nptl: Add tst-pthread-key1-static for BZ #21777

Add a static pthread static tests to verify that BZ #21777 is fixed.

Reviewed-by: Florian Weimer <fweimer@redhat.com>

nptl/Makefile

@@ -315,6 +315,7 @@ tests = \
   tst-pthread-defaultattr-free \
   tst-pthread-gdb-attach \
   tst-pthread-gdb-attach-static \
+  tst-pthread-key1-static \
   tst-pthread-timedlock-lockloop \
   tst-pthread_exit-nothreads \
   tst-pthread_exit-nothreads-static \
@@ -536,6 +537,7 @@ tests-static += \
   tst-mutex8-static \
   tst-mutexpi8-static \
   tst-pthread-gdb-attach-static \
+  tst-pthread-key1-static \
   tst-pthread_exit-nothreads-static \
   tst-sem11-static \
   tst-sem12-static tst-cond11-static \

nptl/tst-pthread-key1-static.c

@@ -0,0 +1,37 @@
+/* Verify that static pthread executable works.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <pthread.h>
+#include <support/check.h>
+
+pthread_key_t k;
+
+static int
+do_test (void)
+{
+  int rc;
+
+  rc = pthread_key_create (&k, NULL);
+  TEST_VERIFY (rc == 0);
+  rc = pthread_setspecific (k, NULL);
+  TEST_VERIFY (rc == 0);
+
+  return 0;
+}
+
+#include <support/test-driver.c>