I have added some suggestions about conditional compilation to
https://www.haskell.org/haskellwiki/Cabal/FAQ#Conditional_compilation
Maybe my suggestion about using Hs-Source-Dirs for conditional compilation
can be added to
http://www.haskell.org/cabal/release/cabal-latest/doc/users-guide/authors.html#cpp
I'm confused with a paragraph from
http://www.haskell.org/ghc/docs/latest/html/Cabal/authors.html
"If dependencies were missing, the last flag (as by the order in which
the flags were introduced in the package description) is tried with its
alternative value and so on. This continues until either an assignment is
found where all dependencies can be satisfied, or all possible flag
assignments have been tried."
I assumed that the automatic search for appropriate flag assignments is
only done by cabal-install, not by Cabal.
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