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)