I think the real root of the problem here is that it's very easy to forget adding `--freeze1` to the command line. Perhaps having a way to
#16242: Hadrian is too aggressive in rebuilding -------------------------------------+------------------------------------- Reporter: goldfire | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Build System | Version: 8.6.3 (Hadrian) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by snowleopard): persist this setting would alleviate much of the pain associated with unintended rebuilds. We could indeed make it possible to set `--freeze1`, or more generally `--skip` any set of dependencies, by modifying the default build flavour in `UserSettings.hs`. This requires the user to make some initial changes in their `UserSettings` file, but after that any `build` command will rebuild exactly what they asked. Does this sound like the right approach? I think implementation-wise, this is quite easy. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16242#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler