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#16Build fails with GHC 7.2.1

Oleg Grenrus

https://travis-ci.org/haskell-compat/base-compat/jobs/98793911

Preprocessing library transformers-0.5.0.0... [ 1 of 28] Compiling Control.Monad.Trans.Class ( Control/Monad/Trans/Class.hs, dist/build/Control/Monad/Trans/Class.o ) Implicit import declaration: base:Prelude can't be safely imported! The package (base) the module resides in isn't trusted. Failed to install transformers-0.5.0.0

• Ryan ScottFri Dec 25 19:38:01 UTC 2015

  This isn't really the fault of transformers. It's due to an old GHC 7.2.1-specific bug where no packages were marked as trusted by default. The workaround is to just invoke ghc-pkg trust base before compiling transformers. On Travis-CI, this snippet ( https://github.com/judah/haskeline/blob/bc443ea45a186f5e55811f259b4b3048a8f9edea/.travis.yml#L31 ) usually does the trick.

• Oleg GrenrusFri Dec 25 19:39:49 UTC 2015
  • status set to closed

  Ok cool. TIL.