[PATCH] Fix libstdc++ tests for -Wvolatile warnings in C++2a mode

[Jonathan Wakely]

        * testsuite/20_util/result_of/sfinae_friendly_1.cc: Add -Wno-volatile
        for C++2a and up. Define HAS_52748_FIXED and fix incorrect tests.
        * testsuite/tr1/3_function_objects/result_of.cc: Add -Wno-volatile
        for C++2a and up.

Tested x86_64-linux, committed to trunk.


commit 25f120f074c602424f5a05bd629deabccd77f75e
Author: redi <redi@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Wed Sep 11 11:38:15 2019 +0000

    Fix libstdc++ tests for -Wvolatile warnings in C++2a mode
    
            * testsuite/20_util/result_of/sfinae_friendly_1.cc: Add 
-Wno-volatile
            for C++2a and up. Define HAS_52748_FIXED and fix incorrect tests.
            * testsuite/tr1/3_function_objects/result_of.cc: Add -Wno-volatile
            for C++2a and up.
    
    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@275643 
138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/libstdc++-v3/testsuite/20_util/result_of/sfinae_friendly_1.cc 
b/libstdc++-v3/testsuite/20_util/result_of/sfinae_friendly_1.cc
index ed3e011f937..86aa52029cc 100644
--- a/libstdc++-v3/testsuite/20_util/result_of/sfinae_friendly_1.cc
+++ b/libstdc++-v3/testsuite/20_util/result_of/sfinae_friendly_1.cc
@@ -1,4 +1,5 @@
 // { dg-do compile { target c++11 } }
+// { dg-additional-options "-Wno-volatile" { target c++2a } }
 
 // Copyright (C) 2012-2019 Free Software Foundation, Inc.
 //
@@ -21,9 +22,9 @@
 #include <cstddef>
 #include <type_traits>
 
-// TODO: Uncomment the following define once gcc has fixed bug 52748
+// Uncomment the following define once gcc has fixed bug 52748
 // (incomplete types in function call expressions):
-//#define HAS_52748_FIXED
+#define HAS_52748_FIXED
 
 // Helper types:
 struct has_type_impl
@@ -627,9 +628,9 @@ static_assert(is_type<std::result_of
 static_assert(is_type<std::result_of
              <variable_functor<Ukn>&(int, int, int)>, Ukn>(), "Error!");
 
-static_assert(is_type<std::result_of<PMSIncomplete(int)>, Ukn>(), "Error!");
-static_assert(is_type<std::result_of<PMSIncomplete&(int)>, Ukn>(), "Error!");
-static_assert(is_type<std::result_of<PMSIncomplete&&(int)>, Ukn>(), "Error!");
+static_assert(is_type<std::result_of<PMSIncomplete(S*, int)>, Ukn>(), 
"Error!");
+static_assert(is_type<std::result_of<PMSIncomplete&(const S&, int)>, Ukn>(), 
"Error!");
+static_assert(is_type<std::result_of<PMSIncomplete&&(S&&, int)>, Ukn>(), 
"Error!");
 
 static_assert(is_type<std::result_of<FuncIncomplete(int)>, Ukn>(), "Error!");
 static_assert(is_type<std::result_of<FuncIncomplete&(int)>, Ukn>(), "Error!");
diff --git a/libstdc++-v3/testsuite/tr1/3_function_objects/result_of.cc 
b/libstdc++-v3/testsuite/tr1/3_function_objects/result_of.cc
index 02cf8bf8c6d..dea0665b1e3 100644
--- a/libstdc++-v3/testsuite/tr1/3_function_objects/result_of.cc
+++ b/libstdc++-v3/testsuite/tr1/3_function_objects/result_of.cc
@@ -17,6 +17,8 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
+// { dg-additional-options "-Wno-volatile" { target c++2a } }
+
 // 3.4 function return types
 #include <tr1/functional>
 #include <tr1/type_traits>