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hadrian: Add bootstrap scripts for building without cabal-install

Matthew Pickering requested to merge wip/hadrian-bootstrap into master

These scripts are originally from the cabal-install repo with a few small tweaks.

This utility allows you to build hadrian without cabal-install, which can be useful for packagers. If you are a developer then build hadrian using cabal-install.

If you want to bootstrap with ghc-8.10.5 then run the ./bootstrap script with the plan-bootstrap-8.10.5.json file.

bootstrap.py -d plan-bootstrap-8.10.5.json -w /path/to-ghc

The result of the bootstrap script will be a hadrian binary in _build/bin/hadrian.

There is a script (using nix) which can be used to generate the bootstrap plans for the range of supported GHC versions using nix.

generate_bootstrap_plans

Otherwise you can run the commands in ./generate_bootstrap_plans directly.

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