Fix `--with-compiler` failing to locate compiler on Windows

pass --host=$HOST to configure when cross-compiling

Make v2-test succeed when no test suites found

Automatically pass -x to hsc2hs when cross-compiling

This changes the default behaviour to succeed when no test suites are found. The
old behaviour can be achieved by passing --test-fail-when-no-test-suites.

Sessions with new changes:

$ cabal v2-test
Resolving dependencies...
No tests to run for the package initsample-0.1.0.0

$ cabal v2-test --test-fail-when-no-test-suites
Resolving dependencies...
cabal: Cannot run tests for the target '' which refers to the package
initsample-0.1.0.0 because it does not contain any test suites.

Remove unix constraint from cabal.project (forward port)

Spec changes 3.0 [docs]

Fix checkRelocatable for deps when prefix is not subdir of pkgroot

Make all or none commas in optional comma lists

- Add bunch of installed constraints to cabal.project.local.travis
- Fix compat in D.Compat.Directory
- Compat (process-1.1/ghc-7.6) in cabal-testsuite
- validate.sh improvements
- Warningless cabal-testsuite build

[WIP] Port Travis fixes from the 2.4 branch

PoC: If import

This flag changes the exit behaviour of the v2-test command when the
TargetProblem is that no tests were found. By default, this will result in
'cabal v2-test' returning 1, with the flag enabled it now prints a
friendlier error message and returns 0.

Closes #4291

Oleg Grenrus authored 6 years ago and Mikhail Glushenkov committed 6 years ago

Remove unix constraint from cabal.project

(cherry picked from commit 6797a9e5)

- Warn about missplaced import (on top level)
- Warn in trees

Herbert Valerio Riedel authored 6 years ago and Mikhail Glushenkov committed 6 years ago

cabal-install-2.4 doesn't build anymore w/ GHC 7.8 and older;
so the metadata revision took care to fixup the lower bound of
base and other boot libs to take the versions bundled w/ GHC 7.10.1
as the lower bounds.

Moreover, this also fixes some upper bounds not being PVP compliant.

(cherry picked from commit 0ba16f5c)

Remove fields in cabal spec 3.0

- extensions
- (singular) hs-source-dir
- build-tools

Example, with `cabal-version: 2.5`

```
[laptop] tree-diff % cabal new-build --dry
Errors encountered when parsing cabal file ./tree-diff.cabal:

tree-diff.cabal:59:3: error:
The field "extensions" is removed in the Cabal specification version 2.5. Please use 'default-extensions' or 'other-extensions' fields.

   58 | library
   59 |   extensions: CPP
      |   ^

tree-diff.cabal:60:3: error:
The field "extensions" is removed in the Cabal specification version 2.5. Please use 'default-extensions' or 'other-extensions' fields.

   59 |   extensions: CPP
   60 |   extensions: DeriveGeneric
      |   ^
```

I needed to add new CabalSpecVersion to properly issue deprecation
messages of `extensions`.

Add Distribution.Pretty.Field

- and it's little cousin fromParsecFields,
- Also test that `showFields . fromParsecFields . readFields` roundtrips
  on Hackage Corpus

Something to do: Go from Parsec.Field to Pretty.Field directly,
that's may be useful for some tools

Fix Incorrect `tar.gz` Extension

Refactor options fields to use PerCompilerFlavor type

Remove support for `.zip` format source distributions

Add 'SimplePackage' package type for `cabal init`