[gcc r13-1499] libstdc++: testsuite: cast getpid result

[gcc r13-1499] libstdc++: testsuite: cast getpid result

[Alexandre Oliva]

https://gcc.gnu.org/g:b44cba355e1e27521b436cf56ea726d419939b5b

commit r13-1499-gb44cba355e1e27521b436cf56ea726d419939b5b
Author: Alexandre Oliva <oliva@adacore.com>
Date:   Tue Jul 5 06:12:27 2022 -0300

    libstdc++: testsuite: cast getpid result
    
    On vxworks, in kernel mode, getpid's return type is a pointer type, so
    std::to_string on it fails overload resolution.  Restore the type cast
    from the original patch that suggested adding the pid.
    
    
    for  libstdc++-v3/ChangeLog
    
            * testsuite/util/testsuite_fs.h (nonexistent_path): Convert
            the getpid result to an integral type.

Diff:
---
 libstdc++-v3/testsuite/util/testsuite_fs.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/testsuite/util/testsuite_fs.h b/libstdc++-v3/testsuite/util/testsuite_fs.h
index 908fcdbcaee..25f8f734dc7 100644
--- a/libstdc++-v3/testsuite/util/testsuite_fs.h
+++ b/libstdc++-v3/testsuite/util/testsuite_fs.h
@@ -163,7 +163,7 @@ namespace __gnu_test
       file.resize(64);
     // The combination of random counter and PID should be unique for a given
     // run of the testsuite.
-    file += std::to_string(::getpid());
+    file += std::to_string((unsigned long) ::getpid());
     p = std::move(file);
     if (test_fs::exists(p))
       throw test_fs::filesystem_error("Failed to generate unique pathname", p,