February 2015 - ghc-tickets

[GHC] #8928: 64-bit statically linked binary consumes all memory while spinning on 'SIGVTALRM's
by GHC 20 Apr '15

20 Apr '15

#8928: 64-bit statically linked binary consumes all memory while spinning on 'SIGVTALRM's ----------------------------------+---------------------------------- Reporter: cswarth | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Keywords: | Operating System: Linux Architecture: x86_64 (amd64) | Type of failure: Runtime crash Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ----------------------------------+---------------------------------- I actually have no idea if this is a haskell bug or not, but since the earlier reported symptoms are similar, and the "pandoc" program is compiled with GHC, I thought I would report it here as well. This situation sounds exactly like [https://ghc.haskell.org/trac/ghc/ticket/7344 this bug] reported 17 months ago. Symptoms are 'pandoc --version' hangs and consumes memory until the process eventually dies with an OOM error. This seems to only happen when LC_ALL is set in the environment, and only when running the statically linked pandoc. {{{ $ uname -a Linux server 3.5.0-43-generic #66~precise1-Ubuntu SMP Thu Oct 24 14:52:23 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux $ wget https://s3.amazonaws.com/rstudio-buildtools/pandoc-1.12.3.zip $ unzip pandoc-1.12.3.zip $ file pandoc-1.12.3/linux/debian/x86_64/pandoc pandoc-1.12.3/linux/debian/x86_64/pandoc: ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux), statically linked, for GNU/Linux 2.6.15, BuildID[sha1]=0x9bc69f51b7c213cf58e9f8692f4b46f9f05fb723, not stripped $ LC_ALL=C strace -e trace=open,close pandoc-1.12.3/linux/debian/x86_64/pandoc --version open("/usr/lib/gconv/gconv-modules.cache", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/lib/gconv/gconv-modules", O_RDONLY) = -1 ENOENT (No such file or directory) --- SIGVTALRM (Virtual timer expired) @ 0 (0) --- --- SIGVTALRM (Virtual timer expired) @ 0 (0) --- --- SIGVTALRM (Virtual timer expired) @ 0 (0) --- --- SIGVTALRM (Virtual timer expired) @ 0 (0) --- ^C--- SIGINT (Interrupt) @ 0 (0) --- }}} Note this problem does not occur if I run an older dynamically linked pandoc under the same circumstances. {{{ $ /usr/bin/pandoc --version pandoc 1.9.1.1 Compiled with citeproc-hs 0.3.4, texmath 0.6.0.3, highlighting-kate 0.5.0.5. Syntax highlighting is supported for the following languages: Actionscript, Ada, Alert, Alert_indent, Apache, Asn1, Asp, Awk, Bash, Bibtex, Boo, C, Changelog, Clojure, Cmake, Coffeescript, Coldfusion, Commonlisp, Cpp, Cs, Css, D, Diff, Djangotemplate, Doxygen, Dtd, Eiffel, ... }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8928> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9745: qual_pkg panic with template haskell
by GHC 20 Apr '15

20 Apr '15

#9745: qual_pkg panic with template haskell -------------------------------------+------------------------------------- Reporter: luite | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.9 Keywords: | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Unknown | Type of failure: Blocked By: | None/Unknown Related Tickets: | Test Case: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- I'm updating some things that use Template Haskell to derive lenses to work with GHC HEAD, but I'm getting the following error. My `cabal- install` a fresh build from the master branch of the `cabal` repository. {{{ src/Lib.hs:11:1:ghc: panic! (the 'impossible' happened) (GHC version 7.9.20141029 for x86_64-unknown-linux): qual_pkg lens-4.5.0.0.1 }}} lenstest.cabal {{{ name: lenstest version: 0.1.0.0 license-file: LICENSE author: Luite Stegeman maintainer: stegeman(a)gmail.com build-type: Simple cabal-version: >=1.10 library build-depends: base >= 4.8 && < 4.9, lens >= 4.5 exposed-modules: Lib default-language: Haskell2010 hs-source-dirs: src }}} src/Lib.hs: {{{#!hs {-# LANGUAGE TemplateHaskell #-} module Lib where import Control.Lens data XY = X Int | Y String makeLenses ''XY makePrisms ''XY }}} The `lens` and `free` packages need to be patched to work with the latest GHC, because of a conflict with `Data.Bifunctor`. I've attached updated version that use `PackageImports` to get the module from `bifunctors` as a workaround. Use {{{ cabal install --allow-newer }}} to install, since some dependencies have too restrictive upper bounds. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9745> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #10124: Simple case analyses generate too many branches
by GHC 20 Apr '15

