Tracking ticket for Galois new-build requirements #3577

I've been gathering assessments and feedback about the new-build features from my colleagues here at Galois. This ticket tracks the issues that we've found are particularly relevant for us, and that would need to be resolved before we can adopt new-build for most of our projects.

This is not meant to be exhaustive, or meant to imply that other issues are not important; this is just a scratchpad that'll evolve as I gather more feedback. Usernames in parentheses are the owners of this particular ticket from the Galois side, even when that's different from the assignee.

Must resolve

These are the features that currently prevent us from adopting new-build on one or more projects:

• Dependency executables aren't in PATH #3417: Dependency executables aren't in PATH
• [nix-local-build] Support --prefix, --datadir, etc #3586: Support --prefix, --datadir, etc
• How do I haddock with new-build? #3535: How do I haddock with new-build?
• [nix-local-build] new-run, new-test, new-bench, new-exec #3638: (@dmwit)
  • new-run
  • new-test
  • new-bench
  • new-exec
• Nix-style builds need to install data files for inplace builds #4120: data files for inplace builds

Nice to resolve

Not showstoppers, but necessary to make it worth switching from an existing system:

• Support non-Hackage dependencies #2189: Support non-Hackage dependencies
• [nix-local-build] new-install interface for installing executables #3332: new-install interface for installing executables (@dmwit)
  • nonlocal
  • local
• [nix-local-build] Garbage collecting the store #3333: Garbage collecting the store (@dmwit)
• Add flag to build all packages in project with new-build #3391: Add flag to build all packages in project with new-build
• new-build silent failure on zip-archive-0.3.0.2 #3394: new-build silent failure on zip-archive-0.3.0.2
• [nix-local-build] Replacement needed for cabal copy #3473: Replacement needed for cabal copy
• Add flag to new-configure for adding extra packages to cabal.project.local #3585: Add flag to new-configure for adding extra packages to cabal.project.local (@aisamanra)
• [nix-local-build] Allow specifying freeze file for other commands #3587: Allow specifying freeze file for other commands

Bonus

Not necessarily specific new-build, but would be of great utility for adopters if we'll already be working in the neighborhood:

• build Setup.hs with local compiler when cross-compiling #1493: build Setup.hs with local compiler when cross-compiling (@Ericson2314 laying the groundwork)