Cabal build depends and if cpp-options
gracjanpolak at gmail.com
Wed Feb 10 04:51:13 EST 2010
Malcolm Wallace <malcolm.wallace <at> cs.york.ac.uk> writes:
> Flag foo
> if foo
> build-depends: base >=4 && <=5
> cpp-options: -DUSE_BASE_4
> build-depends: base >=3 && <4
> cpp-options: -DUSE_BASE_3
This seems to be classic solution.
I have a library that could accommodate to whatever base it compiles with. But
that base version number depends on the requirements of the program or of all
the other libraries involved.
Therefore I imagine that:
1. dependency solver will pick base version that satisfies all of the constraints
2. tells my library which one has been chosen for this particular build
3. my lib happily compiles
Look ma! No flags!
How to do
cabal install MyProg
where MyProg depends on MyLib but with particular MyFlag set?
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