[Development] Requesting forward BC exception for QtWaylandCompositor in 6.2 and 5.15

Marc Mutz marc.mutz at qt.io
Thu Feb 17 11:53:11 CET 2022

Hi Thiago,

> By the way, how often is this done? What's the exposure in the real world?

Does FTBFS of qtwayland count? 🙂 IOW: Clang and GCC found this one for me, I didn't look.

> The pre-6.3 implementation could be #if __cplusplus <= 20200000

Two comments:

  1.  possibly, with __cpp_impl_three_way_comparison instead (__cplusplus is unreliable), but
  2.  that brings up back to The Other Discussion™, about C++20 types in the ABI, which isn't really about C++20 types, after all, but about symbols only C++20 code would need/could use

I'm not sure where we left off on (2), but it's unlikely that anything we decide will be retroactively applied to Qt 6.2, isn't it?


Marc Mutz

Principal Software Engineer

The Qt Company
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marc.mutz at qt.io<mailto:marc.mutz at qt.io>


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