Version test whether or not to use single-file package database, helps #2320 some more

[ezyang]

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

[23Skidoo]

LGTM.

[thoughtpolice]

What released version of Cabal will we need to ship with GHC 7.10 for this fix? (re: Trac #10036).

[23Skidoo]

/cc @tibbe

[tibbe]

Let me try to merge all the commits we need into the 1.22 branch by EOW and make a release. Here are the things I have in my 1.22 merge queue right now:

• Faster cabal builds by caching the build directory (Faster cabal builds by caching the build directory #2365)
• Skip unbuildable tests and benchmarks (Skip unbuildable tests and benchmarks #2376)
• Skip unbuildable tests and benchmarks (Skip unbuildable tests and benchmarks #2377)
• Disabled test suites cause spurious test failures (Disabled test suites cause spurious test failures #2357)
• Missing strip program (Missing strip program #2241)
• ghc-pkg: cannot create: dist/package.conf.inplace already exists (ghc-pkg: cannot create: dist/package.conf.inplace already exists #2320)
• Version test whether or not to use single-file package database, helps ghc-pkg: cannot create: dist/package.conf.inplace already exists #2320 some more (Version test whether or not to use single-file package database, helps #2320 some more #2391)
• cabal-install Missing field in record construction configProf (cabal-install Missing field in record construction configProf #2389)

/cc @ttuegel

[23Skidoo]

#2365 is not in HEAD, so I don't think it is ready to go into 1.22 either.

[ttuegel]

@tibbe The fix for #2389 is in the 1.22 branch now, and I don't have anything else unmerged.