libstdc++: Define __cpp_lib_define_static [PR123921]

I've totally missed the P3491R3 paper (define_static_{string,object,array})
comes with its own feature test macro - __cpp_lib_define_static 202506
which should appear in <version> and <meta>.
The paper contains 3 parts, std::is_string_literal,
std::meta::reflect_constant_{string,array} and
std::define_static_{string,object,array}.
The first part is implementable without reflection, the third part in theory
would be also implementable without reflection but usually will be (and in
libstdc++ is) implemented using reflection, and the middle part is really
part of reflection.  So dunno how useful this FTM actually is, maybe just
for cases where some implementation does implement reflection and doesn't
implement this paper for a while.

Anyway, the FTM is in C++26 draft, so this patch adds it, with the same
condition as __cpp_lib_reflection.

2026-02-03  Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/123921
	* include/bits/version.def (define_static): New with the
	same values as reflection.
	* include/bits/version.h: Regenerate.
	* include/std/meta: Define also __glibcxx_want_define_static before
	including bits/version.h.

	* g++.dg/reflect/feat2.C: Add also test for __cpp_lib_define_static.
	* g++.dg/reflect/feat3.C: New test.

0 files changed, 0 insertions, 0 deletions