[GHC] #7592: Building the latest master branch on FreeBSD 9.1 fails
#7592: Building the latest master branch on FreeBSD 9.1 fails -----------------------------+---------------------------------------------- Reporter: kazu-yamamoto | Owner: Type: bug | Status: new Priority: normal | Component: Build System Version: 7.7 | Keywords: Os: Unknown/Multiple | Architecture: Unknown/Multiple Failure: None/Unknown | Blockedby: Blocking: | Related: -----------------------------+---------------------------------------------- The following sequence fails on FreeBSD 9.1: {{{ % perl boot % ./configure --prefix=/ghc-head --with-iconv-includes=/usr/local/include --with-iconv-libraries=/usr/local/lib --with-gmp- includes=/usr/local/include --with-gmp-libraries=/usr/local/lib --with- gcc=/usr/local/bin/gcc47 --with-gcc-4.2=/usr/local/bin/gcc47 % gmake -j10 -d MAKE=gmake ... Putting child 0x801e5fd80 (ghc/stage1/package-data.mk) PID 36063 on the chain. Recipe of `ghc/stage1/package-data.mk' is being run. Pruning file `compiler/stage1/package-data.mk'. Live child 0x801e5fd80 (ghc/stage1/package-data.mk) PID 36063 Configuring ghc-bin-7.7.20130111... Warning: 'data-dir: ..' is a relative path outside of the source tree. This will not work when generating a tarball with 'sdist'. Reaping winning child 0x801e5fd80 PID 36063 Removing child 0x801e5fd80 PID 36063 from chain. Considering target file `ghc/stage1/package-data.mk'. File `ghc/stage1/package-data.mk' was considered already. Re-executing[2]: gmake -r --no-print-directory -f ghc.mk phase=0 phase_0_builds GNU Make 3.82 Built for amd64-portbld-freebsd9.1 Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Reading makefiles... Reading makefile `ghc.mk'... ghc.mk:84: *** Make has restarted itself 2 times; is there a makefile bug?. Sto p. Reaping losing child 0x80156e290 PID 34605 gmake: *** [all] Error 2 Removing child 0x80156e290 PID 34605 from chain. }}} If I type "gmake -j10 MAKE=gmake" gain, the building completes. I believe this is relating to http://www.haskell.org/pipermail/glasgow- haskell-users/2012-March/022150.html Actually if I remove "error" on line 84, this does not happen and the building completes without any problems. GHC for bootstrapping: 7.4.1, GCC 4.7.3, gmake: 3.82 -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#7592: Building the latest master branch on FreeBSD 9.1 fails --------------------------------+------------------------------------------- Reporter: kazu-yamamoto | Owner: pgj Type: bug | Status: new Priority: normal | Component: Build System Version: 7.7 | Keywords: Os: FreeBSD | Architecture: Unknown/Multiple Failure: Building GHC failed | Blockedby: Blocking: | Related: --------------------------------+------------------------------------------- Changes (by pgj): * cc: pgj@… (added) * failure: None/Unknown => Building GHC failed * os: Unknown/Multiple => FreeBSD * owner: => pgj Comment: Take. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#7592: Building the latest master branch on FreeBSD 9.1 fails --------------------------------+------------------------------------------- Reporter: kazu-yamamoto | Owner: pgj Type: bug | Status: new Priority: normal | Component: Build System Version: 7.7 | Keywords: Os: FreeBSD | Architecture: Unknown/Multiple Failure: Building GHC failed | Blockedby: Blocking: | Related: --------------------------------+------------------------------------------- Comment(by pgj): I think this a very special concurrency bug that can be only produced on really fast systems. I could not do that with my own machines, but this indeed caused problems at the FreeBSD package building cluster [1] so it has been patched for the corresponding port in the Ports Collection. But let me know if you have any recommendations on how to solve this. [1] http://www.freebsd.org/cgi/cvsweb.cgi/ports/lang/ghc/files/patch- ghc.mk?rev=1.2;content-type=text%2Fx-cvsweb-markup -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#7592: Building the latest master branch on FreeBSD 9.1 fails --------------------------------+------------------------------------------- Reporter: kazu-yamamoto | Owner: pgj Type: bug | Status: new Priority: normal | Component: Build System Version: 7.7 | Keywords: Os: FreeBSD | Architecture: Unknown/Multiple Failure: Building GHC failed | Blockedby: Blocking: | Related: --------------------------------+------------------------------------------- Comment(by kazu-yamamoto): I know this patch. Probably my machine("12 cores" machine (Intel Xeon E5645, two sockets, 6 cores per 1 CPU, two QPI between two CPUs)) is too fast. On my machine, 3 tries are not good enough. I modified the make file so as to retry 4 times. I should note that I have another machine of same spec and run Linux 3 on it. It does not cause this problem without this kind patch. So, I believe that we can solve this even on FreeBSD. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#7592: Building the latest master branch on FreeBSD 9.1 fails ---------------------------------+------------------------------------------ Reporter: kazu-yamamoto | Owner: pgj Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 7.7 Keywords: | Os: FreeBSD Architecture: Unknown/Multiple | Failure: Building GHC failed Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Changes (by igloo): * difficulty: => Unknown Comment: I assume this only happens when a `-j` flag is used? If running this: {{{ gmake -dr --no-print-directory -f ghc.mk phase=0 phase_0_builds }}} after the boot and configure commands also fails, can you attach the full output of it please? -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#7592: Building the latest master branch on FreeBSD 9.1 fails ---------------------------------+------------------------------------------ Reporter: kazu-yamamoto | Owner: pgj Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 7.7 Keywords: | Os: FreeBSD Architecture: Unknown/Multiple | Failure: Building GHC failed Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Comment(by igloo): Sorry, I meant: {{{ gmake -j10 -dr --no-print-directory -f ghc.mk phase=0 phase_0_builds }}} (assuming the -j is necessary). -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#7592: Building the latest master branch on FreeBSD 9.1 fails ---------------------------------+------------------------------------------ Reporter: kazu-yamamoto | Owner: pgj Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 7.7 Keywords: | Os: FreeBSD Architecture: Unknown/Multiple | Failure: Building GHC failed Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Comment(by kazu-yamamoto): {{{ gmake -j10 -dr --no-print-directory -f ghc.mk phase=0 phase_0_builds }}} succeeded. {{{ Considering target file `phase_0_builds'. File `phase_0_builds' does not exist. Considering target file `utils/hsc2hs/dist/build/.depend.haskell'. File `utils/hsc2hs/dist/build/.depend.haskell' was considered already. Considering target file `utils/hsc2hs/dist/build/.depend.c_asm'. File `utils/hsc2hs/dist/build/.depend.c_asm' was considered already. Considering target file `utils/genprimopcode/dist/build/.depend.haskell'. File `utils/genprimopcode/dist/build/.depend.haskell' was considered already. Considering target file `utils/genprimopcode/dist/build/.depend.c_asm'. File `utils/genprimopcode/dist/build/.depend.c_asm' was considered already. Finished prerequisites of target file `phase_0_builds'. Must remake target `phase_0_builds'. Successfully remade target file `phase_0_builds'. }}} -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#7592: Building the latest master branch on FreeBSD 9.1 fails ---------------------------------+------------------------------------------ Reporter: kazu-yamamoto | Owner: pgj Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 7.7 Keywords: | Os: FreeBSD Architecture: Unknown/Multiple | Failure: Building GHC failed Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Comment(by igloo): If that's the full output then it must be from an already built tree. Could you try in a fresh tree please? -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#7592: Building the latest master branch on FreeBSD 9.1 fails ---------------------------------+------------------------------------------ Reporter: kazu-yamamoto | Owner: pgj Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 7.7 Keywords: | Os: FreeBSD Architecture: Unknown/Multiple | Failure: Building GHC failed Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Comment(by kazu-yamamoto): No. Just a tail part. I did: {{{ % gmake maintainer-clean % perl boot % ./configure --prefix=/ghc-head --with-iconv-includes=/usr/local/include --with-iconv-libraries=/usr/local/lib --with-gmp- includes=/usr/local/include --with-gmp-libraries=/usr/local/lib --with- gcc=/usr/local/bin/gcc47 --with-gcc-4.2=/usr/local/bin/gcc47 % gmake -j10 -dr --no-print-directory -f ghc.mk phase=0 phase_0_builds }}} -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#7592: Building the latest master branch on FreeBSD 9.1 fails ---------------------------------+------------------------------------------ Reporter: kazu-yamamoto | Owner: pgj Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 7.7 Keywords: | Os: FreeBSD Architecture: Unknown/Multiple | Failure: Building GHC failed Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Comment(by kazu-yamamoto): I made a mistake. I built GHC on a tree where I modified ghc.mk. I built GHC again on a vanilla tree. I will attach a log. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#7592: Building the latest master branch on FreeBSD 9.1 fails ---------------------------------+------------------------------------------ Reporter: kazu-yamamoto | Owner: pgj Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 7.7 Keywords: | Os: FreeBSD Architecture: Unknown/Multiple | Failure: Building GHC failed Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Comment(by igloo): Hmm, on line 3039 of the log `inplace/bin/ghc-cabal` is created: {{{ Invoking recipe from utils/ghc-cabal/ghc.mk:22 to update target `inplace/bin/ghc-cabal'. "cp" utils/ghc-cabal/dist/build/tmp/ghc-cabal inplace/bin/ghc-cabal }}} but then on line 5291 it appears to be out-of-date and gets rebuilt: {{{ Prerequisite `utils/ghc-cabal/dist/build/tmp/ghc-cabal' is newer than target `inplace/bin/ghc-cabal'. Prerequisite `inplace/bin//.' is order-only for target `inplace/bin /ghc-cabal'. Must remake target `inplace/bin/ghc-cabal'. Need a job token; we don't have children Invoking recipe from utils/ghc-cabal/ghc.mk:22 to update target `inplace/bin/ghc-cabal'. "cp" utils/ghc-cabal/dist/build/tmp/ghc-cabal inplace/bin/ghc-cabal }}} I can't see any reason for it being out-of-date. Please could you try modifying the `GHC_CABAL_INPLACE` rule on line 21 of `utils/ghc- cabal/ghc.mk` to this: {{{ $(GHC_CABAL_INPLACE) : $(GHC_CABAL_DIR)/dist/build/tmp/ghc-cabal$(exeext) | $$(dir $$@)/. -stat $< -stat $@ "$(CP)" $< $@ -stat $< -stat $@ }}} and do a build? Perhaps the output will give some insight. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#7592: Building the latest master branch on FreeBSD 9.1 fails ---------------------------------+------------------------------------------ Reporter: kazu-yamamoto | Owner: pgj Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 7.7 Keywords: | Os: FreeBSD Architecture: Unknown/Multiple | Failure: Building GHC failed Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Comment(by kazu-yamamoto): Attached. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#7592: Building the latest master branch on FreeBSD 9.1 fails ---------------------------------+------------------------------------------ Reporter: kazu-yamamoto | Owner: pgj Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 7.7 Keywords: | Os: FreeBSD Architecture: Unknown/Multiple | Failure: Building GHC failed Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Comment(by igloo): Here are the stat outputs: {{{ First time rules fires: Before copy: 100 10437839 -rwxr-xr-x 1 kazu kazu 20851248 9446798 "Feb 3 05:22:22 2013" "Feb 3 05:22:22 2013" "Feb 3 05:22:22 2013" "Feb 3 05:22:21 2013" 32768 18560 0 utils/ghc-cabal/dist/build/tmp/ghc-cabal (inplace/bin/ghc-cabal doesn't exist) After copy: 100 10437839 -rwxr-xr-x 1 kazu kazu 20851248 9446798 "Feb 3 05:22:22 2013" "Feb 3 05:22:22 2013" "Feb 3 05:22:22 2013" "Feb 3 05:22:21 2013" 