Prevent dependency on private library

show-build-info (lib:Cabal part)

Hannes Siebenhandl authored 6 years ago and Mikhail Glushenkov committed 5 years ago

This commit builds upon the work of cfraz89 and completes
the lib:Cabal part of the show-build-info feature.

Co-authored-by: Chris Fraser <cfraz89@gmail.com>

Ben Gamari authored 9 years ago and Mikhail Glushenkov committed 5 years ago

This allows users to get a JSON representation of various information
about how Cabal would go about building a package. The output of this
command is intended for external tools and therefore the format should
remain stable.

Unpack in existing directory if empty

Update issue template

Co-Authored-By: Mikhail Glushenkov <mikhail.glushenkov@gmail.com>

The pseudo-`NonEmpty` was temporarily introduced in
b4a96aab

in favour of the real `class Semigroup` provided by the canonical
`semigroups` package for GHC < 8.0

This way we can properly provide `Semigroup` instances as well a
`NonEmpty` lists in Cabal's public API in a uniform way for older GHCs
before GHC 8.0/base-4.9

NB: This incurs a dependency on `semigroups` *only* for GHC versions
    prior to GHC 8.0; similar to the pre-existing conditional
    dependency on the `fail` package

* Add default for v2-install
* Add changelog entry

Make a new bug report template.

I noticed that we need to ask whether it's `v1-` or `v2-` build. Maybe a template will help remove single roundtrip.

Fix #6082: Use pseudo-NonEmpty

This is intended to be used by tools like cabal-install so they can add
multilibs-compatibility even to older ghcs

Rename generate(s) to be greppable

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Related to the previous two commits (preventing dependency on private
libraries and marking main libraries as public)

ghc-pkg<8.8 cannot read the visibility field, so all libraries were reported
as private, even the main (unnamed) one. This commit forces the
visibility of main libraries to be "public".

This commit can be reverted once we stop supporting GHC<8.8, at the
condition that we keep marking main libraries as public when registering
them.

Simple.SrcDist: Fix search for DistPref

Previously we would look at directly at the sDistDistPref flag. However,
this may not be set, resulting in #6068. We should rather be using
findDistPrefOrDefault to find the DistPref directory.

Pass `@...` as a literal argument if the response file does not exist and support recursive response files