Use SD-6 feature test macro to determine whether to enable P0012 ABI tests

test/catch_function_03.pass.cpp

 //===----------------------------------------------------------------------===//
 
 // Can a noexcept function pointer be caught by a non-noexcept catch clause?
-// UNSUPPORTED: c++98, c++03, c++11, c++14
-// UNSUPPORTED: libcxxabi-no-exceptions
+// UNSUPPORTED: libcxxabi-no-exceptions, libcxxabi-no-noexcept-function-type
 
 #include <cassert>
 
-#ifdef __cpp_noexcept_function_type
 template<bool Noexcept> void f() noexcept(Noexcept) {}
 template<bool Noexcept> using FnType = void() noexcept(Noexcept);
 

     check<true, true>();
     check_deep();
 }
-#else
-int main() {}
-#endif

test/catch_member_function_pointer_02.pass.cpp

 
 // Can a noexcept member function pointer be caught by a non-noexcept catch
 // clause?
-// UNSUPPORTED: c++98, c++03, c++11, c++14
-// UNSUPPORTED: libcxxabi-no-exceptions
+// UNSUPPORTED: libcxxabi-no-exceptions, libcxxabi-no-noexcept-function-type
 
 #include <cassert>
 
-#ifdef __cpp_noexcept_function_type
 struct X {
   template<bool Noexcept> void f() noexcept(Noexcept) {}
 };

     check<true, true>();
     check_deep();
 }
-#else
-int main() {}
-#endif

test/libcxxabi/test/config.py

         self.libcxxabi_obj_root = self.get_lit_conf('libcxxabi_obj_root')
         super(Configuration, self).configure_obj_root()
 
+    def has_cpp_feature(self, feature, required_value):
+        return self.cxx.dumpMacros().get(feature, 0) >= required_value
+
     def configure_features(self):
         super(Configuration, self).configure_features()
         if not self.get_lit_bool('enable_exceptions', True):
             self.config.available_features.add('libcxxabi-no-exceptions')
+        if not self.has_cpp_feature('noexcept_function_type', 201510):
+            self.config.available_features.add('libcxxabi-no-noexcept-function-type')
 
     def configure_compile_flags(self):
         self.cxx.compile_flags += ['-DLIBCXXABI_NO_TIMER']