Shared BuildInfo between targets

[rudymatela]

A nice feature to add would be to share properties between targets. A common thing to see (even in cabal's .cabal file):

library
  exposed-modules: Blah, Bleh
  ghc-options: -Wall -Wsomething
  default-language: Haskell 2010
  if flag(debug)
    cpp-options: -DDEBUG

Test-Suite test
  ...
  ghc-options: -Wall -Wsomething
  default-language: Haskell 2010
  if flag(debug)
    cpp-options: -DDEBUG

Executable blah
  ...
  ghc-options: -Wall -Wsomething
  default-language: Haskell 2010
  if flag(debug)
    cpp-options: -DDEBUG

It would be nice to be able to declare the 4 lines as a set of options and just reference them on the different targets. With the new .cabal looking more or less like:

Common-Properties commonflags
  ghc-options: -Wall -Wsomething
  default-language: Haskell 2010
  if flag(debug)
    cpp-options: -DDEBUG

library
  exposed-modules: Blah, Bleh
  include-properties: commonflags

Test-Suite test
  ...
  include-properties: commonflags

Executable blah
  ...
  include-properties: commonflags

[rudymatela]

By the way, I've seen a few posts on stackoverflow related to this issue:

• Eliminating repetition in cabal files
• How to reduce duplication in the build-depends fields of a .cabal file?

[ulysses4ever]

Should this be closed in the light of common stanzas? (#4751, bfb1967, possible dup of #2832)

[Mikolaj]

@rudymatela: would you like to comment? Alternatively, we can close this ticket and you are very welcome to open a new one once you have the time to investigate the new cabal feature that plausibly solves this issue.

[rudymatela]

@ulysses4ever @Mikolaj I did not test the common stanzas feature, but by reading the relevant tickets (#4751, #2832) they seem to resolve this issue.

Thanks for addressing this!

I will close now.

[Mikolaj]

Thank you!