20 Apr '15

#10124: Simple case analyses generate too many branches -------------------------------------+------------------------------------- Reporter: bgamari | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.4 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Take the following example, {{{#!hs f :: Int -> Bool f a = case a of 1 -> True 5 -> True 8 -> True 9 -> True 11 -> True 19 -> True _ -> False {-# NOINLINE f #-} main = print $ f 8 }}} This gets lowered to the following Core (by GHC 7.8), {{{#!hs f f = \ a_s3EH -> case a_s3EH of _ { I# ds_s3EJ -> case ds_s3EJ of _ { __DEFAULT -> False; 1 -> True; 5 -> True; 8 -> True; 9 -> True; 11 -> True; 19 -> True } } }}} I have expected GHC to lower this into a nice string of logical operations, with perhaps a couple of branches at the end to determine the result. Unfortunately, this is not what happens. Instead the C-- is a sea of branches, {{{ c3F7: _s3EK::I64 = I64[R1 + 7]; if (%MO_S_Lt_W64(_s3EK::I64, 9)) goto c3Fz; else goto c3FA; c3Fz: if (%MO_S_Lt_W64(_s3EK::I64, 5)) goto c3Fq; else goto c3Fr; c3Fq: if (_s3EK::I64 != 1) goto c3Ff; else goto c3Fg; c3Fr: if (%MO_S_Lt_W64(_s3EK::I64, 8)) goto c3Fn; else goto c3Fo; c3Fn: if (_s3EK::I64 != 5) goto c3Ff; else goto c3Fg; c3Fo: if (_s3EK::I64 != 8) goto c3Ff; else goto c3Fg; c3FA: if (%MO_S_Lt_W64(_s3EK::I64, 11)) goto c3Fw; else goto c3Fx; c3Fw: if (_s3EK::I64 != 9) goto c3Ff; else goto c3Fg; c3Fx: if (%MO_S_Lt_W64(_s3EK::I64, 19)) goto c3Ft; else goto c3Fu; c3Ft: if (_s3EK::I64 != 11) goto c3Ff; else goto c3Fg; c3Fu: if (_s3EK::I64 != 19) goto c3Ff; else goto c3Fg; c3Ff: R1 = False_closure+1; Sp = Sp + 8; call (P64[Sp])(R1) args: 8, res: 0, upd: 8; c3Fg: R1 = True_closure+2; Sp = Sp + 8; call (P64[Sp])(R1) args: 8, res: 0, upd: 8; ... }}} Which gets turned into the branchy assembler that you would expect. To my surprise even the LLVM backend isn't able to bring this back into a branchless form. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10124> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9056: --make paths are not deduplicated
by GHC 19 Apr '15

19 Apr '15

#9056: --make paths are not deduplicated -------------------------+------------------------------------------------- Reporter: | Owner: evincarofautumn | Status: new Type: bug | Milestone: Priority: | Version: 7.8.2 normal | Operating System: Unknown/Multiple Component: | Type of failure: Incorrect warning at Compiler | compile-time Keywords: | Test Case: Architecture: | Blocking: Unknown/Multiple | Difficulty: | Unknown | Blocked By: | Related Tickets: | -------------------------+------------------------------------------------- I had a build script with an accidental duplicate dependency, which caused GHC to be run like so: {{{ ghc --make Main.hs Main.hs }}} This results in a spurious error from `GhcMake.checkDuplicates`: {{{ <no location info>: module ‘main:Main’ is defined in multiple files: Main.hs Main.hs }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9056> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #10021: Add "Error:" prefix for error-messages
by GHC 19 Apr '15

