Malcolm Wallace
Flag foo
Library if foo build-depends: base >=4 && <=5 cpp-options: -DUSE_BASE_4 else 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? -- Gracjan