[Pkg-haskell-maintainers] Bug#680329: Bug#680329: Interpreted an int64_t typedef as CInt

[Josh Triplett]

retitle 680329 Does not parse GCC "mode" attribute for integer sizes (used in sys/types.h)
thanks

On Thu, Jul 05, 2012 at 01:03:33PM +1000, Erik de Castro Lopo wrote:
> Josh Triplett wrote:
> 
> > Package: c2hs
> > Version: 0.16.3-2
> > Severity: important
> > 
> > A library I'd like to write bindings to has a typedef of int64_t to a
> > library-specific type name. c2hs seems to interpret that type as CInt,
> > both in foreign import declarations and in {# type #} directives. It
> > should interpret that type as a 64-bit integer type instead.
> 
> I've seen this happen before and the cause was that the header file
> defining the int64_t to something else did not include <stdint.h>.
> 
> I think the solution was to tell c2hs somehow that <stdint.h> should be
> included before the project specific header.

The project does actually include <stdint.h>, but before it does so, it
(indirectly) includes <sys/types.h>, which defines int64_t in a
different way that c2hs can't cope with:

$ cpp /usr/include/stdint.h | grep -w int64_t
typedef long int int64_t;
$ cpp /usr/include/sys/types.h | grep -w int64_t
typedef int int64_t __attribute__ ((__mode__ (__DI__)));

I'd guess that c2hs ignores the GCC-specific __attribute__ that
overrides the size, and just sees "int".

Including <stdint.h> at the top of my .chs file works around the
problem, and causes c2hs to define the type as CLong.

- Josh Triplett