stack ghci doesn't accept ghc-options

[bergmark]

Woops, accidental submit typing

[bergmark]

This seems to be a change in 0.1.4.0 (I Just upgraded to the bindist, Version 0.1.4.0, Git revision dac8cfe51802e08edb523b80c51cf35e21933513 (1722 commits) X86_64)

Previously my workflow was stack build --pedantic and then stack ghci a-package if a-package failed to compile. in 0.1.4.0 this happens:

$ stack ghci package
tostring-0.2.1.1-0dadd4186e26cc4bb0de459985e35fa9: unregistering (flags changed from ["--ghc-options","-Wall","--ghc-options","-Werror"] to [])

stack ghci --pedantic isn't supported, but adding the --ghc-options manually doesn't work either, stack still prints the new flags as []

Does this have something to do with stack build --pedantic foo resetting flags for other packages? Has this problem propagated to stack ghci? Running stack ghci and loading all packages is not an option for me unfortunately, a lot of modules makes it very slow.

Am I correct thinking this is what's going on? Is this expected behavior now? Any workarounds?

[chrisdone]

Right, stack ghci doesn't pass its arguments through to the build process, they're only passed to ghc --interactive. This would probably lead to unwelcome recompiling too if you provide stuff for ghc --interactive that has no relation to building of dependencies. And stack build doesn't save any state about the options you provide for ghc-options so you have to pass --pedantic every time and so should do so when calling stack ghci too.

Perhaps we need to distinguish between build flags and ghc --interactive flags. Maybe e.g.

• --ghc-options => passed to ghc --interactive
• --build-ghc-options => passed into the build process
• --pedantic => a shortcut for: --ghc-options "-Wall -Werror" --build-ghc-options "-Wall -Werror"

Then your regular use-case will work:

$ stack build --pedantic
$ stack ghci --pedantic

But also you can specify custom things in the rarer case like:

$ stack build --ghc-options -fno-warn-orphans
$ stack ghci --build-ghc-options -fno-warn-orphans --ghc-options -fobject-code

[mgsloan]

Looks like this got covered by the build-ghc-options flag, and furthermore will be addressed by #1186