Unexpected failures on Travis

[Richard Eisenberg]

The TH_Roles tests both use `runIO` inside of a TH splice to spit out some stuff. It seems (even on my machine) that when output is redirected, the result of a `runIO` is suppressed. For example, when I compile

> {-# LANGUAGE TemplateHaskell #-}
> module Scratch where
> 
> import Language.Haskell.TH
> 
> $( do runIO $ putStrLn "hi there"
>       return [] )
> 
I get an output include "hi there" when I run ghc normally, but

prompt> ghc -c Scratch.hs >stdout.txt

leaves me with no output to my terminal, and a stdout.txt that lists only the loaded libraries, no "hi there".

I would guess that the problem on Travis is closely related. Does anyone know more about this output suppression?

Thanks,
Richard

On Oct 18, 2013, at 2:29 PM, Joachim Breitner wrote:

> Hi,
> 
> my inofficial travis build of GHC produced reliably these test suite
> failures. These do not occur when I use my regular GHC development tree,
> but they do occur with the settins of travis.
> 
> The settings include
>        echo 'GhcLibWays = v'          >> mk/build.mk
> so I’m inclined to put 
>        unless(have_dynamic(),skip)
> to all these tests, but maybe someone with better understanding of
> theses issues could comment on them first?
> 
> The failures I am talking about are
> 
>        Unexpected failures:
>           ghc-api/T7478   T7478 [bad exit code] (normal)
>           plugins         plugins06 [exit code non-0] (normal)
>           quasiquotation  T7918 [bad exit code] (normal)
>           th              TH_Roles3 [stderr mismatch] (normal)
>           th              TH_Roles4 [stderr mismatch] (normal)
> 
> and the error messages in detail can be found on
> https://s3.amazonaws.com/archive.travis-ci.org/jobs/12722962/log.txt
> 
> To reproduce this, simply run
>        git https://github.com/nomeata/ghc-complete.git
>        cd ghc-complete
>        ./validate.sh
> 
> Thanks,
> Joachim
> 
> 
> -- 
> Joachim “nomeata” Breitner
>  mail at joachim-breitner.de • http://www.joachim-breitner.de/
>  Jabber: nomeata at joachim-breitner.de  • GPG-Key: 0x4743206C
>  Debian Developer: nomeata at debian.org
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