.8.3 (with over 30 defects fixed), so we highly recommend upgrading from the previous 7.8 releases. The full release notes are here: https://downloads.haskell.org/~ghc/7.8.4/docs/html/users_guide/release-7-8-… How to get it ~~~~~~~~~~~~~ The easy way is to go to the web page, which should be self-explanatory: https://www.haskell.org/ghc/ We supply binary builds in the native package format for many platforms, and the source distribution is available from the same place. Packages will appear as they are built - if the package for your system isn't available yet, please try again later. 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). On-line GHC-related resources ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Relevant URLs on the World-Wide Web: GHC home page http://www.haskell.org/ghc/ GHC developers' home page http://ghc.haskell.org/trac/ghc/ Haskell home page http://www.haskell.org/ Supported Platforms ~~~~~~~~~~~~~~~~~~~ The list of platforms we support, and the people responsible for them, is here: http://ghc.haskell.org/trac/ghc/wiki/Platforms http://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: http://ghc.haskell.org/trac/ghc/wiki/Building Developers ~~~~~~~~~~ We welcome new contributors. Instructions on accessing our source code repository, and getting started with hacking on GHC, are available from the GHC's developer's site run by Trac: http://ghc.haskell.org/trac/ghc/ Mailing lists ~~~~~~~~~~~~~ We run mailing lists for GHC users and bug reports; to subscribe, use the web interfaces at http://www.haskell.org/mailman/listinfo/glasgow-haskell-users http://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 http://www.haskell.org/mailman/listinfo/ Some GHC developers hang out on #haskell on IRC, too: http://www.haskell.org/haskellwiki/IRC_channel Please report bugs using our bug tracking system. Instructions on reporting bugs can be found here: http://www.haskell.org/ghc/reportabug Hashes & Signatures ~~~~~~~~~~~~~~~~~ On https://downloads.haskell.org/~ghc/7.8.4/ you will find a signed copy of the SHA256 hashes for the tarballs, using my GPG key (keyid 0x3B58D86F). -- Regards, Austin Seipp, Haskell Consultant Well-Typed LLP, http://www.well-typed.com/

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ANN: New FP meetup group in the Switzerland Romandie area
by Alois Cochard 23 Dec '14

23 Dec '14

Hey haskellers, I just wanted to let you know that I have created a new "Functional Romandie" meetup group: http://www.meetup.com/Functional-Romandie/ The aim is to gather as many as possible FP enthusiast in the area (not specific to given programming language). If you are interested please get in touch or join the meetup group! Cheers -- *Λ\ois* http://twitter.com/aloiscochard http://github.com/aloiscochard

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Cabal Config constraints vs. constraint
by Christopher Reichert 22 Dec '14

22 Dec '14

Hey everyone, I am trying to add a list of version constraints to my global cabal config (~/.cabal/config) using the `constraints` keyword. However, after adding the list to the end of the ~/.cabal/config file and running `cabal update`, I noticed this warning: $ cabal update Warning: /home/test/.cabal/config: Unrecognized field constraints on line 176 Downloading the latest package list from hackage.haskell.org I did find this issue annotated as a FIXME in the cabal source: https://github.com/haskell/cabal/blob/64761550bb617ee5d9449512bd3e500489cfd… It appears as though `constraints` are currently only supported in cabal.config (and maybe cabal.sandbox.config) Do individual constraints (e.g. `constraint:`) have the same effect as a list of constraints? Does the `constraint` setting work in both global (~/.cabal/config) and local cabal.config the exact same way (especially if I have a long list of them) Is there any reason I would use individual constraints over a list of constraints? My assumption is that they work the same way in both ~/.cabal/config && cabal.config. I'm considering patching the cabal source to support the `constraints` setting in the ~/.cabal/config file. Is there any reason this might have been passed up front? More discussion here: https://github.com/fpco/stackage-server/issues/67 Any help or advice would be greatly appreciated. Thanks, -Christopher -- Christopher Reichert irc: creichert gpg: C81D 18C8 862A 3618 1376 FFA5 6BFC A992 9955 929B

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Could someone help me to understand funB?
by Magicloud Magiclouds 22 Dec '14

22 Dec '14

Hi, Following code is to get a list of primes. Now it is hard for me to understand funB. I mean I can see what it does. But I cannot see the detailed process by every language part. import Control.Monad isPrime :: Integer -> Bool isPrime i = ap funA funB i funA :: Integer -> [Integer] -> Bool funA x xs = all (\x' -> (mod x x') /= 0) xs funB :: Integer -> [Integer] funB = flip takeWhile primes . ( . join (*)) . flip (<=) primes :: [Integer] primes = 2 : filter isPrime [3, 5 ..] main :: IO () main = print $ take 10 primes -- 竹密岂妨流水过山高哪阻野云飞 And for G+, please use magiclouds#gmail.com.

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Template haskell: This pattern-binding binds no variables
by Michael Baikov 21 Dec '14

21 Dec '14

I'm trying to introduce a new local variable to some scope, in this example this scope is represented by print $( varE ohNoes) Everything works as expected, but I'm getting a warning message which I don't seem quite right to me. Am I doing anything wrong? ---- Blah.hs ---- {-# LANGUAGE TemplateHaskell #-} module Blah where import Language.Haskell.TH sample :: Q Exp sample = newName "ohNoes" >>= \ohNoes -> [| let $( varP ohNoes ) = "Teh warning!" in print $( varE ohNoes ) |] ---- Main.hs ---- {-# LANGUAGE TemplateHaskell #-} module Main where import Blah main :: IO () main = $( sample ) ---- output ---- Blah.hs:8:49: Warning: This pattern-binding binds no variables: $(varP ohNoes) = "Teh warning!" sample ======> let ohNoes_a2Al = "Teh warning!" in print ohNoes_a2Al

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