P1383R2 More `constexpr` For `<cmath>` And `<complex>`

[StephanTLavavej]

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WG21-P1383R2 More constexpr For <cmath> And <complex>

INCREASED feature-test macros (applied by cplusplus/draft#6343 and cplusplus/draft#6421, present in WG21-N4971):

#define __cpp_lib_constexpr_cmath   202306L
#define __cpp_lib_constexpr_complex 202306L

:magic_wand: Requires compiler work, followup to:

• #2530

Note: We're focused on implementing the remaining library-only features in C++23. Until that's done, we will NOT be accepting PRs for C++26 features.

[frederick-vs-ja]

Perhaps this also requires front end to change (see discussion in #2530).

[StephanTLavavej]

Yes, I agree. Labeled, thanks.