Thanks Heinrich! That sounds like the ideal solution. I'll do that.
On 29 January 2014 10:55, Heinrich Apfelmus
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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