Setup.hs foils cross-compilation

[ariep]

entropy currently uses a custom Setup.hs to decide whether it can use RDRAND. This means that it cannot be cross-compiled.

From the comments in the cabal file I conclude that it's not possible to make the build-type depend on a flag, is that correct? Having a flag to override this behaviour would help.

Currently the workaround is to locally modify this package (to have build-type: Simple), but that's rather inconvenient.

[TomMD]

I agree it is inconvenient. Is there any "cross compilation" flag in cabal's build info? If so we could "do the right thing" inside of Setup.hs.