function.c (thread_prologue_and_epilogue_insns): Do not crash on empty epilogue sequences.

	* function.c (thread_prologue_and_epilogue_insns): Do not crash
	on empty epilogue sequences.

From-SVN: r168463

gcc/ChangeLog

+2011-01-04  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
+
+	* function.c (thread_prologue_and_epilogue_insns): Do not crash
+	on empty epilogue sequences.
+
 2011-01-04  Joseph Myers  <joseph@codesourcery.com>
 
 	* config/vxworks.opt (Bdynamic, Bstatic, Xbind-lazy, Xbind-now,

gcc/function.c

@@ -5461,7 +5461,8 @@ thread_prologue_and_epilogue_insns (void)
       start_sequence ();
       epilogue_end = emit_note (NOTE_INSN_EPILOGUE_BEG);
       seq = gen_epilogue ();
-      emit_jump_insn (seq);
+      if (seq)
+	emit_jump_insn (seq);
 
       /* Retain a map of the epilogue insns.  */
       record_insns (seq, NULL, &epilogue_insn_hash);