GHC 7.10 HPC test failures

[23Skidoo]

Quite a lot of tests are failing on Travis with GHC HEAD right now with an error message that looks like:

PackageTests/TestSuiteExeV10/dist-WithHpc-LibProfExeProfExeDynShared/hpc/prof/mix/my-0.1/my-0.1/Foo.mix should exist

@ttuegel, can you please take a look?

[ttuegel]

Looks like GHC stopped respecting the -hpcdir option. I will double-check locally once I get GHC HEAD installed and file a bug with GHC if needed. This only affects HEAD and not the 7.10 branch, right? With the upcoming release, would it be possible to get a 7.10 branch test?

[23Skidoo]

Updated travis.yml to also run tests with GHC 7.10.1 snapshot.

[23Skidoo]

Looks like we'll have to wait until someone uploads a patched version of ansi-wl-pprint (see batterseapower/ansi-wl-pprint#11).

[ddssff]

You can add something like this to the travis install: section:

- travis_retry git clone https://github.com/hvr/ansi-wl-pprint --branch pr-base48
- cabal install ./ansi-wl-pprint

[23Skidoo]

@ddssff Thanks, that worked.

[23Skidoo]

@ttuegel Looks like this also happens with 7.10.

[ddssff]

@23Skidoo it looks like version 0.6.7.1 of ansi-wl-pprint from hackage is replacing hvr's patched version from github, which is still at 0.6.7. I created a fork in https://github.com/seereason/ansi-wl-pprint with the newer version number and made a pull request.

Hackage is becoming kind of a mess...

[ttuegel]

I cannot work on this currently because Cabal won't build with GHC HEAD. Looks like something to do with the last-minute changes to AMP.

[23Skidoo]

@ttuegel Which error are you getting?

[ttuegel]

[41 of 79] Compiling Distribution.Simple.Program.Db ( Distribution/Simple/Program/Db.hs, dist/setup/Distribution/Simple/Program/Db.o )

Distribution/Simple/Program/Db.hs:470:28:
    Not in scope: ‘<$>’
    Perhaps you meant ‘<*>’ (imported from Prelude)

[23Skidoo]

@ttuegel You are using an old snapshot of GHC HEAD that doesn't have <$> in the Prelude.

[ttuegel]

Right, thanks. I don't know why I thought NixOS's ghc-HEAD build would be up to date.

[ttuegel]

Looks like GHC >= 7.10 puts the module interfaces in $hpcdir/mix/$name-$version/$key now. I need to adjust the test according to GHC version.