c++: module dialect tweak

Coroutines have been enabled by -std=c++20 since GCC 11.

gcc/cp/ChangeLog:

	* module.cc (module_state_config::get_dialect): Expect coroutines in
	C++20.

diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc
index 4eefb2d35840453ae4dcd90e7cee17f647cc90da..fe9cdd9bc242790e22645b73c2d73eb06288e26a 100644 (file)
--- a/gcc/cp/module.cc
+++ b/gcc/cp/module.cc
@@ -15166,9 +15166,10 @@ module_state_config::get_dialect ()
                      flag_exceptions ? "" : "/no-exceptions",
                      flag_rtti ? "" : "/no-rtti",
                      flag_new_inheriting_ctors ? "" : "/old-inheriting-ctors",
-                     /* C++ 20 implies concepts.  */
+                     /* C++ 20 implies concepts and coroutines.  */
                      cxx_dialect < cxx20 && flag_concepts ? "/concepts" : "",
-                     flag_coroutines ? "/coroutines" : "",
+                     (cxx_dialect < cxx20 && flag_coroutines
+                      ? "/coroutines" : ""),
                      flag_module_implicit_inline ? "/implicit-inline" : "",
                      flag_contracts ? "/contracts" : "",
                      NULL);