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Fix getExecutablePath on *BSD.

Fixes #3512.

[ci skip]

[ci skip]

Simon Jakobi authored Jul 02, 2016 and Mikhail Glushenkov committed Jul 06, 2016

(cherry picked from commit 0562d952)

Fix bug in dependency solver stanza preferences

Freeze solver goal order in two more unit tests

Count conflicts to speed up solver

(It already was the default for install.)

cabal-install: make user config optional if possible

Fixes #3494.

Add a goal order parameter to the dependency solver

Update stack.yaml

Fix issue 3460: avoid concurrent package db creation

Instead initialise all the ones we'll need in advance of building any
packages. The alternative would have been to use a lock, but there's no
particular advantage in trying to delay initialisation and avoiding
locks keeps things simpler.

This should fix #3460

Another similar issue was fixed by 1acc00f8 which serialised the
registration of packages in the local inplace package db, avoiding
lost updates (which could previously be observed in test case T3460).

Edward Z. Yang authored Jun 06, 2016 and Duncan Coutts committed Jun 26, 2016

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

New freeze command

This is ok, but not perfect since freezing is now more tricky with setup
deps. See https://github.com/haskell/cabal/issues/3502

Code to write it and to pick it up by default when reading the
cabal.project file.