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

Revert "Try top-level -Werror."

From Travis:

    Warning: /Users/travis/build/haskell/cabal/cabal.project.local: Unrecognized
    field 'ghc-options' on line 6

This reverts commit 6b7ff819.

Pass on -v0 to GHC.

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

[ci skip]

Report build failures with reasonably formatted messages

stack.yaml: add optional Nix dependency zlib

The external zlib package is required to build the zlib Haskell
library. This change will not affect Stack-using developers who do not
have Nix integration enabled globally. This change will not affect
non-Stack-using developers at all.

Don't pass -package-db and -package flags to --abi-hash.

Try top-level -Werror.

This should fix issue #3394

Previous patches had made the changes to collect the detailed error info
all in one place. So this patch is just about deciding what to report
and how to report it.

Still TODO is mentioning log files, ie when the package build was being
logged to a file, we should include a snippet and say where the log file
can be found for full details.

lookup, direct deps and rev deps, rev dep closure.

Fix Haddock syntax in cabal-install.

If we were generating Haddock for cabal-install (we're not
currently) these would cause errors.  Make them stop causing
errors.

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

Few very small refactors

Ensure appropriate permissions for manpage

Fixes #3653

Now allocates properly sized result buffer.

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

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

Remove TODO mentioning top down solver

[ci skip]

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

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

Revert "Generalize HookedBuildInfo to work with any type of component."

fix exception handling of downloads in new-build

Don't test sdist in the main script.

See https://github.com/haskell/cabal/pull/3630#issuecomment-235438329.