Re: [Chicken-hackers] Including chicken.h fails for C++11

[Peter Bex]

On Wed, Jan 14, 2015 at 04:17:00PM +0300, Izaak wrote:
> Hi,
> 
> I realize that Chicken is a C library, but when using it in C++11, I get a 
> compilation error because of mismatched math function declarations, for 
> example:
>    /usr/local/include/chicken/chicken.h:1036:27: error: declaration of 
> ‘double trunc(double)’ has a different exception specifier
>  extern double trunc(double);
> 
> That was from gcc 4.9.1. I have attached full error output.

I had a look at this, and I'm puzzled by the following bit:

# ifdef __linux__
extern double round(double);
extern double trunc(double);
# endif

We already include math.h, which should include the definition already,
so I don't see the point in declaring it ourselves.  Felix: do you
remember why this was added?  The original version was slightly different:

# ifdef __GNUC__
/* this is stupid */
extern double round(double);
extern double trunc(double);
# endif

It was introduced in changeset fcc7e346c63e24be91337df9a3ad30d0c5360144
in December 2009.

Cheers,
Peter

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