`stack build package' resets flags of other local packages

[bergmark]

I commonly have this workflow

1. git pull
2. stack build --ghc-options=-Werror
3. make changes
4. stack build --ghc-options=-Werror changed-package
5. Repeat 3 and 4 until happy.

Currently 4 rebuilds local dependencies of changed-package without any flags.

I see two other options which would be preferable to me:

• Use -Werror for everything that needs to be built
• Don't care what flags the other packages were built with

Is there a good reason for the current behavior?

[snoyberg]

This sounds like: https://github.com/commercialhaskell/stack/wiki/FAQ#stack-sometimes-rebuilds-based-on-flag-changes-when-i-wouldnt-expect-it-to-how-come

[bergmark]

It is, thank you.

My problem currently is that I do 4. by accident not realizing I'll have to rebuild everything (which takes quite some time for us), in my mind stack build points to all packages and their (local) dependencies and stack build foo should point to foo and all its (local) dependencies.

But since this has been discussed already perhaps there's little point re-iterating the discussing, closing.