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 <[email protected]>
*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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