I see most replies here ar mentioning the the build integration is what is mainly missing in the public tools. I wonder if nix and nixpkgs could be used here? Nix is a language agnostic build-system and with nixpkgs it has a build instructions for a massive amount of packages. Artifacts for all packages are also available via hydra.
Nix should also have enough context so that for any project it can get the source code of all dependencies and (optionally) all build-time dependencies.
Nix should also have enough context so that for any project it can get the source code of all dependencies and (optionally) all build-time dependencies.