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Herbert Valerio Riedel authored
Since we switched to a Git submodule based GHC Git repo, `ghc.git`'s commit id uniquely identifies the state of the GHC source-tree. So having that information embedded into the `ghc` executable provides valuable information to track accurately (especially when created by buildbots) from which source-tree-state a given `ghc` snapshot (distribution) was generated. So this commit adds a new field `"Project Git commit id"` to the `ghc --info` meta-data containing the `./configure`-time Git commit id as reported by `git rev-parse HEAD`. This field can also be queried with `ghc --print-project-git-commit-id`. For source distributions, the file `GIT_COMMIT_ID` is created (with some sanity checking to detect stale commit ids, as that would render this information rather useless) Reviewed By: austin Differential Revision: https://phabricator.haskell.org/D528
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