Bug 1765811

Summary:	ghc panics building git-annex on >30 armv7hl
Product:	[Fedora] Fedora	Reporter:	Elliott Sales de Andrade <quantum.analyst>
Component:	ghc	Assignee:	Jens Petersen <petersen>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	rawhide	CC:	petersen
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Last Closed:	2020-02-01 09:07:48 UTC	Type:	Bug
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Description Elliott Sales de Andrade 2019-10-26 08:18:02 UTC

Description of problem:
Building the latest git-annex fails on F31: https://koji.fedoraproject.org/koji/taskinfo?taskID=38557890
and Rawhide: https://koji.fedoraproject.org/koji/taskinfo?taskID=38557895
but not F30: https://koji.fedoraproject.org/koji/taskinfo?taskID=38557889


Version-Release number of selected component (if applicable):
8.6.5-100.fc31


Steps to Reproduce:
1. Build git-annex on F31 or Rawhide


Actual results:
[565 of 628] Compiling Assistant.WebApp.Types ( Assistant/WebApp/Types.hs, dist/build/git-annex/git-annex-tmp/Assistant/WebApp/Types.o )
ghc: panic! (the 'impossible' happened)
  (GHC version 8.6.5 for arm-unknown-linux):
	tyThingTyCon
  Identifier ‘$tcT1’
  Call stack:
      CallStack (from HasCallStack):
        callStackDoc, called at compiler/utils/Outputable.hs:1160:37 in ghc:Outputable
        pprPanic, called at compiler/main/HscTypes.hs:2165:28 in ghc:HscTypes
Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug


Expected results:
Build is fine.

Comment 1 Jens Petersen 2020-02-01 08:21:12 UTC

Sorry, only just noticed this now...

It looks like the original problem fixed itself, however:

[566 of 629] Compiling Assistant.WebApp.Types ( Assistant/WebApp/Types.hs, dist/build/git-annex/git-annex-tmp/Assistant/WebApp/Types.o )
Assistant/WebApp/Types.hs:49:37: error:
    • Identifier ‘String’ used as a type
    • In the first argument of ‘IO’, namely ‘String’
      In the first argument of ‘Maybe’, namely ‘(IO String)’
      In the type ‘Maybe (IO String)’
   |
49 |         , postFirstRun :: Maybe (IO String)
   |                                     ^^^^^^

However it seems to build okay with -O1 (ie with the `Production` flag set to `False`).

It might better to move and rename this bug, open a new bug against git-annex, or close it now with -O1.

Comment 2 Jens Petersen 2020-02-01 09:07:48 UTC

In the end I opened bug 1797176.

So I will close out this original bug for the ghc compiler crash.