On Fri, 2008-10-10 at 09:08 -0700, Duncan Coutts wrote:
Data/Time/Clock/CTimeval.hs:1:11: Warning: -ffi is deprecated: use -XForeignFunctionInterface or pragma {-# LANGUAGE ForeignFunctionInterface#-} instead
<no location info>: Failing due to -Werror.
NOOOOooooooooooooooooooo!!!!!!
This is the reason that hackage now rejects the use of -Werror in released packages. It causes unnecessary breakage when new compilers add new warnings.
Warnings in a build process should be fixed, not ignored (and, I would say, fixed by whoever introduced the warning or otherwise broke the build). Hackage, on the other hand, is right to reject -Werror in .cabal files, as there the build is really part of the install process and should be as lenient as possible. I pass --ghc-options="-Wall -Werror" to cabal in a Makefile in most of my projects, so that my development build process is strict. -- Ashley Yakeley