recent changes to hsc2hs break wrapping c++

Simon Marlow marlowsd at
Thu Feb 16 13:27:54 CET 2012

On 15/02/2012 19:51, Evan Laforge wrote:
> On Wed, Feb 15, 2012 at 11:17 AM, Eugene Crosser<crosser at>  wrote:
>> On 02/15/2012 09:59 PM, Evan Laforge wrote:
>>> Unfortunately, the result is I (apparently) can't use it now.  Here's
>>> how that happens:  The change was to remove the dependency on HsFFI.h.
>> Evan, *if* including HsFFI.h is the only thing you need, you might try to add
>> "-i HsFFI.h" to your hsc2hs rule.
> Well, the main thing is that the C++ compiler chokes on the C stub
> file created.  So as long as it creates and tries to compile that with
> the compiler given in '-c' then it'll crash.  I guess another solution
> would be a separate '-c' flag for the compiler used for the stub :)
>> The problem still stands because we cannot expect every module author to do the
>> same.
> I think it's not too big a burden since for ghc it's just -I$(ghc
> --print-libdir)/include, and Duncan makes a good case for requiring
> it.

I'm not sure why you're using the C++ compiler from hsc2hs, and I don't 
think that is guaranteed to work.  But maybe we can fix it if there's a 
legitimate reason to want it.


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