[Haskell-cafe] To LLVM or not to LLVM...

Ian Ross ian at skybluetrades.net
Wed Jan 29 09:58:49 UTC 2014

Thanks Heinrich!  That sounds like the ideal solution.  I'll do that.

On 29 January 2014 10:55, Heinrich Apfelmus <apfelmus at quantentunnel.de>wrote:

> Ian Ross wrote:
>> A Cabal flag for the same purpose might make sense, IMHO, if there are
>>> other build parameters that change when compiling with LLVM (like CPP
>>> defines, etc.), but it's my understanding that this is not the case?
>> Right.  I think I'll add a Cabal flag and worry about the reverse
>> dependencies issue if the package ever has any!
> You can specify a cabal flag to be switched on by default. Cabal will then
> switch off the flag automatically if it cannot satisfy the constraints.
> So, if you can add a dependency on the LLVM tools in the "extra-libraries"
> field or elsewhere, you can use this automatic flag assignment to compile
> the LLVM version for people who already have the LLVM tools installed.
> (Note that last time I checked, cabal will not try to download new
> packages in order to fulfill the constraints, though.)
> Best regards,
> Heinrich Apfelmus
> --
> http://apfelmus.nfshost.com
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Ian Ross   Tel: +43(0)6804451378   ian at skybluetrades.net
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