19 Apr '15

#10021: Add "Error:" prefix for error-messages -------------------------------------+------------------------------------- Reporter: k-bx | Owner: Type: feature | Status: new request | Milestone: 7.12.1 Priority: normal | Version: 7.8.4 Component: Compiler | Operating System: Unknown/Multiple Keywords: | Type of failure: None/Unknown Architecture: | Blocked By: Unknown/Multiple | Related Tickets: Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Similar to what we have for "Warning:". E.g., we have: {{{ ➜ cat test.hs main = putStrLn "Hello!" ➜ ghc --make -fforce-recomp -Wall ./test.hs [1 of 1] Compiling Main ( test.hs, test.o ) test.hs:1:1: Warning: Top-level binding with no type signature: main :: IO () Linking test ... ➜ cat test2.hs main = foo ➜ ghc --make -fforce-recomp -Wall ./test2.hs [1 of 1] Compiling Main ( test2.hs, test2.o ) test2.hs:1:8: Not in scope: ‘foo’ }}} And I propose having: {{{ ➜ cat test2.hs main = foo ➜ ghc --make -fforce-recomp -Wall ./test2.hs [1 of 1] Compiling Main ( test2.hs, test2.o ) test2.hs:1:8: Error: Not in scope: ‘foo’ }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10021> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9809: Overwhelming the TimerManager
by GHC 17 Apr '15

