[gcc r12-4188] libstdc++: Improve test for printing volatile pointers

[Jonathan Wakely]

https://gcc.gnu.org/g:313193edfc3986c40dedce3d0b41455d0bcdbe43

commit r12-4188-g313193edfc3986c40dedce3d0b41455d0bcdbe43
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Oct 5 14:45:11 2021 +0100

    libstdc++: Improve test for printing volatile pointers
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/27_io/basic_ostream/inserters_other/char/volatile_ptr.cc:
            Check result matches non-volatile pointer.

Diff:
---
 .../27_io/basic_ostream/inserters_other/char/volatile_ptr.cc | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/libstdc++-v3/testsuite/27_io/basic_ostream/inserters_other/char/volatile_ptr.cc b/libstdc++-v3/testsuite/27_io/basic_ostream/inserters_other/char/volatile_ptr.cc
index 1b1a9434a95..151e13d3bdd 100644
--- a/libstdc++-v3/testsuite/27_io/basic_ostream/inserters_other/char/volatile_ptr.cc
+++ b/libstdc++-v3/testsuite/27_io/basic_ostream/inserters_other/char/volatile_ptr.cc
@@ -1,11 +1,15 @@
 // { dg-options "-std=gnu++23 -fno-inline" }
-// { dg-do link { target c++23 } }
+// { dg-do run { target c++23 } }
 
-#include <iostream>
+#include <sstream>
+#include <testsuite_hooks.h>
 
 int main()
 {
   int i = 0;
-  volatile void* p = &i;
-  std::cout << p << std::endl;
+  volatile void* vp = &i;
+  std::ostringstream s1, s2;
+  s1 << &i;
+  s2 << vp;
+  VERIFY( s1.str() == s2.str() );
 }