libstdc++: add missing to_underlying to module std [PR106852]

std::to_underlying was missing from the std module introduced in
r15-5366-g7db55c0ba1baaf. This patch adds the missing export for this
utility.

libstdc++-v3/ChangeLog:

	PR libstdc++/106852
	* src/c++23/std.cc.in (to_underlying): Add.

Signed-off-by: Nicolas Werner <nicolas.werner@hotmail.de>

diff --git a/libstdc++-v3/src/c++23/std.cc.in b/libstdc++-v3/src/c++23/std.cc.in
index dcba343426c6a67497bc4af1b01d3ba5ac27f904..c0b7e1dc7271ff0c1c2e2fe1b65812dfa96af3c2 100644 (file)
--- a/libstdc++-v3/src/c++23/std.cc.in
+++ b/libstdc++-v3/src/c++23/std.cc.in
@@ -3173,6 +3173,9 @@ export namespace std
   using std::make_pair;
   using std::piecewise_construct;
   using std::piecewise_construct_t;
+#if __cpp_lib_to_underlying
+  using std::to_underlying;
+#endif
   using std::tuple_element;
   using std::tuple_size;
 #pragma GCC diagnostic push