Backport instructions

hadrian.settings

stage1.*.ghc.hs.opts += -finfo-table-map -fdistinct-constructor-tables          
stage1.ghc-bin.ghc.link.opts += -eventlog                                                  

instructions.md

These instructions will tell you how to build GHC 8.10.2 with support for the -hi, -finfo-table-map and -fdistinct-constructor-tables flags.

First checkout this GHC Branch: https://gitlab.haskell.org/mpickering/ghc/-/commits/ghc-con-info-backport. Then:

1. mkdir _build, Copy the hadrian.settings file into _build.
2. git submodule update --init
3. perl boot
4. ./configure
5. ./hadrian/build.cabal.sh -j4

Viewing the profile

If you wish to view the profile, use eventlog2html version 0.9.0 or newer.

where does the hadrian.settings file go? I've never used Hadrian to build ghc before and the docs do not seem to mention this file

Found it https://gitlab.haskell.org/mpickering/ghc/-/blob/ghc-con-info-backport/hadrian/doc/user-settings.md