stdlib.h abs(long) overload?

[Marc Glisse]

On Mon, 3 Mar 2014, Stephan Bergmann wrote:

> I discovered that at least with Fedora 20 combination of libstdc++ 4.8.2 and 
> glibc 2.18, including stdlib.h does not make available an abs(long) overload 
> to abs(int).

And more generally we don't add anything to the C headers.

> It works correctly when using cstdlib and std::abs instead, and my reading of 
> the C++ standards (both 03 and 11) is that including stdlib.h should make the 
> overload available in the global namespace.

Yes, there are several PRs in bugzilla about that.

> The __CORRECT_ISO_CPP_STDLIB_H_PROTO in the source (apparently only used for 
> Solaris) makes me assume that this is a known issue.  Is the take of 
> libstdc++ on this that it is a bug in glibc that needs to be fixed there?

Solaris has cool headers, but nothing prevents glibc from imitating them, 
it already has some C++ extras (__CORRECT_ISO_CPP_STRING_H_PROTO).

> (Not sure whether the alternative of working around the glibc shortcoming in 
> libstdc++, by providing a stdlib.h wrapper, say, would be feasible at all.)

Yes, it should be rather straightforward for most headers, and it is 
needed for all the platforms that provide C-only headers, it's just that 
nobody was motivated enough.

-- 
Marc Glisse