On 06/26/2014 11:15 AM, Ed Smith-Rowland wrote:
I, for one, would like gcc to bootstrap with c++11/c++14. I think we should be starting to shake down that path. I'm probably not alone in this.
Agreed.
On the other hand, I don't think c++-concepts branch should be the leader on this. We have our work cut out for us without fighting these bugs.
Also agreed.
Maybe a c++11-bootstrap branch could be started to work the c++1* bootstrap out.
I don't think a separate branch is necessary; people can bootstrap with -std=c++11 locally and fix issues they find on the trunk.
As for flags. I vote for concepts switched on for -std=c++1y. As for -fconcepts turning on c++1y I'm less sure. We could allow concepts for C++11 (I don't think c++98 would work because of constexpr and maybe new template syntax). I hadn't thought about that. Personally I leave -std=c++14 and use all the things... ;-)
-fconcepts should not be implied by -std=c++1[4y], because concepts are not part of C++14. We could add -std=c++1z and add it to that, though.
I lean weakly against having -fconcepts imply a particular -std level, but it should definitely require c++11 or higher.
Jason
