[Haskell-cafe] How to define CPP macro definition with stack?
vanessa.mchale at iohk.io
Wed Jun 20 10:13:28 UTC 2018
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
> 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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