On 05/03/2017 23:42, Dave Gittins wrote: > I have a question about the intended declarations of ::abs in gcc when > we #include <cstdlib>. On a related subject, Jonathan posted this article a few weeks ago: https://developers.redhat.com/blog/2016/02/29/why-cstdlib-is-more-complicated-than-you-might-think/ Regards.