32768 18560 0 utils/ghc-cabal/dist/build/tmp/ghc-cabal 100 9395816 -rwxr-xr-x 1 kazu kazu 18824736 9446798 "Feb 3 05:22:22 2013" "Feb 3 05:22:22 2013" "Feb 3 05:22:22 2013" "Feb 3 05:22:22 2013" 32768 18560 0 inplace/bin/ghc-cabal Second time rules fires: Before copy: 100 10437839 -rwxr-xr-x 1 kazu kazu 20851248 9446798 "Feb 3 05:22:22 2013" "Feb 3 05:22:22 2013" "Feb 3 05:22:22 2013" "Feb 3 05:22:21 2013" 32768 18560 0 utils/ghc-cabal/dist/build/tmp/ghc-cabal 100 9395816 -rwxr-xr-x 1 kazu kazu 18824736 9446798 "Feb 3 05:22:48 2013" "Feb 3 05:22:22 2013" "Feb 3 05:22:22 2013" "Feb 3 05:22:22 2013" 32768 18560 0 inplace/bin/ghc-cabal After copy: 100 10437839 -rwxr-xr-x 1 kazu kazu 20851248 9446798 "Feb 3 05:22:50 2013" "Feb 3 05:22:22 2013" "Feb 3 05:22:22 2013" "Feb 3 05:22:21 2013" 32768 18560 0 utils/ghc-cabal/dist/build/tmp/ghc-cabal 100 9395816 -rwxr-xr-x 1 kazu kazu 18821696 9446798 "Feb 3 05:22:48 2013" "Feb 3 05:22:50 2013" "Feb 3 05:22:50 2013" "Feb 3 05:22:22 2013" 32768 18560 0 inplace/bin/ghc-cabal }}} I can't see anything wrong there. I've just looked at the make 3.82 code, and it certainly looks like a dependency needs to be strictly newer than the target for it to be considered changed: {{{ d->changed |= noexist || d_mtime > this_mtime; }}} I think this will need someone who can reproduce the problem to diagnose exactly what's going on (it might be easiest to make a cut-down testcase first). One possibility is that the filesystem has sub-second precision, `stat` is ignoring the extra precision, and `cp` is giving inconsistent times (perhaps truncating the extra precision in the file it creates). Another is that the `stat` syscall is giving the wrong result for some reason. It's also not impossible that this is a `make` bug. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#7592: Building the latest master branch on FreeBSD 9.1 fails ---------------------------------+------------------------------------------ Reporter: kazu-yamamoto | Owner: pgj Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 7.7 Keywords: | Os: FreeBSD Architecture: Unknown/Multiple | Failure: Building GHC failed Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Comment(by kazu-yamamoto): Should we contact Paul Graphov? http://www.haskell.org/pipermail/glasgow-haskell- users/2012-March/022150.html -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592#comment:13 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#7592: Building the latest master branch on FreeBSD 9.1 fails ---------------------------------+------------------------------------------ Reporter: kazu-yamamoto | Owner: pgj Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 7.7 Keywords: | Os: FreeBSD Architecture: Unknown/Multiple | Failure: Building GHC failed Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Comment(by graphov): Hi. I'll try to reproduce it in OpenIndiana at the weekend if needed.[[BR]] Also my machine was really slow (it was virtual machine run on old hardware) and if I remember well, I didn't use -j at all because VM had only one hardware core assigned. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592#comment:14 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#7592: Building the latest master branch on FreeBSD 9.1 fails ---------------------------------+------------------------------------------ Reporter: kazu-yamamoto | Owner: pgj Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 7.7 Keywords: | Os: FreeBSD Architecture: Unknown/Multiple | Failure: Building GHC failed Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Comment(by pgj): Replying to [comment:12 igloo]:
I think this will need someone who can reproduce the problem to diagnose exactly what's going on (it might be easiest to make a cut-down testcase first). One possibility is that the filesystem has sub-second precision, `stat` is ignoring the extra precision, and `cp` is giving inconsistent times (perhaps truncating the extra precision in the file it creates). Another is that the `stat` syscall is giving the wrong result for some reason. It's also not impossible that this is a `make` bug.
