Drop the dead build-tool greencard

[andreasabel]

The greencard tool does not build with GHC 7.10 and up, so can be considered dead by now.

Cabal will now pretend it never knew about greencard.
I am not sure of the repercussions of this, e.g. when we want to revise a package on hackage that uses build-tools: greencard, will the parser or checker blow up on us?

[geekosaur]

Do we care? 7.10 doesn't even run on modern Linux, I think.

[andreasabel]

My old 2015 Mac can do 7.10 but my new Mac comfortably only supports 9.2 and up.

My only worries are about the revision process on hackage-server which uses Cabal the library.

[geekosaur]

I can see that, but my point was more that such revisions seem extremely unlikely to come up.

[andreasabel]

I have added a changelog entry now. So this PR is ready!

[andreasabel]

Another thing: old config files that have entries for greencard-options etc., do they fail to parse now or are these unrecognized fields ignored with a warning?
(Maybe this is also a hypothetical case...)

[ulysses4ever]

🚨 Spring cleaning! 🚨

[Mikolaj]

I guess, the effort needed to make this particular breakage less abrupt would be better spent elsewhere, so this seems fine.

[jasagredo]

Did we actually check that Hackage won't fail to parse? And configurations?

[jasagredo]

We also might consider this opportunity to remove haskell-suite, haskell-suite-pkg and hmake.

[jasagredo]

I just "request changes" to make sure this doesn't merge without an answer to the questions above.

[ulysses4ever]

We also might consider this opportunity to remove haskell-suite, haskell-suite-pkg and hmake.

#10912 covers first and third @jasagredo

[andreasabel]

unrecognized fields ignored with a warning?

Yes, you get a warning like Unrecognized field greencard-location on line NNN.

when we want to revise a package on hackage that uses build-tools: greencard, will the parser or checker blow up on us?

I think "no" because any executable is allowed under build-tools:, in particular, greencard will not lead to a parse error.

We also might consider this opportunity to remove haskell-suite, haskell-suite-pkg and hmake.

#10912 covers first and third @jasagredo

Actually all three.

• Remove knowledge about haskell-suite and hmake #10912

[jasagredo]

Thanks for the clarification