I just received the solution I was looking for from 23Skidoo:

You can solve this by adding a line

constraints: some-package +some-flag

to cabal.config (in sandboxed project).



Thank you all for your time.

vlatko

-------- Original Message --------
Subject: Re: [Haskell-cafe] Specifying cabal sandbox flag for local package
From: Rogan Creswick <creswick@gmail.com>
To: vlatko.basic@gmail.com
Cc: haskell-cafe <haskell-cafe@haskell.org>
Date: 03.07.2014 22:09
On Thu, Jul 3, 2014 at 9:47 AM, Vlatko Basic <vlatko.basic@gmail.com> wrote:
Hello Cafe,

I have a local forked package and added its path to sandboxed project with
 'cabal sandbox add-source PATH'.

However, to build that package I have to specify a flag to 'cabal install'.
In other words I can't install it by
  'cabal install --only-dependencies',
but separately with
  'cabal install PACKAGE -fFLAG'.

I believe you can use constraints to resolve this.

eg:

$ cabal install --only-dep --constraint="snap-server +openssl"

to install snap-server (a dependency) with the openssl flag set.

(Credit to Adam Foltzer for pointing this out to me yesterday, coincidentally.)

--Rogan

 

Is there a way to tell cabal sandbox (or in project.cabal) to always use some flag(s) for compiling a (particular) package in local path?


GHC 7.8.2, Cabal 1.20.0


Best regards,

vlatko
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