A terrible hack which solves #3545.

[ezyang]

See the comment in the code. I don't like it but it's BC!

Signed-off-by: Edward Z. Yang ezyang@cs.stanford.edu

[mention-bot]

@ezyang, thanks for your PR! By analyzing the annotation information on this pull request, we identified @ian-ross, @dcoutts and @SyntaxPolice to be potential reviewers

[ezyang]

@23Skidoo @phadej What do you think?

[phadej]

I don't think that re-arranging dist is breaking change as it's not clearly specified either. IIRC @dcoutts have commented about that somewhere.

Also e.g. https://github.com/ekmett/bound/blob/master/Setup.lhs doesn't rely on where stuff goes, as it asks Cabal where it puts stuff.

Also #3022 broke stuff already (for cabal_macros.h)

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But if it helps for now, then LGTM

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I'd propose to separate dist/build clearly per component, as we ultimately want to treat them fully independently apart that they come in single source package.

[23Skidoo]

I'd prefer the solution originally proposed in #3545, i.e. rearranging the directories. Using dist/build for library files always felt wrong to me.

[ezyang]

This change is vetoed!