[PATCH] c++, libstdc++: Implement C++26 P2747R2 - constexpr placement new [PR115744]

[Jason Merrill]

On 7/3/24 10:37 AM, Jakub Jelinek wrote:
> +#if __cpp_lib_constexpr_new >= 202406L
> +# define _GLIBCXX_PLACEMENT_CONSTEXPR constexpr
> +#else
> +# define _GLIBCXX_PLACEMENT_CONSTEXPR inline
> +#endif

I'm a bit curious why you want constexpr *or* inline rather than leaving 
the inline keyword on the declaration and maybe adding constexpr.  The 
effect should be the same either way, so just wondering.

Jason