[gcc r13-6876] libstdc++: Fix up experimental/net/timer/waitable/dest.cc testcase

[Jakub Jelinek <jakub@gcc.gnu.org>]

https://gcc.gnu.org/g:3c0f5a9533bcb200d2d49755e653cf8f6c637118

commit r13-6876-g3c0f5a9533bcb200d2d49755e653cf8f6c637118
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Mon Mar 27 12:02:06 2023 +0200

    libstdc++: Fix up experimental/net/timer/waitable/dest.cc testcase
    
    In Fedora package build I've noticed a failure
    /builddir/build/BUILD/gcc-13.0.1-20230324/libstdc++-v3/testsuite/experimental/net/timer/waitable/dest.cc: In function 'void test01()':
    /builddir/build/BUILD/gcc-13.0.1-20230324/libstdc++-v3/testsuite/experimental/net/timer/waitable/dest.cc:41: warning: format '%lu' expects argument of type 'long unsigned int', but a
    rgument 2 has type 'unsigned int' [-Wformat=]
    FAIL: experimental/net/timer/waitable/dest.cc (test for excess errors)
    Excess errors:
    /builddir/build/BUILD/gcc-13.0.1-20230324/libstdc++-v3/testsuite/experimental/net/timer/waitable/dest.cc:41: warning: format '%lu' expects argument of type 'long unsigned int', but
    +argument 2 has type 'unsigned int' [-Wformat=]
    because we build with -Wformat.
    
    The test uses %lu for size_t argument, which can be anything from unsigned
    int to unsigned long long.  As for printf I'm not sure we can use %zu
    portably and given the n == 1 assertion, I think the options are to kill
    the printf, or cast to long.
    
    2023-03-27  Jakub Jelinek  <jakub@redhat.com>
    
            * testsuite/experimental/net/timer/waitable/dest.cc: Avoid -Wformat
            warning if size_t is not unsigned long.

Diff:
---
 libstdc++-v3/testsuite/experimental/net/timer/waitable/dest.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/testsuite/experimental/net/timer/waitable/dest.cc b/libstdc++-v3/testsuite/experimental/net/timer/waitable/dest.cc
index cff654c0527..cb818708aef 100644
--- a/libstdc++-v3/testsuite/experimental/net/timer/waitable/dest.cc
+++ b/libstdc++-v3/testsuite/experimental/net/timer/waitable/dest.cc
@@ -38,7 +38,7 @@ test01()
     timer.async_wait([&ec](std::error_code e) { ec = e; });
   }
   auto n = ctx.run();
-  __builtin_printf("ran %lu\n", n);
+  __builtin_printf("ran %lu\n", long(n));
   VERIFY( n == 1 );
   VERIFY( ec == std::errc::operation_canceled );
 }