Cabal developers, Joachim Breitner writes:

Am Sonntag, den 16.08.2009, 17:47 +0100 schrieb Neil Mitchell:

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trying to build hlint does not work on some architectures (at least alpha, s390, mips) where no threaded RTS is available. An example build log is available at http://buildd.debian.org/build.php?arch=alpha&pkg=hlint&ver=1.6.4-1

This is caused by ghc-options: -fno-warn-overlapping-patterns -threaded in your hlint.cabal file. [..] If not, would it be possible to make this option dependent on the availability of a threaded RTS (either by direct support in cabal for checking it, similar to os(..) checks, or by passing a "-fthreaded" flag to setup configure)?

Yes, of course. What suits you? Any os checks would go wrong, so an -fnothreaded flag seems sensible? I'd still like threading to be the default.

that would be a start, thanks.

Of course I’d prefer if cabal had automatic support for this. I guess is does not ATM, so for now the flag is ok, and I’m hereby telling the Cabal people about this :-)

Did a trac ticket ever get created for this? This affects Darcs 2.3.0, so I'm about to add an -f-threaded to darcs.cabal for 2.4.0, because I don't know how to tell Cabal "use -threaded iff you can".