building haddock?

[Isaac Jones]

Duncan Coutts <duncan.coutts at worc.ox.ac.uk> writes:

> On Tue, 2006-01-31 at 13:54 +0000, Simon Marlow wrote:
>> Duncan Coutts wrote:
>
>> > We really need a field:
>> > 
>> > cabal-depends: 1.1.4
>> > 
>> > So that older versions of Cabal can say "you need version
>> > ${cabal-depends} of Cabal to build this package".
>> 
>> There is such a field:
>> 
>>    cabal-version: >=1.1.4
>
> Really! I had never seen it.
>
>> but I didn't use it in Haddock (now fixed).  This field doesn't help 
>> with all the backwards compatibility issues, particularly API changes in 
>> the Cabal libraries, as we know (see previous discussions).
>
> Indeed, because by the time the cabal Setup.lhs reads the file it's too
> late. Hence my suggestion in the previous discussions for a cabal
> program that reads the file, decides which version of the Cabal libs to
> use and then builds a setup program and passes control on to that.

Ahem. Cabal-install.

It doesn't read that field yet, though.

peace,

  isaac