17 Apr '15

#9809: Overwhelming the TimerManager -------------------------------------+------------------------------------- Reporter: fryguybob | Owner: simonmar Type: bug | Status: new Priority: normal | Milestone: Component: Runtime System | Version: 7.9 Keywords: | Operating System: Linux Architecture: Unknown/Multiple | Type of failure: Runtime Difficulty: Unknown | performance bug Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- I was talking on IRC with davean about an issue that potentially could have been related to STM (I don't think it is at all after investigating) and I reduced the issue to the following program: {{{#!hs -- Main.hs module Main where import Control.Monad import Control.Concurrent import Control.Concurrent.STM import System.Environment main :: IO () main = do as <- getArgs case as of ["-f"] -> replicateM_ 100000 . void . forkIO . void $ registerDelay 10 _ -> replicateM_ 100000 . void $ registerDelay 10 threadDelay 1000 }}} This ends up registering a lot of events with the TimerManager. With the "-f" flag it does so from many threads and when run that way it appears to eventually overwhelm the TimerManager and causing over 350 MB total memory in use. {{{ $ ghc --version The Glorious Glasgow Haskell Compilation System, version 7.9.20141115 $ ghc -O2 -threaded -debug Main.hs -o Main-head ... $ ./Main-head -f +RTS -s 3,566,966,936 bytes allocated in the heap 4,200,021,784 bytes copied during GC 118,273,720 bytes maximum residency (96 sample(s)) 12,649,480 bytes maximum slop 354 MB total memory in use (0 MB lost due to fragmentation) Tot time (elapsed) Avg pause Max pause Gen 0 6350 colls, 0 par 2.430s 2.434s 0.0004s 0.0073s Gen 1 96 colls, 0 par 7.438s 7.441s 0.0775s 0.2526s TASKS: 4 (1 bound, 3 peak workers (3 total), using -N1) SPARKS: 0 (0 converted, 0 overflowed, 0 dud, 0 GC'd, 0 fizzled) INIT time 0.002s ( 0.002s elapsed) MUT time 0.461s ( 0.460s elapsed) GC time 9.869s ( 9.875s elapsed) EXIT time 0.003s ( 0.003s elapsed) Total time 10.336s ( 10.340s elapsed) Alloc rate 7,741,472,461 bytes per MUT second Productivity 4.5% of total user, 4.5% of total elapsed gc_alloc_block_sync: 0 whitehole_spin: 0 gen[0].sync: 0 gen[1].sync: 0 }}} Running without forking many threads and the total memory in use stays low (3 MB). {{{ 154,305,648 bytes allocated in the heap 16,922,272 bytes copied during GC 1,378,608 bytes maximum residency (3 sample(s)) 28,520 bytes maximum slop 3 MB total memory in use (0 MB lost due to fragmentation) Tot time (elapsed) Avg pause Max pause Gen 0 298 colls, 0 par 0.056s 0.056s 0.0002s 0.0015s Gen 1 3 colls, 0 par 0.005s 0.005s 0.0017s 0.0047s TASKS: 4 (1 bound, 3 peak workers (3 total), using -N1) SPARKS: 0 (0 converted, 0 overflowed, 0 dud, 0 GC'd, 0 fizzled) INIT time 0.001s ( 0.001s elapsed) MUT time 0.148s ( 0.148s elapsed) GC time 0.061s ( 0.061s elapsed) EXIT time 0.000s ( 0.000s elapsed) Total time 0.211s ( 0.210s elapsed) Alloc rate 1,042,557,595 bytes per MUT second Productivity 70.8% of total user, 71.2% of total elapsed gc_alloc_block_sync: 0 whitehole_spin: 0 gen[0].sync: 0 gen[1].sync: 0 }}} Using 7.6.3, things don't get out of hand, also with 3 MB total memory use. {{{ $ ./Main-7.6.3 -f +RTS -s 213,519,392 bytes allocated in the heap 116,111,712 bytes copied during GC 505,080 bytes maximum residency (11 sample(s)) 113,032 bytes maximum slop 3 MB total memory in use (0 MB lost due to fragmentation) Tot time (elapsed) Avg pause Max pause Gen 0 403 colls, 0 par 0.33s 0.33s 0.0008s 0.0028s Gen 1 11 colls, 0 par 0.01s 0.01s 0.0011s 0.0019s TASKS: 3 (1 bound, 2 peak workers (2 total), using -N1) SPARKS: 0 (0 converted, 0 overflowed, 0 dud, 0 GC'd, 0 fizzled) INIT time 0.00s ( 0.00s elapsed) MUT time 1.99s ( 1.50s elapsed) GC time 0.34s ( 0.34s elapsed) EXIT time 0.00s ( 0.00s elapsed) Total time 2.33s ( 1.84s elapsed) Alloc rate 107,426,859 bytes per MUT second Productivity 85.5% of total user, 108.1% of total elapsed gc_alloc_block_sync: 0 whitehole_spin: 0 gen[0].sync: 0 gen[1].sync: 0 }}} I looked for causes and eliminated any `STM` interactions causing problems (`STM` shows up in the `Unique` values and in creating a `TVar` for the registered delay) but did discover that the `emTimeouts` queue gets very large at some point when executing with "-f". If I print the size of `expired` on this line: https://github.com/ghc/ghc/blob/021b7978d14799bae779907faf7490cfd21b3f46/li… I end up seeing somewhere from 4 to 20 events for a while then eventually it jumps up to 80000 or so. Perhaps davean can chime in about the particular use case that he has that I reduced to this simple program for a more real world use. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9809> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #10090: Building ghc with "make -j12" gives different ABI hashes for base to "make -j8"
by GHC 17 Apr '15

