[Bug libstdc++/92570] [8/9/10 Regression] clang fails to instantiate std::optional if A is not const copy constructible
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92570 Ville Voutilainen changed: What|Removed |Added Status|ASSIGNED|RESOLVED Resolution|--- |INVALID --- Comment #3 from Ville Voutilainen --- This is http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0641r2.html which clang implements only in c++2a mode, because those core issues were never explicitly marked DR. We could almost fix this on the library side by removing the =default from _Optional_payload_base, but _Optional_payload would still run into this problem. This is not worth library heroics.
[Bug libstdc++/92570] [8/9/10 Regression] clang fails to instantiate std::optional if A is not const copy constructible
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92570 Ville Voutilainen changed: What|Removed |Added Status|NEW |ASSIGNED CC||ville.voutilainen at gmail dot com Assignee|unassigned at gcc dot gnu.org |ville.voutilainen at gmail dot com
[Bug libstdc++/92570] [8/9/10 Regression] clang fails to instantiate std::optional if A is not const copy constructible
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92570 Jonathan Wakely changed: What|Removed |Added Known to work||7.5.0 Summary|clang fails to instantiate |[8/9/10 Regression] clang |std::optional if A is|fails to instantiate |not const copy |std::optional if A is |constructible |not const copy ||constructible Known to fail||10.0, 8.3.0, 9.2.0 --- Comment #2 from Jonathan Wakely --- Marking as a regression, since clang is happy with the libstdc++ headers from GCC 7. I haven't analysed where the bug is yet though.
