Check __GLIBC__ when using __SIGRTMIN

2011-12-14  H.J. Lu  <hongjiu.lu@intel.com>

	* generic-morestack.c (__generic_morestack_set_initial_sp): Check
	__GLIBC__ instead of __linux__ when using __SIGRTMIN.

From-SVN: r182342

libgcc/ChangeLog

+2011-12-14  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* generic-morestack.c (__generic_morestack_set_initial_sp): Check
+	__GLIBC__ instead of __linux__ when using __SIGRTMIN.
+
 2011-12-14  Georg-Johann Lay  <avr@gjlay.de>
 
 	PR target/49313

libgcc/generic-morestack.c

@@ -507,8 +507,8 @@ __generic_morestack_set_initial_sp (void *sp, size_t len)
   sigemptyset (&__morestack_initial_sp.mask);
 
   sigfillset (&__morestack_fullmask);
-#ifdef __linux__
-  /* On Linux, the first two real time signals are used by the NPTL
+#ifdef __GLIBC__
+  /* 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
      importantly, pthread_sigmask uses less stack space on x86_64.  */