[Haskell-cafe] How to define CPP macro definition with stack?

[Vanessa McHale]

You'll need to change the `cpp-options` field in your .cabal file. You
can do this conditionally by using a cabal flag.


On 06/20/2018 02:16 AM, PY wrote:
> Hello all,
>
> I'm using conditional compilation:
>
> #ifdef BLAH
>   blahBlah
>   #endif
>
> And I want to define BLAH, but not in *.hs file. For example, with
> `stack` option or as environment variable... How can I do it? For
> example, `stack -DBLAH=1 build` or something else.
> I tried
>
>   stack build --flag='*:BLAH'
>
> - no effect.
>
> Also I tried
>
>   stack build --flag=my-library:BLAH
>
> and get error that my-library package does not define flag BLAH. So,
> it's total secret for me how to make such thing (like we can do with
> gcc, make, etc)  :-)
>
> ===
>
> Best regards, Paul
>
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