On 12 April 2018 at 21:02, Murray Cumming wrote:
> I've just released a version of libsigc++-3.0 (currently unstable) that
> requires C++17. This means that gtkmm-4.0 (currently unstable) requires
> C++17 too. I should have mentioned it first, but I think this is fine.

What are you using from C++17?

GCC's C++17 implementation is not stable yet, so there are still ABI
changes possible between GCC 8 and GCC 9.

IIRC we've already introduced some (minor) incompatibilities between
the std::variant in GCC 7 and GCC 8.
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