17 Apr '15

#10090: Building ghc with "make -j12" gives different ABI hashes for base to "make -j8" -------------------------------------+------------------------------------- Reporter: | Owner: juhpetersen | Status: new Type: bug | Milestone: Priority: normal | Version: 7.8.4 Component: Build | Operating System: Unknown/Multiple System | Type of failure: None/Unknown Keywords: | Blocked By: Architecture: | Related Tickets: Unknown/Multiple | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- While building ghc-7.8.4 for Fedora 22 (devel) I found that doing highly parallel make builds of ghc affects the ABI hash of base, etc. The threshold seems to be between -j8 and -j12, which likely changes the build order of some modules causes changes to ABI hashes. While it is not hard to workaround, it is not really nice so it would be good to track this down IMHO. I haven't seen this kind of issue since 7.4.2 anyway so it may be an indirect buildsystem "regression" with ghc-7.8? -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10090> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9180: New magic function `staticError`
by GHC 16 Apr '15

16 Apr '15

#9180: New magic function `staticError` ------------------------------------+------------------------------------- Reporter: nomeata | Owner: nomeata Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.2 Keywords: | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+------------------------------------- While playing games with `RULES`, I had the need for a way to tell the compiler “please spit out an error message”, in my case if list fusion fails where the user explicitly requested for it. Currently I put an `error "List did not fuse"` in the code using a `RULE`, but what I’d really like to do is to put in a `staticError "List did not fuse"` that, if appearing in Core (say, after the final simplification) causes GHC to abort and print this message. (I’m tempted to use type level strings somehow to make sure that the parameter to `staticError` is not present at the value level, and also that the string is easier to obtain. I’ll see.) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9180> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8391: FunDeps coverage condition check failure with PolyKinds
by GHC 15 Apr '15

15 Apr '15

#8391: FunDeps coverage condition check failure with PolyKinds ----------------------------+---------------------------------------------- Reporter: sbarclay | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.7 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: GHC rejects valid program Unknown/Multiple | Test Case: Difficulty: Unknown | Blocking: Blocked By: | Related Tickets: #8356 | ----------------------------+---------------------------------------------- The following code: {{{ #!haskell {-# LANGUAGE FunctionalDependencies, FlexibleInstances, UndecidableInstances, TypeFamilies, PolyKinds #-} module FunDepsIssue where type Foo a = a class Foo a ~ b => Bar a b | a -> b instance Foo a ~ b => Bar a b }}} results in: {{{ Illegal instance declaration for ‛Bar k a b’ Multiple uses of this instance may be inconsistent with the functional dependencies of the class. In the instance declaration for ‛Bar a b’ }}} This appears to be a regression from 7.6.3, where it compiles OK. The same error occurs when the type synonym is replaced with a type family (which is the case I was originally interested in) or a type constructor like `Data.Proxy`, as long as it's poly-kinded it seems. So the following cases also fail to compile: {{{ #!haskell type family Foo (a :: k) :: * type family Foo (a :: *) :: k type family Foo (a :: k) :: k type family Foo (a :: k) :: k' }}} Looking through the source code, I think that the issue is that the coverage condition check doesn't close over kind variables, when it compares the vars on each side of the functional dependency. But `Foo a` has a hidden kind variable, so the l.h. varset `{a}` is insufficient to fix `b` using `Foo a ~ b`. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8391> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #8276: Building Haddock documentation panics with perf build on x86_64 Linux
by GHC 14 Apr '15

