Eliminating repetition in cabal files

I often have similar properties in many stanzas of my .cabal files. E.g.

Library x
    ...
    ghc-options:
       -O2 -Wall -fno-warn-missing-signatures -fwarn-incomplete-patterns
       -fno-warn-name-shadowing

Executable y
    ...
    ghc-options:
       -O2 -Wall -fno-warn-missing-signatures -fwarn-incomplete-patterns
       -fno-warn-name-shadowing

Keeping them consistent is tedious and error-prone. Is there a better way?

Even trickier is when the fields are similar but not exactly the same e.g. when I have several executables which have common build dependencies but small variations.