How to pass arguments to build tools like happy

[Pierre van de Laar]

Dear Stack users,

On webpage https://www.haskell.org/happy/doc/html/sec-tips.html it is stated

If you are using GHC, generate parsers using the -a -g -c options, and compile them using GHC with the -fglasgow-exts option.

I can specify the ghc options to stack using the ghc-options field in the .cabal file.

Cabal support options for arbitrary programs (https://www.haskell.org/cabal/users-guide/installing-packages.html#programs-used-for-building),

yet stack doesn't recognize happy-options:

Cabal file warning in C:\Example.cabal: Unknown fields: happy-options (line 27)

Fields allowed in this section:

    exposed-modules, reexported-modules, required-signatures,

    exposed-signatures, exposed, buildable, build-tools, build-depends,

    cpp-options, cc-options, ld-options, pkgconfig-depends, frameworks,

    c-sources, js-sources, default-language, other-languages,

    default-extensions, other-extensions, extensions, extra-libraries,

    extra-ghci-libraries, extra-lib-dirs, includes, install-includes,

    include-dirs, hs-source-dirs, other-modules, ghc-prof-options,

    ghcjs-prof-options, ghc-shared-options, ghcjs-shared-options,

    ghc-options, ghcjs-options, jhc-options, hugs-options,

    nhc98-options

 Yet, how can I specify the parameters for build tools, like happy, in stack?

Thanks in advance!

Pierre

[Michael Snoyman]

I've never passed in parameters to happy, so I may be unaware of this functionality being available. But to my knowledge, there's no such feature in Stack right now. (Someone please correct me if I'm wrong.) The best way forward would probably be to open up a feature request on Github:

https://github.com/commercialhaskell/stack/issues/new

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[Pierre van de Laar]

Done: https://github.com/commercialhaskell/stack/issues/2868

[Damian Nadales]

Just for the record, cabal passes these flags to happy:
    https://github.com/haskell/cabal/blob/e28abb9ca321b74c82931d23d1e1cc75574ce4b9/Cabal/Distribution/Simple/PreProcess.hs

However, being able to specify custom flags should be possible.

On Tuesday, January 3, 2017 at 9:07:10 AM UTC+1, Pierre van de Laar wrote:

Done: https://github.com/commercialhaskell/stack/issues/2868