[Bug c++/60512] would be useful if gcc implemented __has_feature similary to clang

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60512

--- Comment #4 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Evan Teran from comment #3)
> Any unsupported feature would do.

All the core features are at least partially supported, only some ABI-breaking
library changes have been postponed.

> A quick read of that page shows a pretty good solution. Has any word towards
> implementing its recommendations been done?

I don't think so. Feel free to start. Defining a bunch of macros seems like a
nice and easy way to start contributing to gcc ;-)