CPP Help (was Re: Latest Template Haskell Breaks Package)

Dominic Steinitz dominic at steinitz.org
Tue Dec 23 16:10:11 UTC 2014

How very clever of you and thank you very much. Changing ‘ to 1 does fix the problem.

I would have thought this would work

> cabal install --with-gcc=gcc-4.9

But sadly I still got the same error.

Do I need a special version of cpphs?

Dominic Steinitz
dominic at steinitz.org

On 23 Dec 2014, at 15:58, Brandon Allbery <allbery.b at gmail.com> wrote:

> On Tue, Dec 23, 2014 at 10:46 AM, Dominic Steinitz <dominic at steinitz.org> wrote:
> To restate the problem: this is from code that has not been changed for 2 years. I get
> > Examples.hs:42:42: Parse error in pattern: con
> > Failed, modules loaded: none.
> I think I see the problem. Are you by any chance on a machine which has clang as its default C compiler (OS X, FreeBSD 9.3?/10.x/STABLE/CURRENT, possibly others)? cpp will in that case malfunction because it won't substitute macro parameters after the single quote:
> >     minM' (con a#) (con b#) =                                        \
> -- 
> brandon s allbery kf8nh                               sine nomine associates
> allbery.b at gmail.com                                  ballbery at sinenomine.net
> unix, openafs, kerberos, infrastructure, xmonad        http://sinenomine.net

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