re PR target/52390 (only linux uses nptl)

	PR target/52390
	* generic-morestack.c (__generic_morestack_set_initial_sp): Test
	for __linux__ when removing signals from __morestack_fullmask.

From-SVN: r184606

libgcc/ChangeLog

+2012-02-27  Samuel Thibault  <samuel.thibault@ens-lyon.org>
+
+	PR target/52390
+	* generic-morestack.c (__generic_morestack_set_initial_sp): Test
+	for __linux__ when removing signals from __morestack_fullmask.
+
 2012-02-23  Georg-Johann Lay  <avr@gjlay.de>
 
 	PR target/52261

libgcc/generic-morestack.c

@@ -507,7 +507,7 @@ __generic_morestack_set_initial_sp (void *sp, size_t len)
   sigemptyset (&__morestack_initial_sp.mask);
 
   sigfillset (&__morestack_fullmask);
-#ifdef __GLIBC__
+#if defined(__GLIBC__) && defined(__linux__)
   /* In glibc, the first two real time signals are used by the NPTL
      threading library.  By taking them out of the set of signals, we
      avoiding copying the signal mask in pthread_sigmask.  More