Xtensa port: Let xcc specific make file override unsupported -Og with -O0.

Change-Id: If1a1833b5ce09c7112245b8b73c0ccd28be66c88
Signed-off-by: Mazen NEIFER <mazen@nestwave.com>

Makefile

@@ -595,6 +595,12 @@ drivers-y := drivers/
 ARCH = $(subst $(DQUOTE),,$(CONFIG_ARCH))
 export ARCH
 
+ifeq ($(CONFIG_DEBUG),y)
+KBUILD_CFLAGS += -Og
+else
+KBUILD_CFLAGS += -Os
+endif
+
 ifdef ZEPHYR_GCC_VARIANT
 include $(srctree)/scripts/Makefile.toolchain.$(ZEPHYR_GCC_VARIANT)
 else
@@ -632,12 +638,6 @@ KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
                  $(call cc-option,-fno-partial-inlining)
 endif
 
-ifeq ($(CONFIG_DEBUG),y)
-KBUILD_CFLAGS  += -Og
-else
-KBUILD_CFLAGS  += -Os
-endif
-
 ifeq ($(CONFIG_STACK_CANARIES),y)
 KBUILD_CFLAGS += $(call cc-option,-fstack-protector-all,)
 else

scripts/Makefile.toolchain.xcc

@@ -71,6 +71,9 @@ KBUILD_CPPFLAGS += -I$(XTENSA_TOOLS_PATH)/lib/xcc/include \
                    -I${XTENSA_BUILD}/xtensa-elf/include \
                    -D'__builtin_unreachable()=while(1);'
 
+# xt-xcc does not support -Og, replace with -O0
+KBUILD_CFLAGS:=$(patsubst -Og,-O0,${KBUILD_CFLAGS})
+
 # Support for Xtensa simulator from Cadence Design Systems, Inc.
 XTRUN=${CROSS_COMPILE}run
 XTRUN_FLAGS += --cycle_limit=${XTENSA_ISS_CYCLES_LIMIT}