libstdc++: Add feature test macro for <experimental/scope>

libstdc++-v3/ChangeLog:

	* include/experimental/scope (__cpp_lib_experimental_scope):
	Define.
	* testsuite/experimental/scopeguard/uniqueres.cc: Check macro.

diff --git a/libstdc++-v3/include/experimental/scope b/libstdc++-v3/include/experimental/scope
index 37a57b38af73f702be2cf9de79257e482541e02e..208fadc513e4e381024ff664e2d0be675071ae08 100644 (file)
--- a/libstdc++-v3/include/experimental/scope
+++ b/libstdc++-v3/include/experimental/scope
@@ -43,6 +43,8 @@ namespace std _GLIBCXX_VISIBILITY(default)
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
 namespace experimental::inline fundamentals_v3
 {
+#define __cpp_lib_experimental_scope 201902
+
   template<typename _Tp, typename _Up>
     concept __not_same_as = !same_as<_Tp, _Up>;
 

diff --git a/libstdc++-v3/testsuite/experimental/scopeguard/uniqueres.cc b/libstdc++-v3/testsuite/experimental/scopeguard/uniqueres.cc
index 7690572ab190f45ecf489c72f74b6a8310712ebd..fe9d6ee7cfc6062e0da03a4971d744a277421ced 100644 (file)
--- a/libstdc++-v3/testsuite/experimental/scopeguard/uniqueres.cc
+++ b/libstdc++-v3/testsuite/experimental/scopeguard/uniqueres.cc
@@ -4,6 +4,12 @@
 #include <experimental/scope>
 #include <testsuite_hooks.h>
 
+#ifndef __cpp_lib_experimental_scope
+# error Feature-test macro is not defined.
+#elif __cpp_lib_experimental_scope < 201902
+# error Feature-test macro has bad value.
+#endif
+
 using std::experimental::unique_resource;
 
 void