Package keys vary in inplace.conf when --enable-tests is passed

[mgsloan]

When you build tests with Cabal, the library they link to has a different package key than the library which is installed. I believe what's happening is that the full set of dependencies, including test dependencies, are being used to compute the key.

Here's a repro:

darcs clone http://hub.darcs.net/byorgey/split
cd split/
cabal sandbox init
cabal install

ghc-pkg field split key yields key: split_E4yadeCDng9EtdbI5MZoDg

grep key dist/dist-sandbox-ac80d1aa/package.conf.inplace/split-0.2.2-inplace.conf yields key: split_E4yadeCDng9EtdbI5MZoDg

So far things are fine. However, if I do a cabal install --enable-tests:

ghc-pkg field split key yields key: split_E4yadeCDng9EtdbI5MZoDg (same as before)

grep key dist/dist-sandbox-ac80d1aa/package.conf.inplace/split-0.2.2-inplace.conf yields key: split_IeGRGsZxCma0P7epq3xazi (different!!!)

This makes it extremely difficult to correctly merge HPC tix files from test-suites in different packages. See also https://ghc.haskell.org/trac/ghc/ticket/10952

[mgsloan]

pinging @ezyang

[ezyang]

I think this is fixed in HEAD. Can you give a try?

[mgsloan]

Ah, yup, this is fixed in HEAD. Thanks!