8465 aggressive-loop-optimizations error in rt2860.c

@@ -17,10 +17,11 @@
 # information: Portions Copyright [yyyy] [name of copyright owner]
 #
 # CDDL HEADER END
 #
 #
+# Copyright 2017 Gary Mills
 # Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 # Use is subject to license terms.
 #
 
 #

@@ -66,10 +67,19 @@
 
 CERRWARN        += -_gcc=-Wno-unused-label
 CERRWARN        += -_gcc=-Wno-parentheses
 CERRWARN        += -_gcc=-Wno-unused-value
 
+# Prevent the error with gcc-4.9.4: iteration 35u invokes undefined behavior
+GCC_VERS:sh = ${GCC_ROOT}/bin/gcc --version | \
+    head -1 | \
+    sed -e 's/([^(]*)//g' -e 's/^.* //'
+ADD.$(GCC_VERS) = -_gcc=-fno-aggressive-loop-optimizations
+ADD.4.4.4 =
+ADD.3.4.3 =
+$(OBJS_DIR)/rt2860.o := CFLAGS += $(ADD.$(GCC_VERS))
+
 #
 #       Default build targets.
 #
 .KEEP_STATE: