[gcc r11-9300] libstdc++: Make test print which random_device tokens work

[Jonathan Wakely <redi@gcc.gnu.org>]

https://gcc.gnu.org/g:4063c2012312555af00ad8bf68ad6c74665a315e

commit r11-9300-g4063c2012312555af00ad8bf68ad6c74665a315e
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Nov 9 15:11:11 2021 +0000

    libstdc++: Make test print which random_device tokens work
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/26_numerics/random/random_device/cons/token.cc:
            Print results of random_device_available checks.
    
    (cherry picked from commit 95e8fcd3d50cbf5bf8a211afeafdf640ed86a015)

Diff:
---
 .../testsuite/26_numerics/random/random_device/cons/token.cc       | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/libstdc++-v3/testsuite/26_numerics/random/random_device/cons/token.cc b/libstdc++-v3/testsuite/26_numerics/random/random_device/cons/token.cc
index a351f57b236..fac5a9fb2c6 100644
--- a/libstdc++-v3/testsuite/26_numerics/random/random_device/cons/token.cc
+++ b/libstdc++-v3/testsuite/26_numerics/random/random_device/cons/token.cc
@@ -24,6 +24,7 @@
 
 #include <random>
 #include <stdexcept>
+#include <cstdio>
 #include <testsuite_hooks.h>
 #include <testsuite_random.h>
 
@@ -57,8 +58,14 @@ test03()
   int count = 0;
   for (const std::string& token : tokens)
   {
+    std::printf("checking std::random_device(\"%s\"):\t", token.c_str());
     if (__gnu_test::random_device_available(token))
+    {
+      std::puts("yes");
       ++count;
+    }
+    else
+      std::puts("no");
   }
   VERIFY( count != 0 );
 }