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Haskell: ghc-options
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ghc_options.md

Cabal: ghc-options

  • ghc-options specified in *.cabal apply to LOCAL packages.

  • If you want your ghc-options to be applied to ALL packages (including dependencies), you need to create a top-level cabal.project:

    packages: .

package *
  ghc-options: -O2

For this reason, it is important to tweak your ghc-options on a library. For example, check if -O1 or -O2 makes sense.

Source:

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