November 2016 - ghc-devs

install pandoc with cabal update
by CRUMEYROLLE Pierre 10 Nov '16

10 Nov '16

hello y try to install pandoc in mode offline but the standard installation from source preconise to execute cabal update . it seems that cabal update try to connect and download package from hackage.haskell.org. do you known how to execute offline installation ? ghc 7.10.3 cabal 1.24.0.0 best regards

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ppr of HsDo
by Alan & Kim Zimmerman 10 Nov '16

10 Nov '16

The pretty printer turns foo = do let x = 1 Just 5 into foo = do { let x = 1; Just 5 } which does not parse, complaining about "parse error on input ‘Just’" Is this a parser error or a ppr problem? I am keen to fix the ppr to output foo = do let x = 1 Just 5 but I am not sure if there is a parser bug too. Alan

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D2638: Reviewers Needed
by Thomas Jakway 06 Nov '16

06 Nov '16

My first patch to GHC <https://phabricator.haskell.org/D2638> is on Phab and Matthew Pickering suggested I get someone knowledgeable about the register allocator to review it. I checked the Code Owners page <https://ghc.haskell.org/trac/ghc/wiki/CodeOwners> but it's very out of date and doesn't mention the NCG specifically. If anyone here familiar with the backend would care to take a look I would very much appreciate it. Thanks, Thomas Jakway

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Re: Submitting a patch for hsc2hs
by Ryan Scott 04 Nov '16

04 Nov '16

Hi Erik, I'm not sure if the hsc2hs repo [1] has "official" Phabricator integration, but what I did when I submitted a patch to hsc2hs was: 1. Commit your changes 2. Because the hsc2hs repo doesn't have an .arcconfig file, you have to manually point arcanist to the right URL by running: arc diff --conduit-uri=https://phabricator.haskell.org Ryan S. ----- [1] http://git.haskell.org/hsc2hs.git

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Submitting a patch for hsc2hs
by Erik de Castro Lopo 04 Nov '16

04 Nov '16

HI all, How would I go about submitting a patch to hsc2hs? Patch below. Erik >From 446e43994e39c763e2fcc3a3accea3e61c3ce767 Mon Sep 17 00:00:00 2001 From: Erik de Castro Lopo <erikd(a)mega-nerd.com> Date: Fri, 4 Nov 2016 20:08:06 +1100 Subject: [PATCH] Fix type signature of main test function During C compiler feature testing, the `main` function was defined with a parameter list of `(int argc, char *argv [])` but these parameters were not used. This results in compiler warnings when the generated file is compiled with the `-Wextra` warning flag added to the `cc-options` of the cabal file. --- DirectCodegen.hs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/DirectCodegen.hs b/DirectCodegen.hs index 37564ee..2a88784 100644 --- a/DirectCodegen.hs +++ b/DirectCodegen.hs @@ -63,7 +63,7 @@ outputDirect config outName outDir outBase name toks = do outTemplateHeaderCProg (cTemplate config)++ concatMap outFlagHeaderCProg flags++ concatMap outHeaderCProg specials++ - "\nint main (int argc, char *argv [])\n{\n"++ + "\nint main (void)\n{\n"++ outHeaderHs flags (if needsH then Just outHName else Nothing) specials++ outHsLine (SourcePos name 0)++ concatMap outTokenHs toks++ -- 2.10.1 -- ---------------------------------------------------------------------- Erik de Castro Lopo http://www.mega-nerd.com/

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Building with recent binutils require --no-pie
by Alan & Kim Zimmerman 04 Nov '16

04 Nov '16

Hi all For anyone building on Debian testing or similar and getting linker failures, there is currently a workaround in progress by Ben Gamari that can be used. It is based on first applying D2672, D2673, and D2674 and then configuring with ./configure \ CONF_CC_OPTS_STAGE2=-fno-PIE \ CONF_GCC_LINKER_OPTS_STAGE2=-no-pie \ CONF_LD_LINKER_OPTS_STAGE2=-no-pie \ CONF_CC_OPTS_STAGE0=-no-pie \ CONF_GCC_LINKER_OPTS_STAGE0=-no-pie \ CONF_LD_LINKER_OPTS_STAGE0=-no-pie \ CONF_HC_OPTS_STAGE0=-optl=-no-pie See https://gist.github.com/alanz/570eb6f1c0ae7e989f493f1b69904c28 for a more legible version. Regards Alan

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simple diagrams about GHC development flow
by Takenobu Tani 04 Nov '16

04 Nov '16

Hi cafe, For myself and new contributors, I drew overview diagrams about GHC development flow. GHC development flow http://takenobu-hs.github.io/downloads/ghc_development_flow.pdf https://github.com/takenobu-hs/ghc-development-flow Let's enjoy :) Regards, Takenobu

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Compilation optimisation performance example - HaRe
by Alan & Kim Zimmerman 01 Nov '16

01 Nov '16

At the moment HaRe has -O0 set for the library. Here are some timing differences on my machine with optimisation on and off With normal optimisation, we get $ rm -fr dist-newstyle/ $ cabal new-configure --enable-test $ time cabal new-build real 6m54.778s user 7m3.156s sys 0m4.504s With -O0, the timing for the same commands is real 0m36.427s user 0m41.448s sys 0m2.544s So optimisation slows it down from 36 seconds to 7 minutes. Alan

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