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* Support run GHC's test from hadrian.

1. Necessary command line arguments to run test driver.
   + `--test-only=<TEST_CASE>`
   + `--test-skip-perf`
   + `--test-summary=<SUMMARY_FILE>`
   + `--test-junit=<SUMMARY_FILE>`
   + `--test-config=<EXTRA_TEST_CONFIG>`
2. Synchronize configurations from test.mk.
3. Synchronize GHC's compilation flags from test.mk (that's very important).

* The `RunTest` builder and `test` rule to run GHC's test.
* Timeout rules.
* Reduce boilerplate.
* Fix warning.
* Move getTestArgs into Settings.Builders.RunTest.
* Drop `validate` related code to avoid confusion.
* Replace explicit `chmod +x` with `makeExecutable`.
* Fix executable's extension.

* Fix colours

* Simplify data types

* Fix doc typo

See #481

Delete the .git folder explicitly

Fix #488

* Drop -Werror from default arguments

See #483, #485.

This allows you to use configurePhase/buildPhase as usual and
set the right configureFlags rather than end up with a broken
executable.

* Add ways to build hadrian using nix

This adds two new files to the hadrian directory

    shell.nix sets up the build envrionment you need to build ghc
    build-nix is a simple wrapper which invokes hadrian in the correct environment

Note: this patch was authored by @mpickering, however it ended up on phabricator due to the subtree as https://phabricator.haskell.org/D4207.

* Comments and renamed build-nix

See #465, #466

See #464

* Drop non-source dependencies during compilation

* Drop duplicated dependencies on package configuration

* Compute transitive closure of context dependencies

* Don't depend on a temporary file

See https://phabricator.haskell.org/D4121#117481

Using a local `filepath` forces new-build to build the
non-local build-tool `alex` as in-place which however isn't supported properly
by `cabal new-build` yet (this will be fixed at the earliest in cabal 2.2) and thus
breaks `hadrian/build.sh` for me.

As pointed out in D4181, these headers refer to undefined macros.

See #457

* Do not run configure by default

* Enable automated configure on CI

* Update docs

See #395, #453

See #453

GHC's `master` branch now sits on a snapshot of Cabal 2.1.0.0

See https://github.com/snowleopard/hadrian/issues/449.

* Fix non-exhaustive pattern match warning

* Move warnings-related settings to a separate module

* Move defaultHsWarningsArgs to Settings.Warnings, add -Wcpp-undef

* Use defaultGhcWarningsArgs in Settings.Builders.Ghc. Add -Wnoncanonical-monad-instances.

* Add warnings for ghc-cabal

* Add RTS warning flags

* Fix build with integer-simple library

* There are no tabs in xhtml

See #440

See #347, #440

See #414

* Drop --haddock flag and always build Haddock and xthml

See #414

* Reorder imports

* Update README

See #414

See #440

[skip ci]

See #440

See #414

[skip ci]

See #428

[skip ci]

See #428

See #347

See #347

See #440

* Fix CI

* Another attempt

* Another tweak