Bug#956095: ghc panics when building ghc-lib-parser on armhf (raspberry)

[Andrew Maier]

Package: ghc
Version: 8.8.1+dfsg1+is+8.6.5+dfsg1-3+rpi1
Severity: normal

Dear Maintainer,


   * What led up to the situation?
   I compiled the ghc-lib-parser packages (as a dependency for another
   package using stack and the flags --use-system-ghc)

   * What exactly did you do (or not do) that was effective (or
     ineffective)?

   I have tried to compile with j1 and with --fast (no optimisation) to  limit resources. This made no difference.
   I tried to build the package on it's own with the arguments:

   stack --system-ghc  build ghc-lib-parser --fast --keep-going --keep-tmp-files -v


   
   * What was the outcome of this action?
   So far I have not been able to compile the package


   I get the following output:


   2020-04-07 00:04:35.509894: [info] ghc-lib-parser> [143 of 205] Compiling PatSyn
   2020-04-07 00:04:39.625117: [info] ghc-lib-parser> [144 of 205] Compiling Literal
   2020-04-07 00:05:11.953843: [info] ghc-lib-parser> [145 of 205] Compiling TrieMap
   2020-04-07 00:05:16.701428: [info] ghc-lib-parser> [146 of 205] Compiling HsLit
   2020-04-07 00:05:17.243414: [warn] ghc-lib-parser> ghc: panic! (the 'impossible' happened)
   2020-04-07 00:05:17.243723: [warn] ghc-lib-parser>   (GHC version 8.6.5 for arm-unknown-linux):
   2020-04-07 00:05:17.243985: [warn] ghc-lib-parser>      idInfo 2020-04-07 00:05:17.244208: [warn] ghc-lib-parser>   p_a1om
   2020-04-07 00:05:17.244405: [warn] ghc-lib-parser>   Call stack: 2020-04-07 00:05:17.244607: [warn] ghc-lib-parser>       CallStack
   (from HasCallStack): 2020-04-07 00:05:17.244827: [warn] ghc-lib-parser> callStackDoc, called at compiler/utils/Outputable.hs:1160:37 in ghc:Outputable
   2020-04-07 00:05:17.245074: [warn] ghc-lib-parser>         pprPanic, called at compiler/basicTypes/Var.hs:541:34 in ghc:Var
   2020-04-07 00:05:17.245449: [warn] ghc-lib-parser> 
   2020-04-07 00:05:17.245914: [warn] ghc-lib-parser> Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
   2020-04-07 00:05:17.246348: [warn] ghc-lib-parser> 
   2020-04-07 00:05:18.101968: [error] 
   --  While building package ghc-lib-parser-8.8.0.20190424 using:
         /home/andrew/.stack/setup-exe-cache/arm-linux/Cabal-simple_mPHDZzAJ_2.4.0.1_ghc-8.6.5
         --builddir=.stack-work/dist/arm-linux/Cabal-2.4.0.1 build
         --ghc-options " -fdiagnostics-color=always"
             Process exited with code: ExitFailure 1
   
   * What outcome did you expect instead?
   Successful compilation. 



-- System Information:
Distributor ID:	Raspbian
Description:	Raspbian GNU/Linux bullseye/sid
Release:	testing
Codename:	bullseye
Architecture: armv7l

Kernel: Linux 4.19.57-v7l+ (SMP w/4 CPU cores)
Kernel taint flags: TAINT_CRAP
Locale: LANG=en_US.UTF-8, LC_CTYPE=UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages ghc depends on:
ii  dpkg                              1.19.7
ii  gcc                               4:9.2.1-3.1+rpi1
ii  libatomic1                        10-20200324-1+rpi1
ii  libbsd-dev                        0.10.0-1
ii  libc6                             2.30-4+rpi1
ii  libc6-dev                         2.30-4+rpi1
ii  libffi-dev                        3.3-4
ii  libffi7                           3.3-4
ii  libgmp-dev                        2:6.2.0+dfsg-4
ii  libgmp10                          2:6.2.0+dfsg-4
ii  libncurses-dev [libncurses5-dev]  6.2-1
ii  libtinfo6                         6.2-1
ii  llvm-6.0                          1:6.0.1-12+rpi1

ghc recommends no packages.

Versions of packages ghc suggests:
pn  ghc-doc      <none>
pn  ghc-prof     <none>
pn  haskell-doc  <none>
ii  perl         5.30.0-9

-- no debconf information