Looking at the doc/user-setting.md file for Hadrian, I would guess the following. https://github.com/ghc/ghc/blob/master/hadrian/doc/user-settings.md 1. Copy hadrian/src/UserSettings.hs to hadrian/UserSetting.hs 2. Define ``` dumpArgs = userArgs = builder Ghc ? package base ? arg "-ddump-simpl -ddump-to-file -ddump-dir=foo" ``` 3. Create a build flavour something like userFlavour = quickestFlavour { name = "user", args = (args quickestFlavour) <> dumpArgs } 4. Compile with `./hadrian.sh -j --flavour=user` On Wed, Dec 19, 2018 at 7:33 PM David Feuer wrote:

I don't happen to know the answer to your question, but when hacking on base, you can often get the job done much faster by copying the necessary source files somewhere else and renaming modules as necessary. Recompiling base is a pain and a half.

On Wed, Dec 19, 2018 at 2:26 PM Andrew Martin wrote:

...

How does one go about using -ddump-simpl -dsuppress-all -ddump-to-file (or variations of this) when building base? I've got some strong suspicions that that are arguments to event manager functions that are morally strict that go unnoticed by demand analysis. However, I need to dump base's core to confirm this.

-- -Andrew Thaddeus Martin _______________________________________________ Libraries mailing list Libraries@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/libraries

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Awesome, thanks! That's good to know. On Wed, Dec 19, 2018 at 3:08 PM Richard Eisenberg wrote:

On Dec 19, 2018, at 2:25 PM, Andrew Martin wrote:

How does one go about using -ddump-simpl -dsuppress-all -ddump-to-file (or variations of this) when building base?

Add a line like

GhcLibHcOpts += -ddump-simpl -dsuppress-all -ddump-to-file

at the end of your build.mk. You can see other similar options in the files in the flavours subdirectory of the mk directory.

I hope this helps! Richard

-- -Andrew Thaddeus Martin