Josh Triplett wrote:
> That looks like Alex's own lexer, used to build Alex; adding
> BangPatterns there seems like the wrong fix, and it *only* fixes Alex
> itself, not other users of Alex.
Ah, right.
> Instead, Alex should automatically add
> {-# LANGUAGE BangPatterns #-} to the generated lexer (or rather, extend
> the existing LANGUAGE pragma to include BangPatterns) when it uses
> BangPatterns (specifically, when using -g). That would avoid forcing
> the project that uses Alex to know that it needs BangPatterns
> internally.
Ok, I'll purse that issue.
> Projects using Cabal automatically invoke alex with -g when building
> with GHC, so this change breaks any project using Cabal and Alex (or any
> other project using -g). A quick search turns up various build logs
> (from Debian packages and otherwise) of lexers failing to build with
> this error.
>
> Also, I hope that the fixed version of this patch can go upstream to fix
> other users of alex, since otherwise a project building on Debian and
> using -Wall -Werror will fail to build when not using Debian alex.
I have definitely tried:
http://trac.haskell.org/haskell-platform/ticket/141
http://trac.haskell.org/haskell-platform/ticket/171
Apparently this will be fixed in ghc-7.2 which should be released
around september this year.
Erik
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Erik de Castro Lopo
http://www.mega-nerd.com/
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