Re: stage2 build fails

Which stage 0 compiler are you using? It seems to be <= 8.10 and still has 8038cbd96f4 merged which seems contradictory. Anyway the alternative seems to be redundant from the beginning and should have been removed IMO. I have opened https://gitlab.haskell.org/ghc/ghc/merge_requests/2564 to fix this. Does it work after applying this patch? Sylvain On 27/01/2020 12:42, Simon Peyton Jones via ghc-devs wrote:

It would be good to know how to fix this.  It’s blocking my builds.

For some reason it doesn’t seem to kill CI

Simon

*From:*Simon Peyton Jones *Sent:* 25 January 2020 20:26 *To:* ghc-devs *Subject:* stage2 build fails

I’m getting this with “sh validate –legacy”

compiler/main/DynFlags.hs:1344:15: error: [-Woverlapping-patterns, -Werror=overlapping-patterns]

    Pattern match is redundant

    In an equation for ‘settings’: settings s | otherwise = ...

     |

1344 |             | otherwise = panic $ "Invalid cfg parameters." ++ exampleString

     |               ^^^^^^^^^

This is when compiling the stage-2 compiler.  There’s an ifdef in DynFlags thus

#if __GLASGOW_HASKELL__ <= 810

            | otherwise = panic $ "Invalid cfg parameters." ++ exampleString

#endif

but somehow it’s not triggering for the stage2 compiler.

Any ideas?  It’s blocking a full build.

This #ifdef was added in 8038cbd96f4, when GHC became better at reporting redundant code.

Simon

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