14 Apr '15

#8276: Building Haddock documentation panics with perf build on x86_64 Linux ----------------------------------+--------------------------------------- Reporter: jstolarek | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Documentation | Version: 7.7 Keywords: | Operating System: Unknown/Multiple Architecture: x86_64 (amd64) | Type of failure: Compile-time crash Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ----------------------------------+--------------------------------------- After setting `BuildFlavor = perf` in `build.mk` compilation ends with a panic: {{{ "/home/luite/buildtest/ghc-clean-buildtest/ghc/inplace/bin/haddock" --odir="libraries/ghc-prim/dist-install/doc/html/ghc-prim" --no-tmp-comp- dir --dump-interface=libraries/ghc-prim/dist-install/doc/html/ghc-prim /ghc-prim.haddock --html --hoogle --title="ghc-prim-0.3.1.0: GHC primitives" --prologue="libraries/ghc-prim/dist-install/haddock- prologue.txt" --optghc=-hisuf --optghc=dyn_hi --optghc=-osuf --optghc=dyn_o --optghc=-hcsuf --optghc=dyn_hc --optghc=-fPIC --optghc=-dynamic --optghc=-H32m --optghc=-O --optghc=-package-name --optghc=ghc-prim-0.3.1.0 --optghc=-hide-all-packages --optghc=-i --optghc=-ilibraries/ghc-prim/. --optghc=-ilibraries/ghc-prim/dist- install/build --optghc=-ilibraries/ghc-prim/dist-install/build/autogen --optghc=-Ilibraries/ghc-prim/dist-install/build --optghc=-Ilibraries/ghc- prim/dist-install/build/autogen --optghc=-Ilibraries/ghc-prim/. --optghc =-optP-include --optghc=-optPlibraries/ghc-prim/dist- install/build/autogen/cabal_macros.h --optghc=-package --optghc=rts-1.0 --optghc=-package-name --optghc=ghc-prim --optghc=-XHaskell98 --optghc=-XCPP --optghc=-XMagicHash --optghc=-XForeignFunctionInterface --optghc=-XUnliftedFFITypes --optghc=-XUnboxedTuples --optghc=-XEmptyDataDecls --optghc=-XNoImplicitPrelude --optghc=-O2 --optghc=-no-user-package-db --optghc=-rtsopts --optghc=-odir --optghc=libraries/ghc-prim/dist-install/build --optghc=-hidir --optghc=libraries/ghc-prim/dist-install/build --optghc=-stubdir --optghc=libraries/ghc-prim/dist-install/build --source- module=src/%{MODULE/./-}.html --source- entity=src/%{MODULE/./-}.html#%{NAME} libraries/ghc- prim/./GHC/Classes.hs libraries/ghc-prim/./GHC/CString.hs libraries/ghc- prim/./GHC/Debug.hs libraries/ghc-prim/./GHC/Magic.hs libraries/ghc-prim /dist-install/build/GHC/PrimopWrappers.hs libraries/ghc- prim/./GHC/PrimWrappers.hs libraries/ghc-prim/./GHC/IntWord64.hs libraries/ghc-prim/./GHC/Tuple.hs libraries/ghc-prim/./GHC/Types.hs libraries/ghc-prim/dist-install/build/autogen/GHC/Prim.hs +RTS -tlibraries /ghc-prim/dist-install/doc/html/ghc-prim/ghc-prim.haddock.t --machine- readable Haddock coverage: 100% ( 1 / 1) in 'GHC.IntWord64' 78% ( 7 / 9) in 'GHC.Types' 3% ( 2 / 63) in 'GHC.Tuple' 0% ( 0 / 3) in 'GHC.Debug' 0% ( 0 /351) in 'GHC.PrimopWrappers' 2% ( 1 / 43) in 'GHC.PrimWrappers' 17% ( 1 / 6) in 'GHC.CString' 31% (170 /540) in 'GHC.Prim' 100% ( 3 / 3) in 'GHC.Magic' 38% ( 6 / 16) in 'GHC.Classes' haddock: internal error: haddock: panic! (the 'impossible' happened) (GHC version 7.7.20130912 for x86_64-unknown-linux): Static flags have not been initialised! Please call GHC.newSession or GHC.parseStaticFlags early enough. Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug make[1]: *** [libraries/ghc-prim/dist-install/doc/html/ghc-prim/ghc- prim.haddock] Error 1 make[1]: *** Waiting for unfinished jobs.... make: *** [all] Error 2 }}} I've seen this problem before, but I thought that it was related to my patch. Now I got it on master branch and Luite reported the same problem on #ghc (log above is actually his). A workaround for this is disabling building of dicumentation in "perf" section of `build.mk`. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8276> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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