Work around a ppc clang inlining bug

sysdeps/pthread/aio_misc.c

@@ -27,6 +27,9 @@
 #include <sys/param.h>
 #include <sys/stat.h>
 #include <sys/time.h>
+#if defined __clang__ && defined __powerpc64__
+#define UGLY_INLINE_HACK
+#endif
 #include <aio_misc.h>
 
 #ifndef aio_create_helper_thread

sysdeps/unix/sysv/linux/aio_misc.h

@@ -35,7 +35,13 @@ __aio_start_notify_thread (void)
   INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_SETMASK, &ss, NULL, _NSIG / 8);
 }
 
-extern inline int
+extern
+/* clang fails to inline properly in one case, and then linking fails
+   because the function was discarded, so ensure it's kept.  */
+#ifndef UGLY_INLINE_HACK
+inline
+#endif
+int
 __aio_create_helper_thread (pthread_t *threadp, void *(*tf) (void *),
 			    void *arg)
 {