Well, for sure you can in define that in .cabal file:
if !os(windows)
CC-Options: "-DWINDOWS"
or something. See:
http://www.haskell.org/cabal/users-guide/developing-packages.html#configurations
On Fri, Feb 15, 2013 at 3:05 PM, Andrew Cowie <
and...@operationaldynamics.com> wrote:
> I've got a piece of code that looks like this:
>
> baselineContextSSL :: IO SSLContext
> baselineContextSSL = do
> ctx <- SSL.context
> SSL.contextSetDefaultCiphers ctx
> #if defined __MACOSX__
> SSL.contextSetVerificationMode ctx SSL.VerifyNone
> #elif defined __WIN32__
> SSL.contextSetVerificationMode ctx SSL.VerifyNone
> #else
> SSL.contextSetCADirectory ctx "/etc/ssl/certs"
> SSL.contextSetVerificationMode ctx $
> SSL.VerifyPeer True True Nothing
> #endif
> return ctx
>
> all very nice (this being necessary because apparently the non-free
> operating systems don't store their certs in a reliably discoverable
> place; bummer).
>
> That, however, is not the problem. After all, this sort of thing is what
> #ifdefs are for. The problem is needing to get an appropriate symbol
> based on what OS you're using defined.
>
> I naively assumed there would be __LINUX__ and __MACOSX__ and __WIN32__
> defined by GHC because, well, that's just the sort of wishful thinking
> that powers the universe.
>
> So my question is: what's an appropriate Haskell mechanism for building
> code that is OS / arch / distro specific? It's not like I have autoconf
> running generating me a config.h I could #include, right?
>
> This feels simple and an appropriate use of CPP; even the symbol names
> look just about like what I would have expected; stackoverflow said so,
> must be true. Just need to get the right symbol defined at build time.
>
> Any suggestions?
>
> AfC
> Sydney
>
>
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>
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