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

Added checks to see if files and directories exist

Auto-generate ChangeLog.md in cabal init

Treat -O2 in ghc-options as a cabal check "warning"

Cabal : Fix incomplete pattern matches.

cabal-install.cabal : Add missing test dependency.

Closes: https://github.com/haskell/cabal/issues/2447

Client.Init: add ChangeLog.md to extra-source-files if necessary. If there's already a ChangeLog-like file, it won't generate ChangeLog.md.

Use defaultRenaming for pkgs without renaming info

add GNU Hurd OS

Build Cabal/cabal-install with '-Werror' on Travis.

Haddock: Use --package-{name|version} when available

This is for fields "extra-source-files", "data-files", "extra-doc-files", "c-sources" and "js-sources"
See https://github.com/haskell/cabal/issues/1531

fixes haskell/hackage-server#269

Also fix some warnings to make it work.

Fixes #2375. The 'build' command now takes extra arguments, so
autoconfUserHooks should not fail if they are provided.

add Android OS

Export componentCcGhcOptions

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

Only print warning when starting repl

Open repl even if there are no exposed modules

fixes #1986

Add and fix the documentation.

Skip unbuildable tests and benchmarks