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This removes all dependencies the users guide had on `mkUserGuidePart`. The generation of the flag reference table and the various pieces of the man page is now entirely contained within the Spinx extension `flags.py`. You can see the man page generation on the orphan page https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/ghc.html The extension works by collecting all of the meta-data attached to the `ghc-flag` directives and then formatting and displaying it at `flag-print` directives. There is a single printing directive that can be customized with two options, what format to display (table, list, or block of flags) and an optional category to limit the output to (verbosity, warnings, codegen, etc.). New display formats can be added by creating a function `generate_flag_xxx` (where `xxx` is a description of the format) which takes a list of flags and a category and returns a new `xxx`. Then just add a reference in the dispatch table `handlers`. That display can now be run by passing `:type: xxx` to the `flag-print` directive. `flags.py` contains two maps of settings that can be adjusted. The first is a canonical list of flag categories, and the second sets default categories for files. The only functionality that Sphinx could not replace was the `what_glasgow_exts_does.gen.rst` file. `mkUserGuidePart` actually just reads the list of flags from `compiler/main/DynFlags.hs` which Sphinx cannot do. As the flag is deprecated, I added the list as a static file which can be updated manually. Additionally, this patch updates every single documented flag with the data from `mkUserGuidePart` to generate the reference table. Fixes #11654 and, incidentally, #12155. Reviewers: austin, bgamari Subscribers: rwbarton, thomie GHC Trac Issues: #11654, #12155 Differential Revision: https://phabricator.haskell.org/D3839
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