I am not sure if this helps, but my attention has just been called to that precision of file-system timestamps can be set by the {{{vfs.timestamp_precision}}} sysctl(3) variable. This is {{{0}}} by default, which means "seconds", but increasing the value could increase the precision as well. (Use {{{sysctl -d vfs.timestamp_precision}}} to see them.) -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592#comment:15 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#7592: Building the latest master branch on FreeBSD 9.1 fails ---------------------------------+------------------------------------------ Reporter: kazu-yamamoto | Owner: pgj Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 7.7 Keywords: | Os: FreeBSD Architecture: Unknown/Multiple | Failure: Building GHC failed Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Comment(by kazu-yamamoto): Great! {{{ % sudo -w vfs.timestamp_precision=1 }}} solves this problem. I think that displaying a warning message is useful for FreeBSD users. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592#comment:16 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#7592: Building the latest master branch on FreeBSD 9.1 fails ---------------------------------+------------------------------------------ Reporter: kazu-yamamoto | Owner: igloo Type: bug | Status: new Priority: normal | Milestone: 7.8.1 Component: Build System | Version: 7.7 Keywords: | Os: FreeBSD Architecture: Unknown/Multiple | Failure: Building GHC failed Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Changes (by igloo): * owner: pgj => igloo * milestone: => 7.8.1 -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592#comment:17 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#7592: Building the latest master branch on FreeBSD 9.1 fails ---------------------------------+------------------------------------------ Reporter: kazu-yamamoto | Owner: igloo Type: bug | Status: new Priority: normal | Milestone: 7.8.1 Component: Build System | Version: 7.7 Keywords: | Os: FreeBSD Architecture: Unknown/Multiple | Failure: Building GHC failed Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Comment(by pgj): Replying to [comment:16 kazu-yamamoto]:
I think that displaying a warning message is useful for FreeBSD users.
I have added a paragraph on this to the [wiki:Building/Troubleshooting build troubleshooting] page on the wiki. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592#comment:18 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#7592: Building the latest master branch on FreeBSD 9.1 fails
---------------------------------+------------------------------------------
Reporter: kazu-yamamoto | Owner: igloo
Type: bug | Status: new
Priority: normal | Milestone: 7.8.1
Component: Build System | Version: 7.7
Keywords: | Os: FreeBSD
Architecture: Unknown/Multiple | Failure: Building GHC failed
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
---------------------------------+------------------------------------------
Comment(by ian@…):
commit 83a9f4f4cc3d1358d76a4b3815f0d567560b35e7
{{{
Author: Ian Lynagh
#7592: Building the latest master branch on FreeBSD 9.1 fails ----------------------------------+----------------------------------------- Reporter: kazu-yamamoto | Owner: igloo Type: bug | Status: closed Priority: normal | Milestone: 7.8.1 Component: Build System | Version: 7.7 Resolution: fixed | Keywords: Os: FreeBSD | Architecture: Unknown/Multiple Failure: Building GHC failed | Difficulty: Unknown Testcase: | Blockedby: Blocking: | Related: ----------------------------------+----------------------------------------- Changes (by igloo): * status: new => closed * resolution: => fixed Comment: I've added a link to the troubleshooting wiki page in the error message. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7592#comment:20 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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